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# the temperature is 50'F the temperature will decrease by 4'F each hour . let h be the number of hours when will the temperature be below 32

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the temperature is 50'F the temperature will decrease  by 4'F each hour . let h be the number of hours when will the temperature be below 32'F?

A 50-4h<32

B 50-4h<32

C 50+ 4h<32

D 50 + 4h<32

Feb 28, 2019

#1
+3

h = hours

temp starts at 50

decreases by four each hour     - 4 h

< 32

50 - 4h < 32   solve for h.....subtract 50 from both sides of the equation

-4h < -18    divide both sides by -4 (remember when you multiply or divide an inequality by a negative the <> reverses)

h> 4.5 hours

Feb 28, 2019
edited by ElectricPavlov  Feb 28, 2019

#1
+3

h = hours

temp starts at 50

decreases by four each hour     - 4 h

< 32

50 - 4h < 32   solve for h.....subtract 50 from both sides of the equation

-4h < -18    divide both sides by -4 (remember when you multiply or divide an inequality by a negative the <> reverses)

h> 4.5 hours

ElectricPavlov Feb 28, 2019
edited by ElectricPavlov  Feb 28, 2019