Question 1138021
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Part A


1 balloon costs 50 cents
x balloons cost 50*x cents (multiply both parts by x)
1 streamer costs 20 cents
y streamers cost 20*y cents


C = total cost in cents
C = (balloon cost) + (streamer cost)
C = (50x) + (20y)
<font color=red>C = 50x + 20y</font>


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Part B


Plug in x = 25 and y = 20
C = 50*x + 20*y
C = 50*25 + 20*y ..... replace x with 25
C = 50*25 + 20*20 .... replace y with 20
C = 1250 + 400 .... multiply
C = 1650 .... add


It costs <font color=red>1650 cents</font>, which is equivalent to, <font color=red>16.50 dollars</font> (divide 1650 by 100). 
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