For 6 hours charges $330
for 9 hours charges x
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x = 9*330/6 = 495 so choice C. is right
Solution:
we have been asked to find
The expression is equivalent to 
we can simplify the given expression as below

Hence the simplified expression , equaivalent to the given expression is 1/2.
Answer:
27
Step-by-step explanation:
22 + 6 = 28 - 1 = 27
Given 4 boxes of pencils cost $5,
Unknown- slope
$1.25 per box since $5/boxes
Equation y=mx+b
Substitute $1.25/per box for m
Solve y=$1.25x
The Check
$5=$1.25/per box(4 boxes)
$5=$5