The base of a triangle is 9 cm correct to the nearest cm. The area of this triangle is 40 cm2 correct to the nearest 5cm2. Calculate the upper bound for the perpendicular height of this triangle.

Find the sum of the first 8 terms of the following sequence. round to the nearest hundredth if necessary.

Find the zeros of each function. f(x) = 6x^2 - 7x - 20

Add, subtract, multiply, or divide as indicated. list any restrictions for the variable(s) and simplify the answers when possible. 1) x-2 / x+5 + 3x / 2x-1 2) x+6 / x-6 - x^2 / x+6 3) x+9 / x-4 + x+2 / x^2-11x+28 4) x / x^2-64 + 11 / 2x^2+11x-40 5) 5 / x + 11 / x-3 - x-4 / x^2+2x-15