What is magma? a. The molten mixture of rock-forming substances, gases, and water from the mantle.. c. Hardened lava on the surface of the Earth. b. Liquid rock that reaches the surface. d. All of the above Please select the best answer from the choices provided A B C D

Answer:

-120 degrees.

Step-by-step explanation:

This triangle has a rotational symmetry of 3  (it repeats its  orientation 3 times as it makes a complete circle around the center),  so the angle of rotation is 360 / 3 = 120 degrees.

As the rotation is counter clockwise  strictly speaking the answer is -120 degrees.

Answer:

its A on egd

Step-by-step explanation:

i just took the test

Answer:

B. 7/18

Step-by-step explanation:

(-1/6)/(-3/7)

= -1/6 * -7/3

= -1*-7/6*3

= 7/18

(pls give brainliest)

For this case we must find the quotient of the following expression:

[tex]\frac {\frac {-1} {6}} {\frac {-3} {7}} =[/tex]

Applying double C we have:

[tex]\frac {-1 * 7} {6 * -3} =[/tex]

We have by law of signs of multiplication that:

[tex]- * + = -[/tex]

So:

[tex]\frac {-7} {- 18} =\\\frac {7} {18}[/tex]

Answer:

Option B

Answer:

  x ≈ 1.8 cm gives the greatest volume

Step-by-step explanation:

After cutting x cm from each corner in each direction, the cardboard can be folded up to make a box that is x cm deep and (12 -2x) by (10 -2x) in length and width. Clearly, values of x are limited to 5 or less, since cutting 5 cm from each side would leave a width of zero. Then the volume is given by ...

  V = x(12 -2x)(10 -2x)

The plot below shows the value of this cubic equation for volume, and identifies the peak as (x, V) ≈ (1.8, 96.8). That is, a cut of 1.8 cm will result in a box of approximate volume 96.8 cm³.

Answer:

The two numbers are .8*160=128 and .85*240=204

Step-by-step explanation:

First sentence:                 x+y=400

Second sentence           .8x+.85y=400-68

Solve y in the first sentence:  y=400-x

Plug first into second:     .8x+.85(400-x)=332

Distribute:                        .8x+.85(400)-.85x=332

Combine like terms:        -.05x+.85(400)=332

Simplify(multiply):              -.05x+      340=332

Subtract 340 on both sides:    -.05x       =332-340

Simplify(subtract):                     -.05x        =-8

Divide both sides by -.05:              x        =-8/-.05

Simplify (division):                           x        = 160

So y=400-x=400-160=240

Answer:

128 and 204. your welcome.

Step-by-step explanation:

Let x = the first number

Let y = the second number

So we can set up two equations:

x+y = 400

.8x + .85y = 400-68

Use substitution:

y = 400 - x

.8x + (.85)*(400-x) = 332

.8x + 340 -.85x = 332

8 = .05x

x = 160

So that makes y = 240

We want the decreased values so:

160*.8 = 128

240*.85 = 204

So the answers are 128 and 204

Step-by-step explanation:

Find the miles per hour. Divide 130 with 2

130/2 = 65

Mrs.Rosso travels 65 miles per hour. She has 7 hours to travel. Multiply 7 with 65:

65 x 7 = 455

455 > 390 ∴ If everything stays constant, Mrs.Rosso will arrive to her destination on time.

~

Answer: yes

Step-by-step explanation:

If she travels at that rate she gets 65 miles per hour. 65 multiplied by 7 is 455, so she will get there before the 7 hours is up.

Answer:

  b = 2√22 ≈ 9.381

Step-by-step explanation:

The Pythagorean theorem tells you ...

  a^2 + b^2 = c^2

Filling in the given numbers, we can solve for b.

  9^2 +b^2 = 13^2

  b^2 = 169 -81 = 88

  b = 2√22 . . . . . . . . take the square root and simplify

Answer:

D.  

1,068 square feet

Step-by-step explanation:

Split the figure into 2 shapes: triangle and rectangle

Area of rectangle = 36 x 25 = 900 ft^2

Area of triangle = 1/2 (39-25)(36-12) = 1/2 (14)(24) = 168 ft^2

Area of the figure PQRSTU = 900 + 168 = 1068 ft^2

Answer

D.  

