1/2 hour = 30 mins
30 x 2 = 60 mins = 1 hour
4.5 x 2 = 9
9mph
Make a system of equations:
0.10x + 0.25y = 3.95
x + y = 23
x + y = 23
Subtract 'y' to both sides:
x = -y + 23
Plug in -y + 23 for 'x' in the first equation:
0.10(-y + 23) + 0.25y = 3.95
Distribute 0.10:
-0.10y + 2.3 + 0.25y = 3.95
Subtract 2.3 to both sides:
-0.10y + 0.25y = 1.65
Combine like terms:
0.15y = 1.65
Divide 0.15 to both sides:
y = 11
Plug this into any of the two equations to find 'x':
x + y = 23
x + 11 = 23
Subtract 11 to both sides:
x = 12
So Sally has 11 dimes and 12 quarters.
What? I don’t understand the question
That means you would do seventy-two divid by six which equals twelve.
I think the laundry detergent that costs $7.00 is better because if you buy two of them it will be $14.00 and it will wash 100 loads. But of you buy two of the $4.80 detergent, it will be $9.60 and it will only wash 64 loads so I think the other one is better because it can wash 36 loads more for only $4.40 more.
I hope this is right and it helps! :)
