You multiply 0.4 by 4.2 and that equals 1.68 so sumeet uses 1.68 gallons of gas in 4.2 hours.
Adding the two equations
3x + 6y + 3x - 6y = 36+0
6x = 36
x = 6
.
subtracting second equation from first
(3x + 6y ) - (3x-6y) =36 -0
12y = 36
y = 3
.
therefore
x = 6 and y = 3
(6,3)
Total divided by number of rows=number per row
63/7=9
9 per row
Answer:
i think 65 but if not then it is D impossible
Step-by-step explanation:
hope that helps
and that i wasn't to late