Multiply 75 by the number of surfboards sold to get 75x add that to what he makes giving lessons:
250 + 75x
He wants to earn at least 500 so the equation has to be greater than or equal to 500:
Answer: 250 + 75x > equal to 500
We know that
the area of a regular polygon is A=(1/2)*a*P
where
a is the apothem
and P is the perimeter
step 1
find the distance of the apothem
d=√[(y2-y1)²+(x2-x1)²]-----> d=√[(3)²+(-4)²]------> d=√25-----> d=5 units
A=(1/2)*a*P
a=5 units
P=40 units
A=(1/2)*5*40-----> A=100 units²
D is correct because 28 cases with 50 packs of paper and 200 sheets in each. That's multiplying.
Hoped I helped!
Any... That would be the answer