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GrogVix [38]
3 years ago
6

an adult blinks about 450 times in 30 minuets. a twelve year old blinks about 150 times in 15 minuets. how many more times does

an adult blink in 60 minuets than a twelve year old?
Mathematics
1 answer:
Elena-2011 [213]3 years ago
8 0

If an adult blinks 450 times in 30 minutes, then he will blink 900 times in 60 minutes.

A 12-year old blinks 150 times in 15 minutes, so he will blink (150 x 4) in 60 minutes, which comes out to: 600.

so 900-600

An adult blinks 300 times more in 60 minutes than a 12-year old.

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The best thing to do is either to find a common denominator or convert them to decimals.
I will find a common denominator.
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You multiply the first fraction by 5
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You then multiply the second by 3.
4*3= 12
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The alternative method is to put them into decimals, in which case 2/3= 0.66 and 4/5= 0.8
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Answer:

A

Step-by-step explanation:

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\displaystyle f(x)=\frac{x-16}{x^2+6x-40}\text{ and } g(x)=\frac{1}{x+10}

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In order to add the two terms, we must have a common denominator. To achieve this, we can multiply to second term by (x - 4). Therefore:

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Multiply:

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