1,068 square feet

Answer:

D. 1,068

Step-by-step explanation:

Area of rectangle PQRU = 25 x 36 = 900 sq-ft

Consider triangle RST,

Base of triangle = TR = 36 - 12 = 24 feet

Height if triangle = 39 - 25 = 14 feet

Hence area of triangle = [tex]\frac{1}{2}[/tex] x 24 x 14 = 168 sq-ft

Total area = 900 + 168 = 1068 sq-ft

Answer:

4 hours = 4(60)=240min

2 hours = 2(60)=120min

120<=x<=240

f(x)=1.20||x/2||

So your answer is :

F(X)=1.20||x/2||, if 120<= x<= 240

Answer:

The coordinates of A' are (-9,4)

Step-by-step explanation:

we know that

Each point of the original figure and its image are the same distance away from the line of reflection

so

step 1

reflected the point A(3,4) over the line x=2

The distance of the point to the line of reflection is 3-2=1 units

therefore

The coordinate of the reflected point is (2-1,4) ----> (1,4)

step 2

reflected the point (1,4) over the line x=-4

The distance of the point to the line of reflection is 1-(-4)=5 units

therefore

The coordinate of the reflected point is (-4-5,4) ----> (-9,4)

Answer: is c (-9,4) the guy had it right but wrong letter

Step-by-step explanation:

Answer:

Step-by-step explanation:

Part A: 2(L + W) = P

Part B: 2L + 2W = P

Part C: 2(10 + 5) = 30

Part D: 2(10) + 2(5) = 30

Part E: The reason both strategies work is because of the distributive property (attached)

Both Zack and Rachel's methods for computing the perimeter of a rectangle lead to the same formula: Perimeter = 2 * (Length + Width).

To find the perimeter of a rectangle using Zack's method, he first adds the length (L) and the width (W) together, obtaining the sum (L + W). Next, he doubles this sum by multiplying it by 2, giving him the perimeter of the rectangle.

Perimeter (Zack) = 2 * (L + W)

On the other hand, Rachel takes a slightly different approach. She doubles the length (2 * L) and doubles the width (2 * W) separately, getting two new values. Then, she adds these doubled amounts together, resulting in the perimeter of the rectangle.

Perimeter (Rachel) = 2 * L + 2 * W

Let's analyze the two methods and see if they yield the same result.

We can start by simplifying Rachel's method:

Perimeter (Rachel) = 2 * L + 2 * W

= 2 * (L + W)

Now we can see that both Zack and Rachel's methods end up with the same expression: 2 * (L + W). This means that, despite their different approaches, they arrive at the same formula for calculating the perimeter of a rectangle.

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Answer:

65.4% to 74.6%

Step-by-step explanation:

68% is approximately plus minus 1 standard deviations.

sigma=sqrt(n*p*(1-p))=sqrt(100*.7*.3)=4.58

so we're looking at  70+4.6 and 70-4.6.

Answer: [tex](65.4\%,\ 74.6\%)[/tex]

Step-by-step explanation:

Given : Out of 100 students sampled, 70 of them said that they hoped to get married someday.

i.e. Sample size : n= 100 and Sample proportion:[tex]\hat{p}=\dfrac{70}{100}=0.7[/tex]

Using standard normal table for z,

Critical z-value(two-tailed) for 68% confidence = [tex]z_{\alpha/2}=0.9945[/tex]

Now, confidence interval for population proportion:-

[tex]\hat{p}\pm z_{\alpha/2}\sqrt{\dfrac{\hat{p}(1-\hat{p})}{n}}\\\\=0.7\pm(0.9945)\sqrt{\dfrac{(0.7)(0.3)}{100}}\\\\=0.7\pm0.0455737152863\\\\\approx0.7\pm0.046\\\\=(0.7-0.046,\ 0.7+0.046)=(0.654,\ 0.746)\\\\=(65.4\%,\ 74.6\%)[/tex]

Hence, the approximate percentage of the students in the population who hope to get married someday = [tex](65.4\%,\ 74.6\%)[/tex]

ANSWER

[tex]y = 8x - 26 [/tex]

EXPLANATION

The given points are (3,-2) (4,6).

