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2 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]2 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]2 years ago

7 0

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

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On a sunny day, cindy notices that her shadow is 21 inches long. if it is 75 inches from the top of her head to the end of the s

Ray Of Light [21]

Cindy is 72 inches long. Imagine it like a right triangle. Her shadow is the base, she is the side, and the distance between her head and the end of the shadow is the diagonal line connecting the two. Use the Pythagorean theorem to find how tall cindy is.

a²+b²=c²        a=21, the length of the shadow
                       b= ? cindy's height
                     c= 75, the distance from her head to the edge of the shadow
21²+ b²=75²
441 +b² = 5625
-441         -441
------         -------
0             5184
b² = 5184
√b² =√5184
b= 72

hope it helps

5 0

3 years ago

Which equation relates the number of triangles in the figure (n) to the perimeter of the figure (p)

WITCHER [35]

Answer:

Option d is correct.

Equation : P=7n+20.

Explanation;

Given the perimeter of each figure is;

Perimeter of triangle is equal to the sum of all the sides of a triangle.

Perimeter of 1 triangle is 21

Perimeter of 2 triangle is 34 and

Perimeter of 3 triangle is 41

Let n be the number of figure and P be the perimeter of the figure;

the only equation which satisfy the given perimeter is;

$P=7n+20$

Check:

for n =1 which means 1 triangle then;

$P =7n+20 = 7 \cdot 1 +20 = 7+20 = 27$

for n = 2 , [ i.e 2 triangle]

$P =7n+20 = 7 \cdot 2 +20 = 14+20 = 34$

and for n =3 [i.e, 3 triangles]

$P =7n+20 = 7 \cdot 3 +20 = 21+20 = 41$

Therefore, the equation P =7n+20 relates the number of triangles in the figure(n) to the perimeter of the figure(P).

3 0

3 years ago

Questions is <br><br>1)what two bodies of water do the coastal lowlands border

Katena32 [7]

Im pretty sure that the answe would be northern plains

3 0

3 years ago

What is the cube of the quotient 24 and 6

Naily [24]

Quotient of 24 and 6 is : $\frac { 24 }{ 6 } =4$

and 4's cube is : ${ 4 }^{ 3 }\quad =\quad 4\cdot 4\cdot 4=64$
The answer is 64

7 0

3 years ago

The sum of two integers is 81.if the product is 1088.what are the integers

arlik [135]

Answer:

(a;b)={(17; 64); (64; 17)}

Step-by-step explanation:

a+b=81 => b=81-a

a*b=1088

a*(81-a)=1088

-a²+81a=1088

a²-81a+1088=0

a²-64a-17a+1088=0

a(a-64)-17(a-64)=0

(a-17)(a-64)=0

=> a=17 and a=64

for a=17 => b=81-17=64

for a=64 => b=81-64=17

(a;b)={(17; 64); (64; 17)}

3 0

3 years ago