Round the numbers in each expression to the nearest whole number. Then select all expressions that are about 8. A. 3 1 5 + 5 7 9 B. 15 5 7 − 8 2 9 C. 1 5 8 + 5 2 5 D. 10 1 4 − 1 11 15 E. 2 7 10 + 4 8 9

i'm assuming that it's c.)   volcanoes built the mountains and earthquakes tore them down.

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.