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(5)?

a. 28.14
b. 31.40
c. 246.49
d. 78.50

answer: it actually depends on which is the independent variable and which is the dependent variable. let us say we're looking at a linear equation. y=2x+3. we theoretically could switch the equation to be x=(y-3)/2 and it would be the same line. so either a causes b or it can be that b causes a. so technically the answer is false

step-by-step explanation: