Adrienne answered all 21 multiple choice questions correctly on her science test, if her teacher decides to let one of the questions count as a bonus, with the same number of points as the other problems on the test, what was adrienne's score write your answer as a decimal and as a percent.

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)