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EQUIVALENT EXPRESSIONS #2

Directions:  For a science project at school, Emma was recording the temperature outside every morning before school, and every night before she went to bed.  Emma’s math teacher was helping her write expressions that tracked the changes in temperature each day.  Answer the questions below about Emma’s experiments and her expressions.

1)	 On Monday, Emma recorded a temperature of 15 degrees first thing in the morning.  Throughout the day, the temperature fell 0.5 degrees per hour.  Circle one of the expressions below that represents the temperature changes on Monday.  	         

a.	  t = 15 + 0.5h                    b.  t = 15 - 0.5h                    c.  t = 0.5 + -15h                    d.  t = 0.5 + 15h

2)	On Tuesday, Emma’s thermometer showed a temperature of -8 degrees when she woke up.  The temperature then rose 1 degree every hour.  Write an expression that represents the temperature change on Tuesday.  Use the variables t for temperature and h for hours.      		

3)	 On Wednesday, Emma’s math teacher helped her write the expression t = 4 + 2h to represent the temperature change for that day.  Circle all of the expressions below that are equivalent to t = 4 + 2h.   

a.	  t = h + 4 + h                  b.  t = 4 + 2h + 2h                 c.  t = 2h + 6 – 4h - 2           d.  t = 4 – 2h + 4h

4)	 On Thursday, Emma’s math teacher helped her write the expression t = 2(-h - 3) to represent the temperature change for that day.  Circle all of the expressions below that are equivalent to t = 2(-h - 3).   

a.	 t = -6 - 2h                       b.  t = 4h – 6h - 6                   c.  t = -2h – (-6)                    d.  t = -(6 + 2h)

5)	 On Friday, Emma came up with the expression t = -0.5(2 – h) to represent the temperature change. His math teacher came up with the expression t = 4(0.5h + 2) – 1.5h – 9 for the same day.  Are these expressions equivalent or not.  Explain your answer.  

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