Answer:
Mary 81
Sandy 30
Step-by-step explanation:
S-3=M/3
multiply by 3
3s-9=m
m=81
3s-9=81
add 9
3s=90
divide by 3
s=30
I think the top and the two in the middle but I can't really see it's a blurry picture
c
7
Interval notation (-5,3]
