Question

Solve.
a + b = 21
a = 20
b = 15
a = 373
b =-161
a = 12
b = 9
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Answer 1

With a= 20 and b= 15
a+b= 20 + 15 = 35

With a = 373 and b= -161
a+b= 373 + (-161) = 373 - 161 = 121

With a = 12 and b = 9
a+b= 12 + 9 = 21

Answer 2

Answer:

With a= 20 and b= 15

a+b= 20 + 15 = 35

With a = 373 and b= -161

a+b= 373 + (-161) = 373 - 161 = 121

With a = 12 and b = 9

a+b= 12 + 9 = 21

Step-by-step explanation: