Decide whether the following relation is a function or not. Give a reason for your answer.

$\left\{\right(9,9),(8,7),(7,5),(5,9),(9,5),(6,12\left)\right\}$.

Use the vertical line test to determine whether the following graph is a function or not. Explain your answer.

Decide which of the following relation is a function or not. Give a reason for your answer.

Use the vertical line test to determine whether the following graph is a function or not. Explain your answer.

Use the vertical line test to determine whether the following graph is a function or not. Explain your answer.

A carpenter charges his clients a rate of $€ 30$ an hour, plus a single $€ 40$ fee for each job. Express the relationship between time spent on a job and the fee charged to the client using function notation.

A carpenter charges his clients a rate of $€ 30$ an hour, plus a single $€ 40$ fee for each job. Express the relationship between time spent on a job and the fee charged to the client using function notation.Define the domain and range. Decide what the constraints are on the domain and range based on the real-life context.

A carpenter charges his clients a rate of $€ 30$ an hour, plus a single $€ 40$ fee for each job. Express the relationship between time spent on a job and the fee charged to the client using function notation.Explain how the relation is a function.

A bathtub is filled with $120$ liters of water. The drain plug is pulled and the water empties out at a rate of $25$ liters per minute. Express the relationship between time elapsed since the plug was pulled, and the amount of water in the bathtub using function notation.