Use the Pythagorean Theorem to find x.
A= 7 C=14 a) 98 b) 245 c) 21 d) 7

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%