the given expression is
we rewrite to obtain;
we apply the difference of two squares formula to obtain;
we factor further to obtain;
this will give us;
m = (y2 - y1) / (x2 - x1) | * (x2 - x1)
m * (x2 - x1) = y2 - y1 | + y1
m * (x2 - x1) + y1 = y2
answer d is correct.
this is the way of writing that equation.
correct choice is b
let x% be your final test score, then the average of all test scores is
since you must have an average between 80% and 89%, then
x is measured in percent, then the greatest value of x can be 100%. you get that