Answer:
let the grade points be a,b,c
a+b+c=258
b=c+10( since she noticed that on tests two and three,she scored 10 points fewer).
The intercept is

.
This is the y-intercept. To find the x-intercept,

.
(1.365, 0)
Substitute the given number into the equation
Sum = 180(15-2)
Solve brackets
180(13)
Which is equal to 2340
So, the sum of interior angles is 2340 degrees
There's no such factors that will evenly divide into 86 ao ther for 86 is a improper number when it comes to product .
- Hopee this helps u in anyway .