The function g(x) = 4x + 15 represents the cost to rent x movies each month from an online company. What is g(4)

Question

im trying to find g(4)

Answer 1

Good morning, Brook. These kinds of problems confused me at first, too. All we are doing is taking what's inside the parentheses and repacing x with it.

 

g(x) = 4x + 15

 

Remember that 4x means 4(x), or long hand x + x + x + x.

 

g(4) = 4(4) + 15

g(4) = 16 + 15

g(4) = 31

 

Now, it doesn't ask for this, but remember that g(x) is the same thing as saying y. If we put 4 in for x, like we just did, y = 31, so our resulting point on the graph is (4,31).

 

g(6) = 4(6) + 15

g(6) = 24 + 15

g(6) = 39

(6,39)

 

Hope this helps!