Thomas has 19.74 cookies he buys 72.73 and gets rid of 4.72 cookies. How many does he have???
1 answer:
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Answer and Step-by-step explanation:
Divide each side by 2.
x 5
This is the correct answer for getting the x by itself.
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Make a system of equations.
Plug in 2d for 'q' in the first equation:
Multiply:
Combine like terms:
Divide 0.60 to both sides:
Now plug this into any of the two equations to find 'q':
So she has 10 dimes and 20 quarters.
Plug in 2d for 'q' in the first equation:
Multiply:
Combine like terms:
Divide 0.60 to both sides:
Now plug this into any of the two equations to find 'q':
So she has 10 dimes and 20 quarters.
To solve this we are going to use a conversion factor. We know that 1 BTU per hour is approximately 778 foot-pounds of energy per hour, so our conversion factor will be: 
.
Now we just need to multiply <span>4000 BTU by our conversion factor:
</span>
<span>
We can conclude that the furnace released </span><span>3,112,000 foot pounds of energy in one hour.</span>
Now we just need to multiply <span>4000 BTU by our conversion factor:
</span>
<span>
We can conclude that the furnace released </span><span>3,112,000 foot pounds of energy in one hour.</span>