Fill the missing number to make an equivalent ratio : 40 cars : 32 trucks = 5 cars : ? Trucks

What is the length of the unknown leg in the right triangle ?

Which of the following is true for the relation f(x)=2x^2+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.