Answer:
Step-by-step explanation:
A=1/2bh and do the math. multiply the base (b) by 1/2, then divide the area (A) by the product. the result of the value will be the height of your triangle
If there is 10% of $18 = 18 x 0.9 (1 - 0.1) = $16.20
Therefore the pie costs $16.20
He is saving 18 - 16.20 = $1.80
The sum is 61 for this equation.
Step-by-step explanation:

A= 1
B= -5
C= 10
In order to figure it out, you can think about it like this..