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AleksandrR [38]
3 years ago
6

The price of an item yesterday was $130. Today, the price fell to $39. Find the percentage decrease. ​

Mathematics
1 answer:
Mrac [35]3 years ago
3 0

Answer:

30% decrease

Step-by-step explanation:

We have to divide 39 by 130 and then find the percentage of it. 39/130 is equal to 3/10, and 3/10 is equal to 30%. That means that it was a 30% decrease.

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A grocer wants to mix two kinds of coffee. One kind sells for $0.85 per pound, and the other sells for $2.70
Sedaia [141]

Answer:

x = $0.85 per pound = 19.85 pounds

y = $2.70 per pound = 1.14 pounds

Step-by-step explanation:

Let

x = $0.85 per pound

y = $2.70 per pound

x + y = 21 (1)

0.85x + 2.70y = 19.95 (2)

From (1)

x = 21 - y

Substitute x = 21 - y into (2)

0.85x + 2.70y = 19.95 (2)

0.85(21 - y) + 2.70y = 19.95

17.85 - 0.85y + 2.70y = 19.95

- 0.85y + 2.70y = 19.95 - 17.85

1.85y = 2.1

y = 2.1 / 1.85

y = 1.14

Substitute y = 1.14 into (2)

0.85x + 2.70y = 19.95

0.85x + 2.70(1.14) = 19.95

0.85x + 3.078 = 19.95

0.85x = 19.95 - 3.078

0.85x = 16.872

x = 16.872 / 0.85

x = 19.85

x = $0.85 per pound = 19.85 pounds

y = $2.70 per pound = 1.14 pounds

4 0
3 years ago
The ratio of the radii of two spheres is 2:5. The volume of the smaller sphere is 192 in3. What is the volume of the larger sphe
Evgen [1.6K]
Ratio of volumes is 2^3:5^3 or 8:125 192/V = 8/125 V = 3000 in^3
4 0
3 years ago
Read 2 more answers
What is the value of the function y=2x−3 when x=−1 ?
san4es73 [151]

Answer:  First option is correct.

Step-by-step explanation:

Since we have given that

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As we have given that x= - 1

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y=2x-3\\\\y=2(-1)-3\\\\y=-2-3\\\\y=-5

So, the value of the function is -5.

Hence, First option is correct.


7 0
3 years ago
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ANTONII [103]

Answer:

377

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6 0
3 years ago
Please dont answer if you dont know it, im taking an exam
Anastaziya [24]
Cubic for sure. I’m in accelerated math no flex happy to help
6 0
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