Question 1109822
<font color="black" face="times" size="3">Part (a)


Plug in N = 225 to find C


C = 150 + 2N
C = 150 + 2*225
C = 150 + 450
C = 600


It will cost $600

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Part (b)


Plug in C = 394 and solve for (or isolate) N. The idea is to undo PEMDAS.


C = 150 + 2N
394 = 150 + 2N
150 + 2N = 394
2N + 150 = 394
2N + 150 - 150 = 394 - 150 <font color=blue>subtract 150 from both sides</font>
2N = 244
2N/2 = 244/2 <font color=blue>divide both sides by 2</font>
N = 122


There are 122 people at the event.
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