He formula for the surface area of a sphere is a = 4πr2. which equation correctly solves the equation for r? a) r = 4πa b) r = a 4π c) r = a 4π d) r = a 4π

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)

here is the

mark brainliest pl