Answer:
y=3*x
Step-by-step explanation:
john bought 3 notebooks for 9 dollars
so 9/3=3
notebooks costed 3 dollars each
x-number of notebooks
y-cost of notebooks
so
y=3*x
because 3 dollar cost every notebook you could buy.
if i buy 2 notebooks
so x=2
y=3*2=6 dollars
if I buy 3 notebooks
then y=3*3=9 dollars
end this way continues
Answer:C
Step-by-step explanation:
You can multiply 8 times 9 to get 72 and then move the decimal over to the right to get the answer of 7.2
Answer:
For Joy:
Strategy: Multiply through by 4
For Paulo:
Strategy: Evaluate the bracket
Explanation:
Given
Required:
Determine the strategies
For Joy:
Strategy: Multiply through by 4
<em>Done</em>
For Paulo:
Strategy: Evaluate the bracket
<em>Done</em>
Answer:
15 gallons
Step-by-step explanation:
So the easiest way to solve this one is basic reasoning. It's easy to find 3/4 of a number if you know what 1/4 is.
20/4 = 5, or 1/4 of 20 = 5
3/4 is 3 times as much as 1/4, so 5(3)=15
Or, you can solve using a proportion
3 x
_ = _
4 20
(those are fractions)
Cross multipy
3 (20) = 4x
60 = 4x
Divide both sides by 4 to isolate the variable
15 = x
The final way to solve this is by converting the decimal to a fraction. 3/4 = 0.75
20 x 0.75 = 15
