If a true-false test with 5 questions is given, what is the probability of scoring (A) Exactly 80% just by guessing? (B) 80% or better by just guessing?

There is a line with slope 1/a going through the point (a, a²). find the equation of the line perpendicular to this line at this point. (don’t let this problem intimidate you! solve the problem as you would if i’d given you specific values. just use variables instead.)

Find the greatest common factor of the polynomial: 10x^5+15x^4-25x^3 10x^5 x^3 5x^3 5

If i have one apple and give you the apple, how many apples do i have?