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3 years ago

Select two ratios that are equivant to 7:10

Mathematics

2 answers:

nikdorinn [45]3 years ago

7 0

Answer:

70:100 700:1000 14:20 140:200

STatiana [176]3 years ago

7 0

70:100 and 14:20 are equivalent

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Answer:

Yes

Step-by-step explanation:

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2 years ago

Mary ran at a steady speed in a 10-mile race. Her finish time was 2 hours. Mary can bike the same

denpristay [2]

Answer:10/2

Step-by-step explanation:

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3 years ago

.A tank contains seven liters of 10% alcohol solution. How many liters of 6% alcohol solution should be added to have 8% alcohol

zmey [24]

Answer: 7 liters of 6% alcohol solution.

Step-by-step explanation:

We have 7 liters of 10% alcohol solution, and in this the total amount of alcohol is

A = (10%/100%)*7 L = 0.1*7L = 0.7L

Now, suppose that we add N liters of 6% alcohol solution, then we have a total of:

(N + 7) Liters

And the total amount of alcohol would be:

(6%/100%)*N + 0.7L

0.06*N + 0.7L

The quotient between the total volume of alcohol and the total volume of liquid needs to be 0.08 (because we want a percentage of 8% of alcohol, and the decimal form of 8% is 0.08)

Then:

(0.06*N + 0.7L)/(N + 7L) = 0.08

We want to sove this for N

(0.06*N + 0.7L) = 0.08*(N + 7L)

0.06*N + 0.7L = 0.08*N + 0.56L

0.7L - 0.56L = 0.08*N - 0.06*N

0.14 L = 0.02*N

0.14L/0.02 = N = 7L

Then we need to add 7 liters of 6% alcohol solution.

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3 years ago

Helppp quickkkkkkk enough points

Fynjy0 [20]

Answer:

$a=2\\\\ b = 20\\\\ c = 47$

Step by step explanation:

$a(x) = 2(x+5)^2 -3\\\\~~~~~~~=2(x^2 +2 \cdot 5 \cdot x +5^2) -3\\\\~~~~~~~=2(x^2 +10x+25) -3\\\\~~~~~~~=2x^2 +20x +50 -3 \\\\~~~~~~~=2x^2 +20x +47\\\\\text{By comparing}~ 2x^2 +20x +47~ \text{with the standard form}~ ax^2 +bx+c,\\\\a=2,~ b = 20,~ c = 47$

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1 year ago

Read 2 more answers

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Answer:

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3 years ago