A family has two cars. During one particular week, the first car consumed 15 gallons of gas and the second consumed 40 gallons of gas. The two cars drove a combined total of 1400 miles, and the sum of their fuel efficiencies was 60 miles per gallon. What were the fuel efficiencies of each of the cars that week? first car: miles per gallon.
Second car: miles per gallon.

The decibel level of sound is 50 db greater on a busy street than in a quiet room where the intensity of sound is watt/m2. the level of sound in the quiet room is db, and the intensity of sound in the busy street is watt/m2. use the formula , where is the sound level in decibels, i is the intensity of sound, and is the smallest sound intensity that can be heard by the human ear (roughly equal to watts/m2).

Liz had 140 pens and inna had 100 pens. after inna gave liz some pens, liz had 3 times as many pens as inna. how many pens did inna give liz?

    choose the correct definition for  extremo.  a.  end      b.  extra      c.  extract      d.  eventual