If f(x) = _x_2 – 5 for all values x and f(a) = 4, what is one possible value of a?

An outpost has the supplies to last 2 people for 14 days. How many days will the supplies last for 7 people?

The cost of a cell phone plan is $40 for the first 100 minutes of calls, and then 5 cents for each minute after. If the variable x is equal to the number of minutes used for calls in a month on that cell phone plan, what is the equation f(x) for the cost, in dollars, of the cell phone plan for calls during that month?

Let and be functions such that , and . Which of the following is equal to ?

f(x) = 4x + 2

g(x) = 3x - 1

The two equations above define the functions f(x) = g(x). If f(d) = 2g(d) for some value of d, then what is the value of d?

Let the function f be defined by f(x)=x-t. If f(12)=4, what is the value of f(0.5*t)?

The function f, where f(x) = x2 + 6x + 8, is related to function g, where g(x) = 5 f(x-2). What is g(3)?

The rate of a gym membership costs p dollars the first month and m dollars per month every month thereafter. Which of the following represents the total cost of the gym membership for n months, if n is a positive integer?

The point is one of the points of intersection of the graphs of and . Given that and , find the value of .