The total revenue r (in dollars) is directly proportional to the number of units sold x. when 500 units are sold, the total revenue is $4825. write a mathematical model that relates the total revenue r to the number of units sold x.

y = 9.65x

Step-by-step explanation:

Given that total revenue is directly proportional to the number of units sold

Let the number of units sold be represented by x and the total revenue be represented by y

Given y∝x

y = kx where k is some constant

Also given that when 500 units are sold, the total revenue is $4825.

Here y=4825 and x=500

Now

k=9.65

Therefore the equation representing the relation between the total revenue and the number of units sold is

y = 9.65x

distance covered by pamela in 9 l of fuel = 99km

let us apply unitary method here.

distance covered by pamela in 1 l of fuel =99/9 =11 km

now let us find distance covered by pamela if she has 12 l of fuel.

distance covered in 12 l = distance covered in 1 l of fuel * 12

we know that distance covered by here in 1 l is 11 km.

so distance covered in 12 l of fuel = 11*12 = 132 km.