Help please. need done quick question screenshots attached

D. The subtraction property of equality was not applied to solve the equation.

Step-by-step explanation:

Step 1: Simplification

Step 2: Addition property of equality

Step 3: Simplification

Step 4: Multiplication property of equality

Step 5: Simplification

The subtraction property of equality was not used here.

Hope this helps! :D

30 units^2

step-by-step explanation:

area is l × w

the length is 3

and the width is 10

3 × 10= 30 units squared

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