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

He amount of carbon-14 present in animal bones t years after the animal's death is given by p(t)equals=upper p 0 e superscript negative 0.00012097 tp0e−0.00012097t. how old is an ivory tusk that has lost 26% of its carbon-14?

Asalesperson earns $320 per week plus 8% of her weekly sales. the expression representing her earnings is 320 + 0.08x. which of the following describes the sales necessary for the salesperson to earn at least $1000 in the one week?

Which property was used to simplify the expression? 3c+9 +4c=3c+4c+9