The function f(r) gives the area of a circle with radius r. it can be written in equation form as f(r) = 3.14r2. what is f(4)?
a. 50.24
b. 25.12
c. 19.14
d. 157.75

Option 'A' is correct.

Step-by-step explanation:

Since we have given that

the function f(r) givens the area of a circle with radius r.

i.e.

Put the value of r = 4 as we have to find the value of f(4) .

Hence, Option 'A' is correct.

answer: -8.2562234e+13

d. 8

step-by-step explanation:

the given radical expression is:

we can rewrite this as:

we express as square numbers to get;

the exponents will now cancel out to give.

the correct answer is d