If 5 is added to a number and the sum is doubled, the result is 7 less than the number. what is the number? write your answer as a number only.

Consider the function f(x)=−2/3x+5 . what is f(1/2) ? enter your answer, as a simplified fraction, in the box. f(1/2)=

A. 127 cm^2 b. 144.5 cm^2 c. 172 cm^2 d. 50 cm^2

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.