I need help. I do not know if I am wrong or right.

Find the slope of the line passing through a pair of points

There are 93 calories in a small candy bar how many calories are ther in a half dozen small candy bars?

To find the inverse of a number a, one can use the equation f(c) = a-1/c=0 where c is the inverse of a use the secant method of finding roots of equations to find the inverse of a = 2.5 ,er = 0.001%