cos(-15°) = _____.

cos 75°
-cos 345°
cos 15°
-cos 15°

Answer:

1/5 as a decimal is written as 0.2

Answer:

This makes you get 0.2So you have the fraction 15 . What the divided sign is, is basically just a division sign. So, to get the decimal, you do 1÷5 .

Step-by-step explanation:

So you have the fraction 15 . What the divided sign is, is basically just a division sign. So, to get the decimal, you do 1÷5 .

Answer:

C.

Step-by-step explanation:

Opposite means that they are the same value away from 0 just on the opposite side.

4 is opposite to -4

and 7 is opposite to -7

Answer:

10 cm

Step-by-step explanation:

We want to find TS = ST

ST = CD  from the second statement of congruence

CD = IJ  from the first statement of congruence

We know IJ = 10

That means ST = 10

Answer:

24/25

Step-by-step explanation:

3/5×8/5

24/25

Answer:

8.6 x 3.14 = 27.00cm (squared) I think. Double check that. But i think ( .00 ) is in the hundredths.

Final answer:

The area of a circle with a radius of 8.6 centimeters is approximately 232.23 square centimeters when calculated using 3.14 for Pi and rounding to the nearest hundredth.

Explanation:

The question is asking to find the area of a circle with a given radius. The formula to calculate the area of a circle is A = πr², where π is a constant (Pi, approximately 3.14) and r is the radius of the circle. To calculate the area with the given radius of 8.6 centimeters:

Insert the radius into the area formula: A = π × (8.6 cm)²

Perform the squaring of the radius: 8.6 cm × 8.6 cm = 73.96 cm²

Multiply the result by Pi (using 3.14 for π): A = 3.14 × 73.96 cm²

Calculate the product: A = 232.23 cm²

Round the result to the nearest hundredth: A ≈ 232.23 cm²

Therefore, the area of the circle is approximately 232.23 square centimeters.

Answer:

[tex]10\pi[/tex]

Step-by-step explanation:

The penguin swam around half of the perimeter, or circumference, of the pool. The first step is to calculate that. You can find the circumference of a circle by multiplying the diameter by pi. Therefore, the circumference of this island is 20pi. Half of that is [tex]10\pi[/tex] meters. Hope this helps!

Answer:

10 meters

Step-by-step explanation:

20 / 2 = 10

Answer:

This means that there is no solution

Step-by-step explanation:

When solving for a system of linear equations, we are solving for the intersection point. If we cannot algebraically solve for a system, it automatically means you made a mistake or the lines are parallel.  Since the two lines are parallel, there is no intersection point, so there is no solution

in geometry a line segment part of a line that is bounded by two distinct endpoints

Answer:

0.75

Step-by-step explanation:

45 is three-fourths of sixty

three fourths as a fraction is .75

hope this helps!!!

Answer:

0.75

Step-by-step explanation:

you divide 45 by 60 and you will get 0.75

Answer:

15

Step-by-step explanation:

Question:

Evaluate the expression 5^x - 3^x for x=2

Answer:

5^x - 3^x for x=2 is 16

Step-by-step explanation:

Given

5^x - 3^x

x=2

Required

Evaluate

When fazed with question like this all you need is to substitute the value of x (or any other variable{s} used) in the expression.

Recall that x = 2

So, you have to substitute 2 for x in 5^x - 3^x

This gives

[tex]5^2 - 3^2[/tex]

This can be further solved in 2 ways

1. Solve directly

[tex]5^2 - 3^2[/tex]

= [tex]25 - 9[/tex]

= 16

2. Expand using difference of two squares.

Difference of two squares is represented by

[tex]a^2 - b^2 = (a + b) (a - b)[/tex]

By comparison

[tex]5^2 - 3^2[/tex] becomes

[tex]5^2 - 3^2 = (5 + 3) (5 - 3)[/tex]

[tex]5^2 - 3^2 = (8) (2)[/tex]

[tex]5^2 - 3^2 = 8 * 2[/tex]

[tex]5^2 - 3^2 = 16[/tex]

For both ways, we'll arrive at the same answer.

Hence, 5^x - 3^x for x=2 is 16

Answer:

5^x - 3^x for x=2 is 16

Step-by-step explanation:

Answer: C

Step-by-step explanation:

I went w/ my trusty C and got it right on e2020

All real values of x where 1 < x < 3. Therefore, option C is the correct answer.

Graph is a mathematical representation of a network and it describes the relationship between lines and points. A graph consists of some points and lines between them. The length of the lines and position of the points do not matter.

