Yes you need to! And you need to be careful not to forgot that when doing your calculations!!
N(1/3)-8=-13 is the correct answer.
Your answer would be <span>30 m²!
: D</span>
total of ages now is 67 + 4 + 4 = 75
S=shelly
M= Michelle
Michelle is 3 yrs younger than Shelly so use S-3
S +M = 75
replace M with S-3 to get:
S +S-3=75
2S=78
s=39
So shelly is 39
Michelle is 3 years younger = 39-3 = 36
900 because 9 is greater than 5 so it rounds to my answer.
