Last month a car dealership sold 50 cars this month 60 cats were sold what is the percent increase in sales

20% increase in sales over 50 cars per month

Step-by-step explanation:

The actual increase was 10 cars.

We compare 10 cars to the original 50 sold, and obtain:

 10 cars

= 1/5 or 0.20

  50 cars

Multiplying either 1/5 or 0.20 by 100%, we get 20%

in simplified version   it would be x ≤-4

step-by-step explanation:

multiply each term in x ≤-4 by -1

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