The positive regions of a function are those intervals where the function is above the x-axis.

It is where the y-values are positive (not zero).

Therefore, option C is the correct answer.

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"Your question is incomplete, probably the complete question/missing part is:"

Which describes all of the values for which the graph is positive and decreasing?

A.all real values of x where x < −1

B.all real values of x where x < 1

C.all real values of x where 1 < x < 3

D.all real values of x where x > 3

After a series of movements starting on the 10th floor, the elevator stopped on the 13th floor.

To determine which floor the elevator was on when it stopped, we need to perform a series of additions and subtractions based on the elevator's movements, as described:

The elevator started on the 10th floor.

It traveled up 4 floors: 10 + 4 = 14th floor.

Then down 6 floors: 14 - 6 = 8th floor.

Then down 2 more floors: 8 - 2 = 6th floor.

Finally, it went back up 7 floors: 6 + 7 = 13th floor.

After completing all these movements, the elevator stopped on the 13th floor.

Answer:

18,736.80

Step-by-step explanation:

Final answer:

To determine the original purchase price of the van, we apply the formula for exponential decay and find that Ethan paid approximately $10,100.45 for the van two years ago, taking into account a depreciation rate of 11% per year.

Explanation:

To find how much Ethan paid for the van, we need to work backwards from the current value and consider the annual depreciation rate.

To do this, we can use the formula for exponential decay which is final value = initial value × (1 - rate of depreciation)number of years. Given the final value ($8000) and the depreciation rate (11% or 0.11), we need to solve for the initial value, which represents the price Ethan paid for the van.

Let's set up the equation:

8000 = initial value × (1 - 0.11)2

8000 = initial value × (0.89)2

8000 = initial value × 0.7921

Initial value = 8000 / 0.7921

Initial value ≈ $10,100.45

Therefore, Ethan paid approximately $10,100.45 for the van.

Answer:

1099.6 m³

Step-by-step explanation:

The formula for the volume of a cylinder of radius r and height h is

V = πr²h.  In this case, the radius, r, is half the diameter, 10 m:  r = 5 m, and the height is 14 m.  

Thus, the volume of this cylinder is

V = π(5 m)²(14 m) = 1099.6 m³ (to the nearest tenths place).

The volume of the cylinder is approximately 1099.6 cubic meters to the nearest tenth place.

A cylinder is a 3D solid form made up of two bases that are parallel and identical and are connected by a curving surface. These bases resemble spherical disks. The axis of the cylinder form is a line drawn through the center or connecting the centers of two circular bases.

The formula for the volume of a cylinder is:

V = πr²h

where r is the radius of the base of the cylinder, h is the height of the cylinder, and π is the mathematical constant pi (approximately equal to 3.14159).

To find the radius of the cylinder, we need to divide the diameter by 2:

r = d/2 = 10m / 2 = 5m

Now we can plug in the values:

V = πr²h = π(5m)²(14m) = 350π m³

To approximate the value to the nearest tenths place, we can substitute the value of π as 3.14159 and use a calculator to evaluate the expression:

V ≈ 350 × 3.14159 ≈ 1099.56 ≈ 1099.6

Therefore, the volume is 1099.6 cubic meters.

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Answer:

a.) [tex]mean=200.3[/tex]

b.) [tex]210[/tex] [tex]cm[/tex]

Step-by-step explanation:

a.) We are given the heights and their frequency. We can make a new set:

198, 199, 199, 199, 200, 200, 201, 201, 201, 201, 201, 202, 202

Now find the mean. The mean is found by adding all the numbers in the set, then dividing the total by the number of terms in the set. Add:

[tex]198+199+199+199+200+200+201+201+201+201+201+202+202=2604[/tex]

Now count the terms. There are 13 terms. Divide the total by the number of terms:

[tex]\frac{2604}{13}= 200.3[/tex]

The mean is 200.3.

b.) Use random values like 200, 198 etc. and add them to the total of the last set, then divide by 14 instead of 13 (because there is a new player). Do this until you get a mean of 201 with the new height:

[tex]2604+210=2814\\\\\frac{2814}{14}= 201[/tex]

For the new mean to be 201 cm, the new player has a height of 210 cm.

Finito.

To estimate the mean height of students at your college or university with 93 percent confidence and a margin of error of 1 inch, you would need to measure approximately 333 male students.

To estimate the mean height of students at your college or university with 93 percent confidence and a margin of error of 1 inch, you need to use the formula for sample size.

The formula for sample size is:

N = ((Z * σ) / E)^2

Where N is the sample size, Z is the Z-score for the desired confidence level, σ is the standard deviation, and E is the margin of error.

