The length of a rectangle is twice the width. the area is 512yds^2 find length and width

In the field of thermodynamics, rankine is the unit used to measure temperature. one can convert temperature from celsius into rankine using the formula c= r/1.8 - 273, what is the temperature in celcius corresponding to r degrees rankine.

It says factor each expression 49x-28?

How far could you drive on 50 gallons of gas