in order to solve he following system of equations by subtraction, which of the following could you do before subtracting the equations so that one variable will be eliminated when you subtract them? 4x-2y=7, 3x-3y=15

Answer:

yes, 6

Step-by-step explanation:

The given sequence is −34, −28, −22, −16, . . .

We check to see if there is a constant difference among the terms.

[tex]d=-28--34=-22--28=-16--22=6[/tex]

Since there is a constant difference of 6 among the consecutive terms, the sequence is arithmetic.

The correct choice is yes, 6

Answer:

169 : 289

Step-by-step explanation:

Since the figures are similar then

linear ratio of sides = a : b, then

ratio of areas = a² : b²

ratio of sides = 52 : 68 = 13 : 17

ratio of areas = 13² : 17² = 169 : 289

Answer:

True

Step-by-step explanation:

we know that

sin(-360°)=sin(360°)=0

therefore

y=sin(-360°)=0

Answer:

First option: True.

Step-by-step explanation:

To know if the volume of this cylinder is 496.21 ft³, you need to use the formula for calculate the volume of a cylinder:

[tex]V=\pi r^2h[/tex]

Where "r" is the radius and "h" is the height.

You can observe in the figure that the radius of the cylinder is 4.5 feet and the height is 7.8 feet.

Then, knowing this, you can substitute these values into the formula.

Therefore, the volume of this cylinder is:

[tex]V=\pi (4.5ft)^2(7.8ft)\\V=496.21ft^3[/tex]

Then the answer is: True.

Answer:

Step-by-step explanation:

The first and fourth answer choices are the correct one:  $2.20/0.65 lb, $2.20 for 0.65 lb of almonds.

Answer:

i) True

ii) Not True

iii) Cannot be Determined

iv) True

Step-by-step explanation:

From the given graph, we infer the following information.

Cost of 0.65 Almonds is $2.2

Therefore,

i) The price per one pound of almonds equals [tex]\frac{2.20}{0.65lb}[/tex]---TRUE

ii) 2.2 pounds of almonds cost $0.65 ---------> Not True.

iii) Each bag of almonds weighs 2.2 pounds -----> Cannot be Determined (Because we don't have any information about bag)

iv) 0.65 pound of almonds costs $2.20 -----------> True

Answer:

-18

Step-by-step explanation:

A geometric sequence has a common ratio.  So the second term divided by the first term is the same as the third term divided by the second.

6 / -2 = -3

x / 6 = -3

x = -18

Answer: OPTION C

Step-by-step explanation:

Remember that:

[tex]\sqrt[n]{a^n}=a[/tex]

And the Product of powers property establishes that:

[tex]a^m*a^n=a^{(mn)}[/tex]

Rewrite the expression:

[tex]\frac{\sqrt{18x} }{\sqrt{32} }[/tex]

Descompose 18 and 32 into their prime factors:

[tex]18=2*3*3=2*3^2\\32=2*2*2*2*2=2^5=2^4*2[/tex]

Substitute into the expression, then:

[tex]\frac{\sqrt{(2*3^2)x} }{\sqrt{2^4*2} }[/tex]

Finally,simplifying, you get:

[tex]\frac{3\sqrt{(2)x} }{2^2\sqrt{2} }=\frac{3\sqrt{2x}}{4\sqrt{2}}=\frac{(3)(\sqrt{x})(\sqrt{2})}{(4)(\sqrt{2})}= \frac{3\sqrt{x}}{4}[/tex]

Answer:

14 feet below. the deck.

Step-by-step explanation:

That would be (20 + 78 - 85 +103 - 110 )  feet above the ground

= 6 feet above the ground.

That is 20 - 6 = 14 feet below the deck.

Answer:

a) 4 - [tex]vt - d = \frac{1}{2} at^{2}[/tex]

b) 1 - [tex]2(vt - d) = at^{2}[/tex]

c) 6 - [tex]\frac{2(vt - d)}{t^{2}} = a[/tex]

Step-by-step explanation:

It simply asks the steps to go from the original displacement formula to isolate a (the acceleration).  It's just a matter of moving items around.

