Answer:
21
Step-by-step explanation:
Since there are 7 days in a week, we'll multiply 3 by 7, resulting in an answer of: 21.
a real number
Step-by-step explanation: You didn't list the choices- a real number is all positive numbers except 0
7x7 = 49
8x8=64
9x9=81
10x10=100
Does the answer help you?