Which of the following expressions represents a function?

a.{(1,,-,,-3)}
b. y^2=16-x^2
c.2x^2+y^2=5
d. x=7

The step function g(x) is defined as shown. what is the range of g(x)? ***answer choices in picture.

If olu is twice as old as funmi if the sum of their ages is 60 how old is olu

Abucket of paint has spilled on a tile floor. the paint flow can be expressed with the function p(t) = 6(t), where t represents time in minutes and p represents how far the paint is spreading. the flowing paint is creating a circular pattern on the tile. the area of the pattern can be expressed as a(p) = 3.14(p)^2 part a: find the area of the circle of spilled paint as a function of time, or a[p(t)]. show your work. part b: how large is the area of spilled paint after 8 minutes? you may use 3.14 to approximate pi in this problem.