Given function: y=-7.3x+39.7 Where y= number of gallons of water and x= number of minutes Put value of y=17.8 gallons and solving for x. 17.8=-7.3x+39.7 Subtract 39.7 from both sides -21.9=-7.3x Divide both sides by -7.3 3=x or x=3 minutes After 3 minutes the water in the tub will be 17.8 gallons.
Answer is C. 7/12 has the reciprocal of 12/7. When You multiply by a reciprocal, you just switch the numerator and denominator. The answer does NOT become negative. It would change the fraction itself. Example: 3/6= 6/3 5/7= 7/5