1) it takes a baker 1/9 of an hour to make enough cookies to fill 1/4 of a large box. how long would it take him to fill the whole box? 2) a cookie recipe called for 2 1/3 cup is sugar for every 1/4 cup of flour. if you made a batch of cookies using one cup of flour, how many cups of sugar would you need?

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)