Which number has the same value as 40 tens?

Identify an equation in point slope form for the line perpendicular to y=3x+5 that passes through (4,-1)

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.

Which of the following is the best first step in solving the equation below? 4+2㏒³x=17