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exis [7]
4 years ago
10

a jar contains half dollars and quarters there are 30 coins and all in the jar the total value of coins is $8.75 how many quarte

rs are in the jar
Mathematics
1 answer:
timama [110]4 years ago
7 0
D= half dollars
q= quarters

Half dollars + quarters = 30 coins
d+q=30

Step 1:
Solve for one variable:
d+q=30
Subtract q from both sides
d=30-q

Step2:
Find quantity of each coin
d= $0.50
q= $0.25

0.50d+0.25q= $8.75

Substitute d=30-q for d in this equation
0.50(30-q)+0.25q= 8.75
15-0.50q+0.25q= 8.75
15-0.25q= 8.75
Subtract 15 from both sides
-0.25q= -6.25
Divide both sides by -0.25
q= 25 number of quarters

Substitute q=25 in equation to find d
d+q=30
d+25=30
Subtract 25 from both sides
d=5 number of half dollars

Check:
0.50d+0.25q= $8.75
0.50(5)+0.25(25)= 8.75
2.50+6.25= 8.75
$8.75=$8.75

Hope this helps! :)

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Alborosie

Answer:

Step-by-step explanation:

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Evgesh-ka [11]
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Answer:

A. (AAA)

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Hope This Helped

3 0
2 years ago
What is the amplitude, period, and phase shift of f(x)=-4 sin (2x+3.14)-5
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Remember this: for a trig function of <span>y = A sin(Bx + C) + D

</span><span><span>amplitude is A
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</span><span>vertical shift is <span>D

So the amplitude is -4, the period is </span></span></span>π and the phase shift is -3.14/2 = 1.57.
8 0
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