Pls limited time. precal 1. if c and d are matrices and c is the inverse of d, which of the following is true? a. c-d=d-c=i b. c+d=d+c=i c. c/d = d/c=i d. cd=dc=i 2. if a and b are matrices and ab = i, which of the following represents the value of b? -1 4 a= -3 8 a. 1/4 1 -3/4 -2 b.-1/4 -1 3/4 2 c.-2 1 -3/4 1/4 d.2 -1 3/4 -1/4

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)