The total revenue r (in dollars) is directly proportional to the number of units sold x. when 25 units are sold, the total revenue is $300. write a mathematical model that relates the total revenue r to the number of units sold x.

Step-by-step explanation:

The total revenue R (in dollars) is directly proportional to the number of units sold x. This means that

R is directly proportional to x

If we introduce a constant of proportionality, k, it becomes

R = kx

When 25 units are sold, the total revenue is $300. We will substitute the value of R and x to get a value for k. It becomes

300 = 25k

K = 300/25 = 12

The mathematical model that relates the total revenue R to the number of units sold x will be

R = 12x

answer: i'm not going to give you the answer, but some hints to work it out.

step-by-step explanation: so, if there is a straight line that means that the line angle is 180°. so we subtract the 2 angle measures provided, (15 and 38) from 180. so the answer is 180 - (38 + 15). (you have to solve the equation)