The sum of n terms in an arithmetic series is given as Sn=17n-2n^2 divided by 2 a) Find S30
b) Find the first term and the common difference.
c) Determine a simplified formula for tn.

mean, 40.6

step-by-step explanation:

step-by-step explanation:

assume that you have 3 different side lengths.   apply the pythagorean theorem here:   square each of the two shortest sides; call them a and b, so that their squares are a² and b².   also square the longest side, calling the result c².

now, if a² + b² = c² is true, the triangle is a right triangle; otherwise it is not a right triangle.