A master painter can paint 110 square yards of surface area with a roller in 1 hour, while his apprentice [a person who is learning] can paint 85 square feet of surface area per hour with a brush. The master painter asked his apprentice to paint a surface area of 5,100 square feet. The apprentice paints for 5.5 hours. After 5.5 hours, how many square feet does the apprentice have left to paint?

15

step-by-step explanation:

we are given the following expression and we are to solve it and find the product:

-13 × (-5)

solving the given expression in the standard order of solving a mathematical expression, beginning with the opening of brackets and then multiplying the terms and changing their signs.

-3 × -5 = 15 (answer is positive because when negative is multiplied with negative, it gives a positive answer)

step-by-step explanation: