A department store is selling a digital graphics tablet in small quantities. These are the cost and revenue functions associated with the tablets, where x represents the selling price of a single tablet:

R(x) = -0.388x2 + 76x
C(x) = -15.18x + 4,074

To make a profit, between what two values should the store set the selling price?

A.
$40 and $196
B.
$55 and $108
C.
$60 and $175
D.
$75 and $212

C.   $60 and $175

Step-by-step explanation:

we know that

Te profit is equal to the revenue minus the cost

we have

----> the revenue

---> the cost

Find the profit P(x)

Combine like terms

This is a vertical parabola open downward

The vertex represent a maximum

The x-intercepts represent the values of x when the value of P is equal to zero

That means

The interval between the two roots are the two values that the store should price to make a profit

using a graphing tool

Find out the x-intercepts

The x-intercepts are (60,0) and (175,0)

see the attached figure

therefore

Option C

i'm assuming it's looking for the missing length, which should be 4cm

hope this !

n=9

step-by-step explanation:

7 times a number = 7n

decreased by 13 = 7n-13

same as is =

5 times the number = 5n

increased by 5 = 5n+5

7n-13 = 5n+5

2n=18

n=9