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Salsk061 [2.6K]
3 years ago
15

gabby's piggy bank contains dimes and nickels worth $6.40. If she has 84 coins in all, how many of each does she have?

Mathematics
1 answer:
Sergeu [11.5K]3 years ago
5 0
If we let Q be the number of quarters and N be number of nickels, this is the formula we would use:
[1] 25Q + 5N = 635 (using cents instead of dollars)


We also know something about Q and N.

[2] Q + N = 51


So multiply both sides of the second equation by 5. The reason we do this is because we're going to need to cancel out one of the variables (either Q or N) to solve for the other one. If we multiply times 5, we'll have 5N in both equations.
5Q + 5N = 255

Now we have two equations, and the second one can be subtracted from the first.

25Q + 5N = 635
-(5Q + 5N) = -255
---------------------
20Q = 380
so
Q = 19

There are 19 quarters.

And since there are 51 coins in all, 51-19 = 32 nickels.
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Oksanka [162]

The distance from their house the Bensons' after 412 hours will be 18, 640 miles

<h3>What is a function?</h3>

A function is an expression or rule that explains the relationship between a dependent and independent variable.

Given the function;

d= 45 t + 100

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Substitute into the formula

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6 0
1 year ago
What is the equation of a parabola that opens left with a vertex of (-1,1)
xeze [42]
I think it is not possible to find a certain equation from just a given points, it must have more given information because there is a lot of parabola pass throw (-1,1).
6 0
3 years ago
Please help me out and help me show work ??
DochEvi [55]

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All together they add to 72.

So n + n+1 +n +2 = 72.

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3 years ago
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Talja [164]

Answer:

I would say 49 is your answer

Step-by-step explanation:

53 plus 78 qould equal 131

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