3 years ago

Help me 20 points!!! 7th-grade math.

Mathematics

1 answer:

fiasKO [112]3 years ago

5 0

Answer:

the answer is 0.7+1.8h

Step-by-step explanation:

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Of the 25 sheep in a flock 34% are white. how many sheep are white

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8.5 sheep are white. 34% of 25 is 8.5.

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3 years ago

Verb dale had a total of 45.8 inches of rain this year. This year's total was 7.48 inches greater than last year's total. What w

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If stratified random sampling with proportional allocation is used to select a sample of 25 high schools, how many would be sel

gregori [183]

Answer:

02 High Schools would be selected from the stratum with a percent-free-lunch value of 40 less than or equals x.

Step-by-step explanation:

As the sample size needed is 25 and total schools are 100 so this indicate 1 school in each 4 schools is to be selected. This is given as

$n=\frac{n_{total}}{n_{sample}}\\n=\frac{100}{25}\\n=4$

Now as the schools with percent free lunch are 8 so now

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3 years ago

A typical running track is an oval with 74-m-diameter half circles at each end. a runner going once around the track covers a di

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Answer:

Her centripetal acceleration during the turn at each end of the track is $0.432\, \frac{m}{s^{2}}$

Step-by-step explanation:

Total distance covered in one round , D= 400 m

Time taken to cover one round , T = 1 min 40 s = 100 sec

Speed of runner , $V=\frac{D}{T}=\frac{400}{100}\, \frac{m}{s}= 4.0\, \frac{m}{s}$

Now centripetal acceleration is given by

$a_c=\frac{V^{2}}{R}$

where $V= 4.0\frac{m}{s}$

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$\therefore a_c=\frac{4^{2}}{37}\, \frac{m}{s^{2}}=0.432\, \frac{m}{s^{2}}$

Thus her centripetal acceleration during the turn at each end of the track is $0.432\, \frac{m}{s^{2}}$

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4 years ago

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4 years ago

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