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OleMash [197]
3 years ago
12

Every evening Jenna empties her pockets and puts her change in a jar. At the end of the week she counts her money. One week she

had 38 coins, all of them dimes and quarters. When she added them up, she had a total of $6.95. how many coins did jenna have
Mathematics
1 answer:
Usimov [2.4K]3 years ago
3 0
D + q = 38......d = 38 - q
0.10d + 0.25q = 6.95

0.10(38 - q) + 0.25q = 6.95
3.80 - 0.10q + 0.25q = 6.95
-0.10q + 0.25q = 6.95 - 3.80
0.15q = 3.15
q = 3.15 / 0.15
q = 21 <== number of quarters

d + q = 38
d + 21 = 38
d = 38 - 21
d = 17 <== number of dimes



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Answer: The correct option is a.Quadrilateral DEFG is a rhombus because opposite sides are parallel and all four sides have the same length.

Explanation:

It is given that  coordinates of the vertices of quadrilateral DEFG are D(−2, 5) , E(2, 4) , F(0, 0) , and G(−4, 1) .

The distance formula for two points is given below,

D=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}

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FG=\sqrt{(-4-0)^2+(1-0)^2}=\sqrt{17}

DG=\sqrt{(-4+2)^2+(1-5)^2}=\sqrt{20}

Slope formula,

m=\frac{y_2-y_1}{x_2-x_1}

Slope of DE,

m_1=\frac{4-5}{2+2}= \frac{-1}{4}

Slope of EF,

m_2=\frac{0-4}{0-2}= 2

Slope of FG,

m_3=\frac{1-0}{-4-0}= \frac{-1}{4}

Slope of DG,

m_4=\frac{1-5}{-4+2}= 2

The slope of opposite sides are equal, it means the opposite sides are parallel.

All four sides do not have the same length. It means it is not a rhombus.

From the figure it is noticed that the opposite sides are parallel.

Therefore, the correct option is a.Quadrilateral DEFG is a rhombus because opposite sides are parallel and all four sides have the same length.

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Plugging in the 119 for F, we get
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