Need help on math question

The area of a rectangle is 15+5y square feet. which of the following expressions could be the length of the sides of the rectangle, in feet a. 5 and 3y b. 5 and 3+y c. 5 and 5+y d. 3 and 5+3y

Abacteria population is tripling every hour. by what factor does the population change in 1/2 hour? select all that apply

Identify the number as a rational or irrational. explain. 127