7*100+2*1= 702
10+5*1= 15
702+15= 717
i hope that is really does help if it don't i am sorry
The function is: f ( x ) = - x² + 60 x - 116 is in the form: f ( x ) = a x² + b x + c
Part A:
x = -b / 2 a = - 60 / ( - 2 ) = 30
Then we will charge it into the function:
f ( 30 ) = - 30² + 60 · 30 - 116 = - 900 +1,800 - 116 = 784
The vertex is ( 30, 784 ).
It means that the maximum profit is $784, when 30 windshields are repaired.
Part B:
x 1/2 = ( -60 +/- √(3600 - 464 )/ (- 2 ) = ( -60 +/- 56 ) / ( - 2 )
x 1 = 2, x 2 = 58
It means that a shop has to repair at least 2 windshields and not more than 58 windshields for making a profit.
Answer:
c. 10
Step-by-step explanation:
Pick any two points from the table. I chose (0, -20) and (1, -10)
Let's find the slope between your two points.
(0,−20) (1,−10)
(x1, y1)=(0, −20)
(x2, y2)=(1, −10)
Use the slope formula:
m= y2 − y1 / x2 − x1
= −10 − −20 / 1 − 0
= 10 / 1
= 10