The slope formula is given by:

[tex] m= \frac{y_2-y_1}{x_2-x_1} [/tex]

We use the slope formula to get:

[tex]m = \frac{6 - - 2}{4 - 3} [/tex]

The slope is

[tex]m = 8[/tex]

We use the point-slope formula to get;

[tex]y-y_1=m(x-x_1)[/tex]

[tex]y + 2 = 8(x - 3)[/tex]

We expand to get;

[tex]y = 8x - 24 - 2[/tex]

The slope-intercept form of the equation is:

[tex]y = 8x - 26[/tex]

Answer:

  1.05 g/cm³

Step-by-step explanation:

The mass of the child is ...

  (50 lb)(454 g/lb) = 22,700 g

The volume displaced is ...

  (40 cm)(30 cm)(18 cm) = 21,600 cm³

Then the density of the child is ...

  mass/volume = 22700 g/(21600 cm³) ≈ 1.05 g/cm³

Answer:

1/2

Step-by-step explanation:

The unit fraction for an area (or anything, for that matter) divided into n equal parts is 1/n. For 2 equal parts, it is 1/2.

Combine (or subtract) like terms.

a + b – c + 3a – 2c

4a + b – 3c <-------------------Answer

So, Choice B.

For this case we have the following expression:

[tex](a + b + c) + 3a-2c[/tex]

We eliminate parentheses:

[tex]a + b-c + 3a-2c =[/tex]

We add similar terms:

[tex]a + 3a + b-c-2c =[/tex]

We have that equal signs are added and the same sign is placed, while different signs are subtracted and the sign of the major is placed, then:

[tex]4a + b-3c[/tex]

Answer:

[tex]4a + b-3c[/tex]

Option B

Answer:

  $3930.56

Step-by-step explanation:

The sum of her required payments is ...

  $950 +238 +149 +78 = $1415

In order for that to be 36% of her income, she must have income that matches ...

  1415 = 0.36 × income . . . . . . . to solve, we divide this equation by 0.36

  1415/0.36 = income ≈ 3930.56

Gina's gross monthly income would need to be $3930.56 to get approved.

_____

Comment on this answer

Often the DTI calculation will include the proposed loan payment. If that is the case, we would need to know the amount of the payment on the loan Gina is applying for. That amount would be added to her existing debt before dividing by 0.36.

Answer:

the answer is D

Step-by-step explanation: so you know that he can do 9 topics in 45 minutes. which is 1 topic every 5 minutes when you divide 45/9. if there is 60 minutes in an hour, and he does 1 topic every 5 minutes, he would do 12. hope this helps xd

A teacher can cover 12 topics in a 1-hour period. It is given that the number of topics he can cover is directly proportional to the length of the time he has to review. So, option D is correct.

Two variables are said to be directly proportional if one variable increases/decreases with respect to the increase/decrease in the other variable. They are related to each other by proportionality.

A ∝ B (A and B are two variables)

⇒ A2/A1 = B2/B1

The given variables are 'N - number of topics' and 'T - time period'.

It is given that they are directly proportional to each other.

So, we can write

N ∝ T

⇒ N2/N1 = T2/T1

Given that,

A teacher can cover 9 topics in a single 45-minute period.

So, N1 = 9 topics and T1 = 45 minutes

And T2 = 1 hour

We need to find N2 =?

Thus, from the above equation

N2/N1 = T2/T1

⇒ N2/9 = (1 hour)/45 minute

1 hour = 60 minutes

⇒ N2/9 = (60/45)

⇒ N2 = 9 × 4/3

∴ N2 = 12 topics

So, he can cover 12 topics in 1 hour. Thus, option D is correct.

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Answer:

x=45

Step-by-step explanation:

Since AB is a straight line, it is 180 degrees

AOE + EOF + FOD + DOB = 180

15+x+2x+120-2x = 180

Combine like terms

135 +x = 180

Subtract 135 from each side

135-135 +x = 180 -135

x = 45

To find x, use the concept of similar triangles and set up a proportion. Cross multiply and simplify the equation to solve for x.

