Mary = M Chris = C
M = 3C-4
M-3=C+9 --> M=C+12
3C-4=C+12
2C=16
C=8
M=3C-4 --> C=8
M=3(8)-4
M=24-4
M=20
Mary is 20, and Chris is 8
Answer:
18 to 22: 4
23 to 27: 2
28 to 32: 2
33 to 37: 5
do the same thing for the histogram
Answer:
A. 13, 10, 16
Step-by-step explanation:
If three sides of triangle have measures a, b and c, then

Check all options:
A. a=13, b=10, c=16
Thus,

This option is true
B. a=1, b=2, c=3
Then
but
must be greater than c, so
this option is false
C. a=5.2, b=11, c=4.9
Then
but
must be greater than b, so
this option is false
D. a=208, b=9, c=219
Then
but
must be greater than c, so
this option is false
Substitute the value of the variable into the expression and simplify:
Answer:
139