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3 years ago

1. 15% of 20 is _____.

Mathematics

1 answer:

stealth61 [152]3 years ago

3 0

The answers are:

1. A) 3

2. A) 24.5

3. C) 180

In order to find this, we need to multiply the first two together.

15% * 20

.15 * 20

35% * 70

.35 * 70

The last problem is a little different. Since the decimal comes second, you need to divide instead of multiply.

90/50%

90/.50

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The diameter of a circle is 4 ft. Find its area in terms of \piπ.

Ivanshal [37]

Answer:

4pi

Step-by-step explanation:

area of a circle is pi*r^2

and you have diameter of 4

so 4/2 gives radius which is 2

A = pi*2^2 = 4pi

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3 years ago

Read 2 more answers

For which intervals is the function decreasing?

lilavasa [31]

Answer:

The function is decreasing in the following intervals

A. (0, 1)

C. (2, pi)

Step-by-step explanation:

To answer this question, imagine that you draw lines of slope m parallel to the function shown at each point.

-If the slope of this line parallel to the function is negative for those points then the function is decreasing.

-If the slope of this line parallel to the function is positive for those points then the function is increasing.

Observe in the lines drawn in the attached image. You can see that they have slope less than zero in the following interval:

(0, 1) U (2, pi)

Therefore the correct option is:

A. (0, 1)

C. (2, pi)

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4 years ago

When building a house, the number of days required to build varies inversely with with the number of workers. One house was buil

Helga [31]

Let d represent number of days and n represent number of workers.

We have been given that when building a house, the number of days required to build varies inversely with with the number of workers.

We know that the equation $y=\frac{k}{x}$ represents the relation where y is inversely proportional to x and k is the constant of proportionality.

So our required equation would be $d=\frac{k}{n}$

Upon substituting our given values, we will get:

$19=\frac{k}{35}$

$k=19\cdot 35$

$k=665$

Since constant of proportionality is 665, so our equation would be $d=\frac{665}{n}$ .

To find the number of days it will take to build a similar house with 5 workers, we will substitute $n=5$ in our equation as:

$d=\frac{665}{5}$

$d=133$

Therefore, it will take 133 days for 5 workers to build a similar house.

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3 years ago

Solve the simultaneous equation 2x + y= 6

vivado [14]

Answer:

x=1 y=4

Step-by-step explanation:

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3 years ago

What is the significance of a correlation coefficient of 0.88?

AleksandrR [38]

The maximum positive value that the correlation coefficient can have is 1.
Thus, 0.88 is pretty close, indicating a positive slope for the regression line and points lying close to that line.

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3 years ago