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aliina [53]
3 years ago
15

A new bank customer with ​$3,200 wants to open a savings account. The bank is offering a simple interest rate of 5​%. How much i

nterest will the customer earn after 4 years?
A- $640
B- $160
C- $40
D- $960
Mathematics
2 answers:
telo118 [61]3 years ago
5 0
The answer would be:
A-$640

Explanation:
5% of $3200 =$160
$160x4=$640
MrRa [10]3 years ago
3 0

Answer:

A. $640

Step-by-step explanation:

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The value of r so the line that passes through (-5,2) and (3,r) has a slope of -1/2 is -2

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Given that line is passing through point (-5, 2) and (3, r)

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Slope of a line passing through point \left(x_{1}, y_{1}\right) \text { and }\left(x_{2}, y_{2}\right)  is given by following formula:

\text { Slope } m=\frac{y_{2}-y_{1}}{x_{2}-x_{1}}  --- eqn 1

\text { In our case } x_{1}=-5, y_{1}=2, x_{2}=3, y_{2}=\mathrm{r} \text { and } m=-\frac{1}{2}

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\begin{array}{l}{-\frac{1}{2}=\frac{r-2}{3-(-5)}} \\\\ {\text { Solving the above expression to get value of } r} \\\\ {=>-\frac{1}{2}=\frac{r-2}{3+5}} \\\\ {=>-8=\frac{r-2}{3+5}} \\\\ {=>-8=2(r-2)} \\\\ {=>-8=2 r-4} \\\\ {=>2 r=-8+4} \\\\ {=>2 r=-4} \\\\ {=>r=\frac{-4}{2}=-2}\end{array}

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