Round each number to the nearest whole number. what is the best estimate for the sum of 317.38 82.21?

In trapezoid efgh, m∠hef=(4x2+16)∘ and m∠gfe=(5x2+12)∘. find the value of x so that efgh is isosceles. i'm desperate.

Planning for the possibility that your home might get struck by lighting and catch on fire is part of a plan for ?

On a string instrument, the length of a string varies inversely as the frequency of its vibrations. an 11-inch string has a frequency of 400 cylces per second. find the frequency of a 10-icnch string.