A bus company usually transports 12 000 people per day at a ticket price of $1. The company wants to raise the ticket price. For every $0.10 increase in the ticket price, the number of riders per day is expected to decrease by 400. Calculate the ticket price that will maximize revenue.

answer:

Step-by-step explanation:

40x^2+800x+12000

= x^2+20x+300

if y = x^2+20x+300

then the max is calculated by finding the value of first derivitive, that is:

y' = 2x+20 = 2(x+10)

y' = 2(x+10) = 0 then x = 10

that is the price of the ticket is $2.00

Verification:

At the price of $1.90, (total riders 8400) the total revenue will be  $15,960 and

 ...              

 $2.00, (total riders 8000)   ...                              

$16,000 and  

<- max revenue

 ...                

$2.10, (total riders 7600)  ...                              

$15,960

answer: $2.00 per ticket will maximize the revenue.

126.66 m²

step-by-step explanation:

the pertinent area formula is a = πr², where r is the radius.

here, a = π(6.35 m)² = 40.32π, or approximately 126.66 m²

b.-4 units

all you   do is count how many times you move