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3 years ago

7. Alice has a coin purse containing $5.40 in dimes and quarters. There are 24 coins all together. How

Mathematics

1 answer:

Zarrin [17]3 years ago

4 0

Answer:

20 quarters 4 dimes

Step-by-step explanation:(Elimination method)

I will replace 0.10, 0.25 and 5.4 by 10 25 and 540 to get rid of the decimals

D +Q = 24

10D + 25Q = 540

_________________________

Multiply the first equation by -10

-10D -10Q = -240

10D + 25Q = 540 Subtract the fractions:

0 + 15Q = 300

Q= 20

24-20 = 4 4 dimes

4 dimes =$ 0.40

20 quartes = $5

$5+$0.40=$ 5.40

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The value of z is zero

Step-by-step explanation:

The slope is the steepness of the line.

The formula for slope is given by:

$m=\frac{y_2-y_1}{x_2-x_1}\\Here\\(x_1,y_1)\ are\ the\ coordinates\ of\ first\ point\ on\ line\\(x_2,y_2)\ are\ the\ coordinates\ of\ second\ point\ on\ line$

Here

(x1,y1) = (1,z)

(x2,y2) = (2,8)

So,

$m=\frac{y_2-y_1}{x_2-x_1}\\8 = \frac{8-z}{2-1}\\8=\frac{8-z}{1}\\8-8 = -z\\z = 0$

The value of z is zero

Keywords: slope, Line

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