ANSWER
$3
Or
$4
EXPLANATION
The revenue function is

The cost function is,
C=600-50t
In order to break even, revenue must be equal to cost.

Group every term on the LHS.


Divide through by 50.

Factor to obtain,


63,594 98,697 59,835 ----------
222,126
Answer:

Step-by-step explanation:
<u><em>The complete question is</em></u>
Angelo recently opened a bank account and deposits the same amount each week. After 8 weeks, he deposited $280. He wants to deposit a total of 420 in his account. How many weeks will it Angelo to deposit a total of $420
we know that
A relationship between two variables, x, and y, represent a proportional variation if it can be expressed in the form
or 
Let
x ----> the number of weeks
y ----> the total deposit in the bank account
In this problem we have a proportional relationship between the variables x, and y.
we have the ordered pair (8,280)
Find the constant of proportionality k or slope of the linear equation

so
The linear equation is

For y=420
Substitute in the linear equation

Solve for x

One way is to round the numbers to nearest five. (586 - 321 will be 585-320). Another way is to round it off by tens. (586 - 320 will be 590-320). Hopefully this helps you and god luck!
5 would be your x coordinate because remember coordinates are written in (x,y)