Answer
21
Work Step by Step
3x7=21 , and negative times negative mark equals to positive mark , so (-3 )x( -7 ) should be 21
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 4 - An Introduction to Functions - 4-5 Writing a Function Rule - Practice and Problem-Solving Exercises - Page 267: 50
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