Math

simplify: (3r² + 7r + 1) + (4r² - 8r - 2)

a. 7r² + 15r - 1
b. 7r² - r - 1
c. 7r² - 15r - 3
d. -r² - r - 1

Charles is on a 8 1/2 mile bike ride. he stops for a rest after he’s gone 5 2/5 miles. how much farther does he still have to go?

Select all the expressions that will include a remainder.

The area of a rectangle is 10 cm^2. one side of the rectangle is x cm. express the perimeter of the rectangle in terms of x and show that this rectangle cannot have a perimeter of 12 cm. the perimeter of the rectangle in terms of x is __ cm