We start with:

[tex]d = vt - \frac{1}{2} at^{2}[/tex]

We then move the vt part on the left side, then multiply each side by -1 (to get rid of the negative on the at side and to match answer choice #4):

[tex]vt - d = \frac{1}{2} at^{2}[/tex]

Then we multiply each side by 2 to get rid of the 1/2, answer #1:

[tex]2(vt - d) = at^{2}[/tex]

Finally, we divide each side by t^2 to isolate a (answer #6):

[tex]\frac{2(vt - d)}{t^{2}} = a[/tex]

He would have played the cello for 7 hours and 30 minutes because 4 hours would be 6 hours of the cello and then he only did one more hour so you split 3 in half and that makes it an hour and a half. So the answer is 7 hours 30 minutes

Given that the ratio of piano practice to cello practice for Chase is 2:3, if he practiced the piano for 5 hours, he would have practiced the cello for 7.5 hours.

To find out how many hours Chase spent practicing the cello, we first need to assess the ratio of piano to cello practice. The problem tells us that for every 2 hours practicing the piano, Chase spends 3 hours practicing the cello. So, the ratio of piano to cello practice is 2:3.

If he practiced the piano for 5 hours, the equivalent time spent practicing the cello can be found by setting up a proportion like: (2 hours piano / 3 hours cello) = (5 hours piano / x hours cello), where x is the number of cello practicing hours. Solving this proportion for x gives us x = (5 * 3) / 2 = 7.5 hours.

An interpretation of this result is that for every hour Chase spends practicing the piano, he spends 1.5 hours practicing the cello. Therefore, Chase spent 7.5 hours practicing the cello last week, given that he practiced the piano for 5 hours.

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Answer:

range= 20   median= 38   lower quartile and upper quartile= 29 and 42.5

interquartile range= 13.5

Step-by-step explanation:

range= you take the biggest number and subract it from the smallest number.

median= you set the numbers to smallest to biggest then go in from the left and right moving both fingures at once till you get to the middle.

Lower quartile= exclude the medain and average the 4 numbers

Upper quartile= exclude the medain and average the 4 numbers

interquartile range= subract 29 from 42.5

range (i think)

Answer:

100.

Step-by-step explanation:

The percentage of children's watches = 100 - 20 - 40 = 100-60

= 40%.

40% = 0.40 as a decimal fraction.

So the number of children's watches

= 0.40 * 250

= 100.

Answer:

(x - 5)² + (y + 3)² = 16

Step-by-step explanation:

The equation of a circle in standard form is

(x - h)² + (y - k)² = r²

where (h, k) are the coordinates of the centre and r is the radius

here (h, k) = (5, - 3) and r = 4, thus

(x - 5)² + (y - (- 3))² = 4², that is

(x - 5)² + (y + 3)² = 16 ← equation of circle

Answer:

Choice A is the correct answer

Step-by-step explanation:

[tex]2x\sqrt{2x}[/tex]

Find the attachment below for the explanation

For this case we must indicate an expression equivalent to:

[tex]\sqrt {18x ^ 3} - \sqrt {9x ^ 3} +3 \sqrt {x ^ 3} - \sqrt {2x ^ 3}[/tex]

So, rewriting the terms within the roots we have:

[tex]18x ^ 3 = (3x) ^ 2 * (2x)\\9x ^ 3 = (3x) ^ 2 * (x)\\x ^ 3 = x ^ 2 * x\\2x ^ 3 = (2x) * x ^ 2[/tex]

So:

[tex]\sqrt {(3x) ^ 2 * (2x)} - \sqrt {(3x) ^ 2 * (x)} + 3 \sqrt {x ^ 2 * x} - \sqrt {(2x) * x ^ 2} =[/tex]

Removing the terms of the radical:

[tex]3x \sqrt {2x} -3x \sqrt {x} + 3x \sqrt {x} -x \sqrt {2x} =[/tex]

We simplify adding terms:

[tex]3x \sqrt {2x} -x \sqrt {2x} -3x \sqrt {x} + 3x \sqrt {x} =\\2x \sqrt {2x} + 0 =\\2x \sqrt {2x}[/tex]

Answer:

Option A

Answer:

The maximum number of rides is 5

Step-by-step explanation:

Let

x----> the number of rides

we know that

The inequality that represent this situation is

[tex]2.75x\leq 15[/tex]

Solve for x

Divide by 2.75 both sides

[tex]x\leq 15/2.75[/tex]

[tex]x\leq 5.45[/tex]

Round down

The maximum number of rides is 5

Answer:

The maximum number of rides is 5

answer is 5 i took the test

Answer:

144 π  or 452.4 sq inches, for each dot

Step-by-step explanation:

We are given the perimeter of the circle (24π), and we are asked to find the area of the circle basically.

