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. 31.40
b. 78.50
c. 28.14
d. 246.49

75 tickets have been sold so far.

step-by-step explanation:

in this question it is clearly mentioned that 45 children's tickets have been sold and this number is 60% of the total tickets sold.

now let's assume the total number of tickets sold be x.

then 60% of x = 45

⇒

⇒ x(.6) = 45

by dividing with .6 on both the sides of the equation

⇒ x = 75

therefore 75 tickets have been sold so far.