In this case, the Z-score for 93 percent confidence is 1.8119 (found using a Z-table). The standard deviation is given as 2.5 inches. Substituting these values into the formula:

N = ((1.8119 * 2.5) / 1)^2

N = 18.2255^2

N ≈ 332.3782

Rounding up to the nearest whole number, you would need to measure approximately 333 male students to estimate the mean height with 93 percent confidence and a margin of error of 1 inch.

Answer:

10

Step-by-step explanation:

cos60=0.5

cos60= 5/x hence x=5÷cos60(0.5)

=5÷0.5=10

Answer:

(4, -15) is the vertex, a

Step-by-step explanation:

y=x^2-8x+1

-b/2a=x

y = ax^2 + bx + c

a=1 b=-8 c=1

x=8/2(1)

x=8/2

4 is the x of the vertex

y=4^2-8(4)+1

y=16-32+1

y=-15

(4, -15)

Hope this helps! Please mark brainliest :)

Answer: A (4,-15)

Step-by-step explanation:

Answer:

Step-by-step explanation:

The circumference of a regulation basketball hoop with an 18-inch diameter is approximately 56.52 inches.

The question asks for the approximate length around the rim of a regulation basketball hoop, which has an 18-inch diameter. To find the circumference (the length around the rim), we can use the formula:

Circumference =
pi imes diameter

Since the diameter of the rim is 18 inches, we can approximate
pi as 3.14 to calculate the circumference:

Circumference = 3.14 imes 18 inches = 56.52 inches

Thus, the approximate length around the rim of a regulation basketball hoop is about 56.52 inches.

Answer:

42.7 cm sq.

Step-by-step explanation:

small/large = 16 / 122

16/122 = S / 56

S = 56 * (16/122) = 7.34...

however not in the choice

ah ha..

You meant :    12.2 sq. cm :  16 sq. cm  = small / large

so   12.2 / 16 = S / 56 cm

S = 42.7 sq. cm

The surface area of the smaller pyramid is approximately 42.7 cm. Answer: B) 42.7 cm

Area is the entire amount of space occupied by a flat (2-D) surface or an object's form. On a sheet of paper, draw a square using a pencil. It has two dimensions. The area of a form on paper is the area that it occupies.

If two pyramids are similar, their corresponding linear dimensions (height, slant height, etc.) are in the same ratio as their corresponding base dimensions.

Let the height of the larger pyramid be h, and let the height of the smaller pyramid be x, h, where x is the scaling factor.

The ratio of their base areas is given by:

(xh)² : h² = 16 : 122

Simplifying this equation, we get:

x²h² = 16/122 * h²

x² = 16/122

x = √(16/122)

Now we know that the linear dimensions of the smaller pyramid are

1/√(122/16) = √(16/122) times that of the larger pyramid.

So, the surface area of the smaller pyramid is:

(16/122) * (56 / (√(16/122))²) = 42.7 cm (rounded to one decimal place)

Therefore, the surface area of the smaller pyramid is approximately 42.7 cm. Answer: B) 42.7 cm

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Answer:

33

Step-by-step explanation:

just multiply 5*6 and add three to the result

Answer:

33

Step-by-step explanation:

Every hour she makes 5 cards, and she makes them for 6 hours so you need to multiply 6 with 5 to get 30, then add up the 3 she made earlier...33 :D

Answer:

$360.12

Step-by-step explanation:

Phan's net pay would be equal to the gross wage he receives minus the deductions:

Gross wage= $487.12

Federal withholding taxes= $49

Social security taxes= $487.12*6.2%= $30.2

Medicare taxes= $487.12*1.45%= $7.06

Health insurance= $28.74

Union dues= $12

Net pay= $487.12-$49-$30.2-$7.06-$28.74-$12

Net pay= $360.12

According to this, Phan's net pay is $360.12.

Phan's net pay is calculated by subtracting the sum of Social Security tax, Medicare tax, federal withholding, health insurance, and union dues from his gross wages. After performing the calculations, Phan's net pay is $360.12.

To calculate Phan's net pay, we first need to determine the amount of each deduction from his gross wages. We will follow these steps:

Now let's do the math:

To calculate the net pay:

Gross wages = $487.12

Total deductions = $127.00

Net pay = Gross wages - Total deductions

Net pay = $487.12 - $127.00 = $360.12

Therefore, Phan's net pay is $360.12.

Answer:

The profit percentage in MP3 player is 9.37 %.

Step-by-step explanation:

Cost price of MP3 player is $320

Selling price of MP3 player is $350.

Here, selling price is more than cost price. It means there is profit in MP3 player.

Profit = SP - CP

Profit = 350 - 320

Profit = $30

Profit percentage is given by :

[tex]\% P =\dfrac{{SP}-{CP}}{{CP}}\times 100\\\\\% P=\dfrac{30}{{320}}\times 100\\\\\% P=9.37\%[/tex]

The profit percentage in MP3 player is 9.37 %.

Answer:

x^2+x-72=0

Step-by-step explanation:

Hope this helps!

Answer:

x^2+x-72=0

Step-by-step explanation:

Answer:

14 in

Step-by-step explanation:

breadth = 12/4 = 3

perimeter = 3+3+4+4 = 14

Answer:

The only correct options are A, B and E.

Step-by-step explanation:

He buys [tex]1\frac{1}{2}[/tex] pounds of flour, 12 ounces of coconut, and [tex]1\frac{1}{4}[/tex] pounds of sugar.

We will add these together, but before that, we convert the 12 ounces to pounds, so that all the units are the same:

1 ounce = 0.0625 pounds

12 ounces = 12 * 0.0625 = [tex]\frac{3}{4}[/tex] pounds

He buys  [tex]\frac{3}{4}[/tex] pounds of coconut.

Adding all of them together yields:

[tex]1\frac{1}{2}[/tex] + [tex]\frac{3}{4}[/tex] + [tex]1\frac{1}{4}[/tex] = [tex]3\frac{1}{2}[/tex] pounds

Let us also convert to ounces:

[tex]3\frac{1}{2}[/tex]  / 0.0625 = 56 ounces

Let us also convert 1/2 pound to ounces:

1/2 / 0.0625 = 8 ounces

Hence, the total weight of ingredients that Dwayne bought is [tex]3\frac{1}{2}[/tex] pounds or 56 ounces or 3 pounds 8 ounces

Hence, options A, B and E are correct.

The inequality 3+7<13 represents a situation where the sum of three units and seven units is less than thirteen units. While this does not hold true in a strict mathematical sense, it illustrates the notion of inequality.

The inequality 3+7<13 represents a situation where the sum of three units and seven units is less than thirteen units. The numbers could represent any sorts of units, depending on the real-world situation.

For instance, let's consider an example where each unit represents one apple. According to this inequality, if you have three apples and you add seven more apples, the total number of apples you have would be less than thirteen. As you can see, this does not make sense, because 3+7 equals 10, which is not less than 13. Thus, the inequality 3+7<13 does not hold true in this situation.

This example illustrates that the given inequality does not hold true in a mathematical sense because 3 + 7 equals 10, which is not less than 13. However, in a situation where there is a numerical error or logical inconsistency, this inequality could potentially be used.

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Answer: Mike started with 75 cards

Step-by-step explanation:

Hi, to answer this question we have to write an equation:

The number of cards mike started with (x) plus the new cards added (7) must be divided by 2 (since his dog ate half of his collection).

That expression must be equal to the number of cards left (41)

Mathematically speaking:

(x + 7) /2 = 41

Solving for x:

x+7 = 41x2

x+7 = 82

x = 82-7

x = 75 cards

Feel free to ask for more if needed or if you did not understand something.  

Answer:

[tex] df = n-1= 16-1 =15[/tex]

And the significance level is [tex]\alpha=0.05[/tex] and since we are conducting a bilateral test then the critical values are founded with the t distribution with 15 degrees of freedom and we got:

[tex] t_{\alpha/2}= \pm 2.131[/tex]

Step-by-step explanation:

Information given

[tex]\bar X=45[/tex] represent the sample mean

[tex]s=3.65[/tex] represent the sample standard deviation

[tex]n=16[/tex] sample size  

[tex]\mu_o =41[/tex] represent the value that we want to test

[tex]\alpha=0.05[/tex] represent the significance level for the hypothesis test.  

t would represent the statistic

[tex]p_v[/tex] represent the p value

System of hypothesis

We want to determine the true mean is 41 per day, the system of hypothesis would be:  

Null hypothesis:[tex]\mu = 41[/tex]  

Alternative hypothesis:[tex]\mu \neq 41[/tex]  

We need to find the degrees of freedom first:

[tex] df = n-1= 16-1 =15[/tex]

And the significance level is [tex]\alpha=0.05[/tex] and since we are conducting a bilateral test then the critical values are founded with the t distribution with 15 degrees of freedom and we got:

[tex] t_{\alpha/2}= \pm 2.131[/tex]