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3 years ago

Ashley has $9.05 in dimes and nickels. If she has a total of 108 coins, how many of each type does she have?

Mathematics

1 answer:

klemol [59]3 years ago

6 0

Answer:

$73\:\mathrm{dimes},\\35\:\mathrm{nickels}$

Step-by-step explanation:

We can write the following system of equations:

$\begin{cases}10d+5n=905,\\d+n=108,\\\end{cases}$ , where $d$ is the number of dimes she has and $n$ is the number of nickels she has.

Multiply the second equation by $-5$ and add both equations to solve for $d$ :

$\begin{cases}10d+5n=905,\\-5d-5n=-540,\\\end{cases}\\5d=365,\\d=\fbox{$73$}$ .

Plug $d=73$ into any equation to solve for $n$ :

$73+n=108, \\n=\fbox{$35$}$

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Answer:

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Step-by-step explanation:

The general form of a least square regression line is:

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The values of ∑X, ∑Y, ∑XY and ∑X² are computed in the table below.

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Thus, the number of households using online banking at the beginning of 2007 is 31.8.

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Answer:

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Step-by-step explanation:

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