It’s going to be B. 50+60+70=180 which is how many degrees are in a triangle.
Answer:

Step-by-step explanation:
So, for 60 square feet they charge = 287
So, for 1 square foot they charge = 
If they charge the installation fee this becomes = 
We can write an equation to calculate cost by using this 
Where x is the amount of square foot
Answer: 41
Explanation: Use the equation. If you put the x value, which is 5, into the equation, you can solve.
4(5)+21
4 x 5 is 20
20+21=41
hope this helps!!
Answer:
Perpendicular...They have opposite slopes
Step-by-step explanation:
Answer:
X^2+5x-50
Step-by-step explanation:
X^2-5x+10x-50