x+5=20
x=15
42=5m+7
7=m
-3x-7+7x=9
x=4
-5-2m=-7m+15
m=4
Your mother asked you to turn the oven down to 325°F. This is 75°F less than it was. What was the original temperature?
400°F
4x=-60
x=-15
16=-6a+4
-2=a
-5(2+5m)=-110
m=4
8(-3-m)=-36-4m
m=3
A cell phone company charges a monthly fee plus $0.25 for each text message you send. The monthly fee is $30.00. You owe $59.00. How many text messages did you send?
118 text messages
-16=-7+n
-9=n
10+n/4=7
n=-12
154=4n-6(6+7n)
-5=n
-7(a-2)=4a-2(-7+5a)
a=0
Mario spent $23.85 at the bookstore on one book and some magazines. The book cost $12.60 and the magazines cost $2.25 each. How many magazines did Mario buy?
5 magazines
n/11=14
n=154
-5=-n-5
0=n
8(4m-2)+7(1+3m)=-62
m=-1
-2(8-4b)=8b-11
No solution
A yoga studio charges a $36 membership fee and $20.60 per month for 10 classes. A Martial Arts studio charges a $20 membership fee and $22.20 per month for 10 classes. Your friend belongs to the yoga studio the same month you belong to the Martial Arts studio. After how many months is your friend’s total cost the same as your total cost?
10 months
-4/5r=16
r=-20
(a+4)/14=1
a=10
-(-1-2n)-(4+n)=-7
n=-4
-7(v-5)=35-7v
All real numbers
Find the perimeter of the regular polygon.
150 units