Answer:
Step-by-step explanation:
Answer:y=15
3 y
___=___
15 75
cross multiply
15y=225
divide both sides by 15
y=15
2/8=1/4=3/12=6/24=20/80=10/40
Answer:
Expand
2b + 3 = 2 -3b -9
Correct like terms
2b + 3 = 3b - 7
Move 2b to the otherside as a negative number and -7 to the otherside positive number.
-4 = -5b
Divide both sides by negative five
b is equal to 4/5
Step-by-step explanation:
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Variables:
cost of 1 hot dog = x
cost of 1 hamburger = y
Set up a system of equations and use substitution
x + y = 2.75
x + 7y = 11.75
x + y = 2.75 can be rewritten as y = -x + 2.75
x + 7 (-x + 2.75) = 11.25
-6x + 19.25 = 11.25
-6x = -8
x = .75
plug x back into other equation to find y
y = -.75 + 2.75
y = 2.00
1 hot dog = $0.75
1 hamburger = $2.00
5% is just another way of writing 5/100
So we have 5/100 of 88.5 → 5100×88.5
This is the same as 5×88.5/100=5×0.885
But 5 is 1/2×10
So we can write 5×0.885 as 1/2×10×0.885
=1/2×8.85=4.425
hope it helps!
