54 
A right triangle is a shape that looks like half of a square. The height of the triangle is 12, and the base of the triangle is 9. To find the area, use the following formula:
A =

=

=

= 54
Answer:
y=12.73 x=9
Step-by-step explanation:
15h + 80 = 140
If you wanted to solve how many hours he worked:
15h + 80 = 140
15h = 60
h = 4.
Answer:79
Step-by-step explanation:
180-(45+56)=79
Answer: 12:1
Step-by-step explanation: Brian rides his bike 12 miles in 2 hours