The Circumference of a circle is given by C = 2 * π * r

while its area is given by A = π r²

So, having the circumference, we can isolate r to use it in the area calculation.

C = 2  * π * r

24π = 2 * π * r  (now dividing both sides by 2π)

12 = r

The radius is 12 inches.

That means the area of one dot is:

A = π r² = π 12² = 144 π sq inches

The amount of blue glass needed for each dot is 144 π  or 452.4 sq inches

Answer: 144

Step-by-step explanation:

The greatest common factor of 8m^3 and 6m^4 is 2m^3. This is found by determining the highest number or term that can divide both terms exactly, considering both the coefficients and the power of the variable.

The question asks for the greatest common factor of the terms 8m3 and 6m4. The greatest common factor (GCF) is the highest number or term that divides both numbers exactly. Ignoring the coefficients (8 and 6), we can easily see that these terms both contain the variable 'm', raised to the powers 3 and 4, respectively.

The rule for dealing with variables when finding the GCF is to take the variable to the power which is the lesser of the two. In this case, that would be m3. Now, looking at the coefficients (8 and 6), the highest number that can divide them both exactly is 2. Therefore, the greatest common factor of 8m3 and 6m4 is 2m3.

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The greatest common factor of 8m³ and 6m⁴ is 2m³, which is found by identifying the shared prime factors and the lowest power of 'm' present in both terms.

To find the greatest common factor (GCF) of 8m³ and 6m³, we need to find the highest power of each prime number and the variable that is contained in both terms. The prime factorization of 8 is 23, and for 6, it is 2 × 3. Since both have at least one factor of 2, we'll use that in our GCF. Additionally, since the lowest power of 'm' that appears in both terms is m3, we will also use that.

The GCF is the product of these shared factors. So, we have:

2 (the common prime factor)

m3 (the lowest power of 'm' in both terms)

Therefore, the GCF of 8m³ and 6m⁴ is 2m³.

Answer:

335.5 sq ft.

Step-by-step explanation:

Let's start with the 2 straight 10-feet long walls, it's easier.

Each of those two wall sections are 10 feet long by 9 feet high...  They're rectangles, so their area is their base (10) by their height (9).

Wall 1 = 10 x 9 = 90 sq ft

Wall 2 = 10 x 9 = 90 sq ft

Now the half-circle portion.

The trick here is to calculate half of the circumference. The circumference of a circle is given by C = 2 π r, but we only want half of it... so C/2 = π r

We have the radius (r = 5.5 ft).

So, the half circle has a (half) perimeter of: 5.5 π r = 17.28 ft

Then we multiply this by the height of 9 feet: 17.28 = 155.52 sq ft

Then we add the two other walls:

Total area = 90 + 90 + 155.52 = 335.52, which we round down to 335.5 sq ft.

You can use the Pythagorean theorem to solve.

Distance = √(650^2 + 150^2)

Distance = √(422500 + 22500)

Distance = √(445000)

Distance = 667.08 miles

Rounded to the nearest whole mile = 667 miles.

The calculated distance is approximately 667.08 miles.

Calculating the Distance of the Eagle from Its Nest

To determine the distance of the eagle from its nest after flying 650 miles east and 150 miles south, we can use the Pythagorean theorem, which is applicable for right-angled triangles.

The eagle's eastward flight of 650 miles and southward flight of 150 miles form the two perpendicular sides of a right triangle, while the hypotenuse represents the straight-line distance from the nest.

The formula for the Pythagorean theorem is:

a² + b² = c²

Where:
a = 650 miles
b = 150 miles
c = the distance from the nest

Therefore, the distance of the eagle from his nest is approximately 667.08 miles.

Answer:

x = 2

Step-by-step explanation:

2 + 4x = 10

4x = 10 - 2

x = 8

x = 8 ÷ 4

x = 2

Answer:

Option 'B'

Step-by-step explanation:

The law of cosines states that given a triangle with sides a, b, c, then:

[tex]c^{2} =a^{2}+b^{2} -2abcos(y)[/tex] where 'y' is the opposite angle to the side 'c'.

