Decide whether the rates are equivalent. Divide.(1.) 25 minutes for $3,49 minutes for $6(2.) 96 miles on 4 gallons, 216 miles on 9 gallons.

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 equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

If private savings 'v' = 0.75s and total savings 's' equals $4.20 billion, solve for public and private savings.