Ok, so what this question is really asking you is: 
What is
and that equals 
Now because the the number is 2.4 plot that point
a^2 + b^2 = c^2
9^2 + 7^2 = get the answer then find the square root of it
Answer:
Company must not produce more than 193,650 units to keep cost as $387
Step-by-step explanation:
we are given with the cost function as
y = 0.002x - 0.30
where x is the number of items produced
We are asked to determine the number of items must be produced so that the cost of production does not go beyond $387
Hence
we put y = 387 and then solve the equation thus formed for x
y = 0.002x - 0.30
387 = 0.002x - 0.30
adding 0.30 on both sides
387+0.30=0.002x
387.30=0.002x
dividing both sides by 0.002

x=193,650
Company must not produce more than 193,650 units to keep cost as $387
Distributive property, the parenthesis means you multiply.