Question 5403
In this equation C=$$ and x=Number of cookies baked
C(x)= 10x + 25 

a.  Put in 20 for the x value:

C(20)=10(20)+25 = 200+25=225 units of thousand of dollars or $225,000

B. The average cost will be Total cost/number of batches:
$225/20 = $11.25 per batch
C. If the total cost incurred is $575,000 or 575 units of thousands of dollars
C(x)=575
575=10x+25
Subtract 25 from both sides:
550=10x
Divide both sides by 10
55=x
So, 55 batches were baked.