To find x, we need to use trigonometry. Given that AB and CD are straight lines and the figures are not to scale, we can use the concept of similar triangles. We need to find the relationship between the corresponding sides of the triangles to find x.

Let's assume that the length of AB is a and the length of CD is b. From the given information, we can form a proportion:

a/b = (a+x)/a

Cross multiplying and simplifying the equation, we get:

a^2 = b(a+x)

Now we can substitute the given values to solve for x.

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[tex]

3 \frac{2}{3} + 2.3 \\

\implies 3 \frac{2}{3} + \frac{23}{10} \\

\implies \frac{11}{3} + \frac{23}{10} \\

\implies \frac{110+69}{30}

\implies \frac{179}{30}[/tex]

For this case we must indicate the value of the following expression:

[tex]3 \frac {2} {3} +2.3[/tex]

We have the following mixed number:

[tex]3 \frac {2} {3} = \frac {3 * 3 + 2} {3} = \frac {9 + 2} {3} = \frac {11} {3} = 3.6667[/tex]

So, we have:

[tex]\frac {11} {3} + \frac {23} {10} = \frac {10 * 11 + 3 * 23} {30} = \frac {110 + 69} {30} = \frac {179} { 30}[/tex]

In mixed number we have:

[tex]5 \frac {29} {30}[/tex]

ANswer:

[tex]5 \frac {29} {30}[/tex]

Answer: [tex]\bold{N=40e^{\bigg(\dfrac{ln2}{3}\bigg)T}}[/tex]

Step-by-step explanation:

The exponential growth formula is:

[tex]A=Pe^{rt}\\\bullet A=final\ amount\\\bullet P=initial\ amount\\\bullet r=rate\ of\ growth\\\bullet t=time[/tex]

NOTE: This problem is asking to use N instead of A and T instead of t

Step 1: find the rate  

[tex]N=Pe^{rT}\\2P=Pe^{r\cdot 3}\quad \leftarrow(Initial\ population\ doubled\ N=2P, T=3\ days)\\2=e^{3r}\quad \qquad \leftarrow (divided\ both\ sides\ by\ P)\\ln\ 2=ln\ e^{3r}\quad \leftarrow(applied\ ln\ to\ both\ sides)\\ln\ 2=3r\quad \qquad \leftarrow (ln\ e\ cancelled\ out)\\\boxed{\dfrac{ln2}{3}=r}\quad \qquad \leftarrow (divided\ both\ sides\ by\ 3)[/tex]

Step 2: input the rate to find N

[tex]N=Pe^{rT}\\\\\bullet P=40\\\\\bullet r=\dfrac{ln2}{3}\\\qquad \implies \qquad \boxed{N=40e^{\bigg(\dfrac{ln2}{3}\bigg)T}}[/tex]

Answer:

[tex]\boxed{N = 40(2)^{\frac{T}{3}}}[/tex]

Step-by-step explanation:

The growth of bacteria is an exponential function. The equation has the general form

[tex]f(x) = ab^{x}[/tex]

Using the variables N and T, we can rewrite the equation as

[tex]N = ab^{T}[/tex]

We have two conditions:

(1) There are 40 bacteria at T = 0

(2) There are 80 bacteria at T = 3.

Insert these values into the equation.

[tex]\begin{array}{rrcll}(1)&40& = & a(b)^{0} & \\(2)&80 & = & a(b)^{3} & \\(3)& a & = & 40 & \text{Simplified (1)}\\ &80 & = & 40(b)^{3} & \text{Substituted (3) into (2)}\\ & b^{3} & = & 2 & \text{Divided each side by 40}\\ & b & = & (2)^{\frac{1}{3}} &\text{Took the cube root of each side}\\\end{array}\\\\\text{Thus, the explicit equation is } N = 40 \left (2^{\frac{1}{3}\right )^{T}}} \text{ or}\\\\\boxed{\mathbf{N = 40(2)^{\frac{T}{3}}}}[/tex]

Answer:

Step-by-step explanation:

you will have to divide them then you will be able to find the missing side

Answer:

(x, y) = (10, 18)

Step-by-step explanation:

In a parallelogram, adjacent angles are supplementary, and opposite angles are congruent.

