Answer:
a = 5
Step-by-step explanation:
a +a+4 + 2a-3 = 21
4a +1 =21
4a = 20
a = 5
Answer: M=2n-2
2n-2=0
2n-2+2=0+2
2n=2
Divide both side by 2
n=1
Step-by-step explanation:
Answer:6.437376 Kilometers per Hour
Step-by-step explanation:
V = -5 because you subtract 4 from both sides then divide both sides by -7 and you get -5