C=400-5x+0.125x^2 where x is the number of gas grills produced. How many units should be produced each day to yield a minimum cost ?

20

Step-by-step explanation:

x=20

Step-by-step explanation:

take the derivative and set to zero

c prime = -5 + .25x

0 = -5 + .25x

.25x = 5

x=20

step-by-step explanation:

no, her answer is not correct.   we square the lengths of all sides and then determine whether the pythagorean theorem holds here:

9² + 15² = 306.   this is not equal to the square of the longest side ( that square being 395.   answer c is correct.

the 8 in 8,420 is in the thousands place so it's value is 8 thousand.

the 8 in 6,870 is in the hundreds place so it's value is 8 hundred.

divide 8000 by 800 to find the answer:

8000 / 800 = 10

the 8 in 8,420 is 10 times greater than the 8 in 6,870