∠A = ∠D

54 = 3y

18 = y . . . . . divide by 3

___

∠B = ∠C

12x +6 = 6x +66

6x = 60 . . . . . . . . . subtract 6x+6

x = 10 . . . . . divide by 6

The values of x and y are 10 and 18, respectively.

Answer:

240

Step-by-step explanation:

Profit = revenue - cost

p(x) = 3^x - 1.25^x

5 seasons would be x = 5

p(5) = 3^5-1.25^5

p(5) = 239.948

It would be around 240

Answer: The profit after 5 seasons is $239.94.

Step-by-step explanation:

Since we have given that

Revenue function is given by

[tex]t(x)=3^x[/tex]

Cost function is given by

[tex]r(x)=1.25^x[/tex]

So, We need to find the total profit:

As we know the formula for profit:

Profit = Revenue - Cost

[tex]P(x)=t(x)-r(x)\\\\P(x)=3^x-1.25^x[/tex]

We need to evaluate the profit after five seasons:

[tex]P(5)=3^5-1.25^5\\\\P(5)=\$239.94[/tex]

Hence, the profit after 5 seasons is $239.94.

The original price rounded to the nearest cent was; $106.95

Multiplication is the mathematical operation that is used to determine the product of two or more numbers. If an event can occur in m different ways and if following it, a second event can occur in n different ways, then the two events in succession can occur in m × n different ways.

We are given that hat is marked down 45% and its new price is $69.

45% = 0.45

Therefore, we have;

1.00 - 0.45 = 0.55

$69 x 0.55 = 37.95

Then the original price rounded to the nearest cent was;

$69 + 37.95 = $106.95

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Final answer:

To calculate the original price of the hat before a 45% discount resulted in a new price of $69, divide the new price by 0.55. This calculation gives an original price of approximately $125.45, which is the price before the markdown rounded to the nearest cent.

Explanation:

To determine the original price of the hat before the markdown, we start with the new price which is after a 45% reduction. Since 100% - 45% is 55%, the new price represents 55% of the original price. We use the equation new price = (original price) x (percentage after discount) to solve for the original price.

So we have $69 = (original price) x 0.55. To find the original price, we divide the new price by 0.55:

Original price = $69 / 0.55

Calculating this gives us an original price of approximately $125.45. However, we need to round to the nearest cent resulting in $125.45 as the original price of the hat.

Step-by-step explanation:

Let's say S is the number of small boxes and L is the number of large boxes.

There were 6 more small boxes than large boxes, so:

S = L + 6

Each small box weighs 45 pounds, and each large box weighs 70 pounds.  The total weight was 1305 pounds, so:

45S + 70L = 1305

We can now solve the system of equations.  Using substitution:

45(L + 6) + 70L = 1305

45L + 270 + 70L = 1305

115L = 1035

L = 9

S = 9 + 6

S = 15

There are 15 small boxes and 9 large boxes.

We are required to determine the number of small boxes shipped and the number of large boxes shipped.

let

x = number of small boxes shipped

y = number of large boxes shipped

Weight of small boxes = 45 pounds

Weight of large boxes = 70 pounds

Total weight of boxes = 1305 pounds

There were 6 more small boxes shipped than large boxes

x = y + 6 (1)

x = y + 6 (1)45x + 70y = 1305 (2)

substitute x = y + 6 into (2)

45x + 70y = 1305

45(y + 6) + 70y = 1305

45y + 270 + 70y = 1305

45y + 70y = 1305 - 270

115y = 1035

divide both sides by 115

y = 1035 / 115

y = 9

Recall,

x = y + 6

x = 9 + 6

x = 15

Therefore,

the number of small boxes shipped is 15 and the number of large boxes shipped is 9

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Answer: Option C

49°

Step-by-step explanation:

By definition, the cosine of an angle is defined as:

[tex]cos(\theta) = \frac{adjacent}{hypotenuse}[/tex].

The hypotenuse is always the opposite side to the 90 ° angle

The adjacent side is the one that contains the angle theta and the angles of 90 °.

