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3 years ago

11

A(r) is a function that gives the area of a circle with radius r. it can be written in equation form as A(r)=3.14r^2. what is th

e value of A(4)

2 answers:

AleksAgata [21]3 years ago

7 0

$\pi$ r^2 = area
r = 4, $\pi$ * 4^2 = 16<span> $\pi$
Area = 50.24 (2 d.p.)</span>

Mars2501 [29]3 years ago

7 0

50.25 GOD BLESS YALL that's the answer I am pretty sure

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The Census Bureau estimates that in 2020, 15 of the 50 states will have a Spanish-speaking majority. What percent of the states

Vinvika [58]

The answer is: [C]: "30%" .
_____________________________________________________
Explanation:
_____________________________________________________
Note that: "%" ; or "percent" means "out of 100" ; or "divided by 100" .
______________________________________________________
Method 1)

15/50 = ?/ 100 ;

Look at the denominators:

50 * (what value?) = 100 ? ; → "100 ÷ 50 = 2" ;

→ 50 * 2 = 100 ;

So: "15/50 = (15*2)/(50*2) = "30/100" ; which is "30%" .
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Method 2:
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"15/50" = (15÷5) / (50÷5) = 3/10 ;

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Method 3: (slight variation of "Method 2" above):
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4 0

4 years ago

the strength of students in a school when increased by 8% becomes 2160. find the original strength of students in the school.

Leni [432]

Answer:

1987.2

Step-by-step explanation:

We can write a proportion to find the total amount in the choir using the information given. A proportion is two equivalent ratios set equal to each other. Since we know the strength of students increased by 8% to 2160 then the original was 92%.

$\frac{92}{100}=\frac{y}{2160}$

We will cross multiply the numerator of one ratio with denominator of the other. And then solve for y.

92(2160)=100(y)

198720=100y

y=1987.2

There are 1987.2 as the original strength of students.

6 0

3 years ago

Look at the line graphed below. Write an equation of a different line that has the same y- Entercept as the line shown, but has

AlekseyPX

Supposing the line graphed is y = 2x + 3, the equation of the different line is:

y = 4x + 3.

<h3>What is a linear function?</h3>

A linear function is modeled by:

$y = mx + b$

In which:

m is the slope, which is the rate of change, that is, by how much y changes when x changes by 1.

b is the y-intercept, which is the value of y when x = 0.

In this problem, the equation is:

y = 2x + 3

Hence, the slope is 2 and the y-intercept is 3. For the new line, we want to:

Double the slope, hence m = 4.

Keep the same y-intercept, hence b = 3.

Then, the equation of the different line is:

y = 4x + 3.

You can learn more about the equation of a line at brainly.com/question/24685547

8 0

3 years ago