Answer:
9r
Step-by-step explanation:
4r+9r-11r+7r
Combine like terms
13r -11r+7r
2r+7r
9r
P = 2(L + W) ....this is the perimeter of a rectangle
P = 40
L = 5
40 = 2(5 + W)
40 = 10 + 2W
40 - 10 = 2W
30 = 2W
30/2 = W
15 = W <=== ur answer is 15 ft
The cost to drive such a car 12,000 miles in 2012 was 7560
<em><u>Explanation</u></em>
The average cost of driving a medium sedan in 2012 was 0.63 per mile.
Now for finding the total cost to drive such a car, we need to <u>multiply the 'cost per mile' by the 'total number of miles'</u>.
So, total cost to drive 12000 miles 
If only 6 friends attended Armando's cookout, and he kept 3 cards for himself, then, 42 divided by 6 is 7.
Therefore, each friend received 7 cards.
Answer:
John needs 217 tiles.
Rate of change is 1.9 tiles per square foot
Step-by-step explanation:
Hallway area=3•38=114 ft²
Rate of change=190/100=1.9 tiles/ft²
Tile total=
T=area•rate
=114•1.9
T=216.6
(Round up because tiles are sold as whole units)
Total tiles=217