In this case note that:

[tex]adjacent = n = 44\ mm\\\\hypotenuse = p = 67\ mm[/tex]

So:

[tex]cos(\theta) = \frac{44}{67}[/tex]

[tex]\theta = arcos(\frac{44}{67})[/tex]

[tex]\theta =49\°[/tex]

The answer is:

The correct option is:

C. 49°

To calculate the measure of the angle, we can use the following trigonometric relation:

[tex]Cos\theta =\frac{Adjacent}{Hypothenuse}[/tex]

We are given the following information:

[tex]adjacent=n=44mm\\hypothenuse=p=44mm[/tex]

So, substituting and calculating we have:

[tex]Cos(Cos\theta)^{-1} =Cos(\frac{Adjacent}{Hypothenuse})^{-1}\\\\\theta=Cos(\frac{Adjacent}{Hypothenuse})^{-1}\\\\\theta=Cos(\frac{Adjacent}{Hypothenuse})^{-1}[/tex]

[tex]\theta=Cos(\frac{Adjacent}{Hypothenuse})^{-1}=Cos(\frac{44}{67})^{-1}=48.95\°=49\°[/tex]

Hence, the correct option:

C. 49°

Have a nice day!

1. Find how much gas can be obtained: $10 goes into $2.50 4 times, so you can get 4 gallons.

2. Find how much gas is in the car: 1/4 of the maximum 13 gallons is 3.25 gallons, so there is already 3.25 gallons in your car.

3. Find how many gallons you have total: 4 gallons + 3.25 gallons =

7.25 gallons

The total gallons you have in your car after you put $10 worth of gas is 7.25 gallons.

It is required to find out how many total gallons you have in your car after you put $10 worth of gas.

Arithmetic is the branch of mathematics that deals with the study of numbers using various operations on them. Basic operations of math are addition, subtraction, multiplication and division. These operations are denoted by the given symbols.

Given:

Best way to start this is to figure out how much gas you can get for that $10.  

Since gas is $2.50/gallon and you buy $10 worth, that says you'll get 4 gallons of gas ($2.50 * 4 = $10).  Now figure out how many gallons you have left in your car.  If you car holds 13 gallons, 1/4 of that is 3.25 gallons. Add the 3.25 gallons left to the 4 gallons you bought and you get 7.25 gallons in your car.

Therefore, the total gallons you have in your car after you put $10 worth of gas is 7.25 gallons.

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Answer:

B.  6Fx + 6Gy = 6H

    Qx + Ry = S

Step-by-step explanation:

Equivalent equations can be created many ways. One of the simplest is to multiply both sides of the equation by the same number. In the answer above, the first equation has been multiplied by 6. Nothing has been done to the second equation.

_____

Comments on other choices

A: some terms have been multiplied by 6. This changes the equation(s) so they are no longer equivalent to the ones you started with.

B: the correct choice

C: see A.

D: the first equation has been multiplied by 6, so that is equivalent to the original. The second equation has the sign of one of the terms changed, so it is now a different equation.

Answer: B.  6Fx + 6Gy = 6H

                     Qx + Ry = S

Answer:

12

Step-by-step explanation:

For a cube of side length, L

The following formulas apply:

Area = 6L²

Volume = L³

Area / Volume = 6L² ÷ L³ = 6/L

Try L = 12

Area / Volume = 6/12 = 1/2

Hence 12 is the answer.

Answer:

A. lw = (x+6)(x -6); 133 square feet

Step-by-step explanation:

If x is the original length (in feet), when the length is increased by 6 feet, it can be represented by (x+6).

If x is the original width, when it is decreased by 6 feet, it can be represented by (x-6).

The area is the product of length and width, so the new area is ...

lw = (x+6)(x-6)

___

Since the original side is 13 ft, the new length is 13+6 = 19 ft, and the new width is 13-6=7 ft. The area is ...

(19 ft)(7 ft) = 133 ft²

To find the new dimensions of the brick patio, subtract 6 feet from the width and add 6 feet to the length.

To find the new dimensions of Ezra's brick patio, we need to subtract 6 feet from the width and add 6 feet to the length. Let's say the original width of the square brick patio is x feet. The new width would be (x - 6) feet. Similarly, if the original length is y feet, the new length would be (y + 6) feet. Therefore, the new dimensions of the patio would be (x - 6) feet by (y + 6) feet.

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