Do the area of the circle as a whole minus (72/360 x radius^2) and then minus the other grey area.
Hello! To solve this equation, let's set it up like this: 75 + 20m = 35m. This is because Company B does not charge an upfront fee, so all you have to do is 35m and Company A charges $75 upfront and then $20 per month, so you do 75 + 20m. First, you subtract 20m from both sides. When you do, you get 75 = 15m. Now, you divide each side by 15 to isolate the m. When you do that, you get 5. Let's plug in the numbers to see what we get. 20 * 5 is 100 + 75 = 175. 35 * 5 =175. 175 = 175. There. The two companies will charge the same amount in 5 months. m = 5.
The perpendicular slope would be the negative reciprocal of -3, which is .
Let's see what the y-intercept should be, by finding one third of -6 and seeing how much we need to add or subtract to reach -9.
1/3 times -9 is -3.
To reach -6, we need to subtract 3.
So, the y-intercept is 7.
The equation is: .