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3 years ago

Find the sum of the first 13 terms in the series -5+1+7...+67

Mathematics

1 answer:

valentinak56 [21]3 years ago

5 0

This is an arithmetic series with common difference 6

S13 = (13/2)[2*-5 + (13-1)*6)] = 403

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Ben strikes out 90 times in 340 at bat. What percent of the time does Ben strike out

nikklg [1K]

Answer:

$percentage=26.47\%$

Step-by-step explanation:

$Ben\ strikes\ in\ 340\ efforts=90\\\\So\ fraction\ he\ can\ strike\ 1\ effort=\frac{number\ of\ times\ he\ strikes}{total\ efforts}\\\\So\ fraction\ he\ can\ strike\ in\ 1\ effort=\frac{90}{340}\\\\So\ fraction\ he\ can\ strike\ in\ 1\ effort=\frac{9}{34}\\\\He\ can\ strike\ in\ 100\ efforts=\frac{9}{34}\times 100\\\\percentage=26.47\%$

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3 years ago

Your new phew is standing on his deck which is 4 feet off the ground. He tosses his toy up into the air. The equation h(t) = -2t

Tpy6a [65]

Answer:

The height of the toy is 9 feet after 1 second

Step-by-step explanation:

we have

$h(t)=-2t^2+7t+4$

where

h(t) is the toys height from the ground

t is the time in seconds

For t=1 sec

substitute the value of t in the quadratic equation and solve for h(t)

$h(1)=-2(1)^2+7(1)+4$

$h(1)=9\ ft$

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3 years ago

Alice works at a health care facility. She has measured the hemoglobin levels of 200 people. The data follows a normal distribut

rewona [7]

Since the data follows a normal distribution, the 68-95-97 rule can be used to describe the number of people falling under N standard deviations from the mean. Since the standard deviation is 1, hemoglobin levels of 13 -15 g/dL contains 68% of the sample, or 136 people. This means the 32 people have less than 13 g/dL and 32 people have more than 15 g/dL.

5 0

3 years ago

I need help in math :(

IgorLugansk [536]

B. 8 1/5 is the answer

7 0

3 years ago

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12 m<br> 9 m<br> 8 m<br> I am looking for what shape it is

Mariulka [41]

Answer:

TRIANGLE

Step-by-step explanation:

ISOCELES

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3 years ago