Markup =35%
Model train cost =100
So 135%=100
1%=100/135
100%=100/35)*100=74.07
Original cost =74.07
D you first plot the point then use the slope to find the next point.
Answer:

Step-by-step explanation:
we know that
The area of the circle is equal to

where
D is the diameter of the circle
Solve for D
That means-----> Isolate the variable D
Multiply both sides by 4 to remove the fraction

Divide both sides by π

square root both sides

Rewrite

Simplify

for question #1 the answer is: x=2, x=-1
question 9: answer is B
question 10: answer B