Posted by **amy** on Tuesday, September 7, 2010 at 11:19pm.

The expression 9a + 6s is the cost for a adults and s students to see a musical performance.

a. Find the total cost for three adults and five students.

b. The number of adults and students in a group both double. Does the cost double? Explain your answer using an example.

c. The number of students doubles, but the number of adults is cut in half. Is the cost the same? Explain your answer using an example

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**drwls**, Wednesday, September 8, 2010 at 5:55am
a. Substitute 3 for a and 5 for s and compute.

27 + 30 = ___?

b. Does 9*(2a) + 6*(2s) = 2*(9a + 6s) ?

The order that three numbers are multiplied does not affect the result.

c. Does 9*(2a) + 6*(s/2) = (9a + 6s) ?

Put another way, does

18a + 3s = 9a + 6s

Not unless 3a = s

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**Anonymous**, Thursday, September 11, 2014 at 7:41pm
a. 105 for 5 students and 108 for 3 adulots

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**Caca jama**, Wednesday, November 5, 2014 at 6:10pm
109

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