Lacey, because you have to do the opposite when you want to get rid of a number. She subtracted 20 because it was originally positive 20. Chris messed up and did not do the opposite, subtraction, and instead he added 20
Add 21 to both sides: 70n=98
Divide each side by 70: n=98/70
Reduce the fraction: n=7/5
It is 2.226 X 10(Exponent is 11)
Answer:
What do you want me to do? It is already solved
Step-by-step explanation:
1,3,4 just match the markings.