Represent the following sentence as an algebraic expression, Where “a number " is the letter x. You do not need to simplify,
3 plus four times a number.

4x+3

Step-by-step explanation:

First, you need to take the 4 times a number part, which gives you 4x. Then you know you need to add 3 to that, so you end up with 4x+3

7

step-by-step explanation:

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value