Answer:
$15
Step-by-step explanation:
If one pound of beef costs 5 dollars then three would be 3 x 5 which is 15.
Answer:

Step-by-step explanation:
The given expression is

The numerator is a quadratic trinomial and the denominator is different of two squares when 6 is factored.
We factor both the numerator and the denominator to obtain;

Cancel out the common factors to get:

This is the simplest form since, we cannot simplify this further.
The upper left and bottom right are functions.
Remember a function has to pass the vertical line test. Elements from the domain cannot repeat, but elements from the range can.