In this case, given that the equation is: [tex]15^{2} =8^{2} + 17^{2} -2(8)(17)cos(y)[/tex] we can clearly see that c=15, and the opposite angle to 'c' is 62 degrees.

The correct option is Option 'B'

ANSWER

B. 62°

EXPLANATION

The cosine rule is given by:

[tex] {b}^{2} + {c}^{2} - 2(bc) \cos(A) = {a}^{2} [/tex]

where A is the angle that is direct opposite to the side length which is 'a' units.

The given relation is:

[tex]8^{2} + {17}^{2} - 2(8)(17) \cos( - ) = {15}^{2}[/tex]

The missing angle should be the angle directly opposite to the side length measuring 15 units.

From the diagram the missing angle is 62°

The coat will cost $54

Answer:

D

Step-by-step explanation:

There are 4 colors to choose from, so use numbers 1-4 to represent each color.

There are 25 marbles: (12 red, 7 yellow, 5 blue, 1 white)

The probability of the first marble being red is 12/25 because there are 12 red marbles still available and no marbles are missing

The probability of the second marble being red is 11/24 because only 11 red marbles are available and 1 marble has already been selected from the pile

The probability of the third marble being red is 10/23 because only 10 red marbles are available and 2 marbles have already been selected from the pile

The probability of the fourth marble being red is 9/22 because only 9 red marbles are available and 3 marbles have already been selected from the pile

Since we are interested in all of these events occurring simultaneously, we must multiply the probability of all 4 events, like so:

[tex] \frac{12}{25} \times \frac{11}{24} \times \frac{10}{23} \times \frac{9}{22} [/tex]

Solving for this we are left with:

[tex] \frac{9}{230} \: \: or \: \: 0.0391[/tex]

Answer:

A) The angles are 30-60-90. The longest leg (hypotenuse) of the triangle is twice the shortest leg. The middle leg is the shortest leg times the square root of 3.

Step-by-step explanation:

The answer choice speaks for itself.

The legs of a 45-45-90 triangle have the ratios 1 : 1 : √2.

The legs of a 30-60-90 triangle have the ratios 1 : √3 : 2.

Clearly, the given leg lengths match the second set of ratios more closely:

10 : 17.32 : 20 ≈ 1 : √3 : 2.

Answer:

11

Step-by-step explanation:

There is a rather simple method to this.

The factor given is ( x - 2 ) and the dividend is ( 2x⁵ - 7x³ - x² + 4x - 1)

To find the remainder, we will take it as x - 2 = 0

We will get x as 2

Now, substitute the value.

2 ( 2 )⁵ - 7 ( 2 )³ - ( x )² + 4 ( 2 ) - 1

2 ( 32 ) - 7 ( 8 ) - ( 4 ) + 8 - 1

64 - 56 - 4 + 8 - 1

8 - 4 + 8 - 1

16 - 4 - 1

16 - 5

11

Hence, the remainder is 11.

Answer:

50.8%

Step-by-step explanation:

That is the one my friend and I chose. It is 31/61 when all the stuff is added together and that is put to 50.8 as a percentage..

Answer:

[tex]\frac{4}{5}[/tex]

Step-by-step explanation:

Using the Pythagorean identity

sin²x + cos²x = 1, then

sin²x = 1 - cos²x

sinx = [tex]\sqrt{1-cos^2x}[/tex]

note that cosΘ = [tex]\frac{6}{10}[/tex] = [tex]\frac{3}{5}[/tex]

sinΘ = [tex]\sqrt{1-(3/5)^2}[/tex]

        = [tex]\sqrt{1-\frac{9}{25} }[/tex]

        = [tex]\sqrt{\frac{16}{25} }[/tex] = [tex]\frac{4}{5}[/tex]

Answer:

270

Step-by-step explanation:

The mean is 228 and the standard deviation is 18.

2.3 standard deviations above the mean is:

228 + 2.3×18

228 + 41.4

269.4

Since scores are usually integers, we round up to 270.

Final answer:

The price of a CD that sells for 21% more than the amount (m) needed to manufacture the CD is 2/5m.

Explanation:

The price of a CD that sells for 21% more than the amount (m) needed to manufacture the CD can be calculated as follows:

Therefore, the correct answer is D. 2/5m.