2 years ago

Three out of five attempts, Kyan ski's a 180° perfectly. What percent would describe his success?

Mathematics

1 answer:

trapecia [35]2 years ago

5 0

Divide 3 by 5 and then multiply by 100 to get percentage.

3/5 = 0.60 x 100 = 60%

Answer: 60%

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Siddarth is putting baseball cards into a book that has 100 pages. Each page holds 9 cards. If Josh has 828 baseball cards, how

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Answer: 8

Step-by-step explanation: You would have to divide 828/9. The answer would be 92. You would then subtract this number from 100 pages to get your answer.

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3 years ago

Chad earned $30 for raking leaves. He has also earned money by doing chores for 6 weeks. Altogether, he has earned $120. How muc

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3 years ago

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3 years ago

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Find the diameter, rounded to the nearest tenth.<br>a) 55.5<br>b) 68.2<br>c) 60.7<br>d) 49.1

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Step-by-step explanation:

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3 0

3 years ago

The number of bacteria in a refrigerated food product is given by N ( T ) = 22 T 2 − 123 T + 40 , 6 < T < 36 , where T is

antoniya [11.8K]

Answer:

$N(T(t)) = 1408t^2 - 385.6t - 105.52$

Time for bacteria count reaching 8019: t = 2.543 hours

Step-by-step explanation:

To find the composite function N(T(t)), we just need to use the value of T(t) for each T in the function N(T). So we have that:

$N(T(t)) = 22 * (8t + 1.7)^2 - 123 * (8t + 1.7) + 40$

$N(T(t)) = 22 * (64t^2 + 27.2t + 2.89) - 984t - 209.1 + 40$

$N(T(t)) = 1408t^2 + 598.4t + 63.58 - 984t - 169.1$

$N(T(t)) = 1408t^2 - 385.6t - 105.52$

Now, to find the time when the bacteria count reaches 8019, we just need to use N(T(t)) = 8019 and then find the value of t:

$8019 = 1408t^2 - 385.6t - 105.52$

$1408t^2 - 385.6t - 8124.52 = 0$

Solving this quadratic equation, we have that t = 2.543 hours, so that is the time needed to the bacteria count reaching 8019.

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3 years ago