Answer:
Melissa
Step-by-step explanation:
Melissa: 18/20
Tom: 85/100
Find the common denomenater so multiply 18*5 and 20*5
Melissa: 95/100
95>85
Melissa has the greater mark
m = -1/2
m = slope = rise/run
rise +1
run -2
rise/run = 1/-2
=
-1/2
x=77
77-31=46