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3 years ago

8

A 15 ft latter leans against the side of a house the bottom latter is 6 feet away from the side of the house. Find the angle of

elevation of the ladder. Round your answer to the nearest tenth of a degree

1 answer:

Mumz [18]3 years ago

8 0

$cos = \frac{adj}{hyp}$
$\cos(x) = \frac{6}{15}$

$\cos(x) = .4$
$\cos(x) = 66$
approximately 66° ^^

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pantera1 [17]

your answer is 41.38

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3 years ago

The high temperature on Friday was 8 degrees above zero. The low temperature was 3 degrees below zero. Which expression can find

Andreas93 [3]

(8 + (-3)) / 2
= (8 - 3) / 2
= 5 / 2
= 2 1/2 or 2.5
The average temp is 2.5 degrees above zero.

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3 years ago

Is 3.14512 a rational number

zvonat [6]

No it is not because you can't make it into a fraction.

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3 years ago

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The authors of a paper presented a correlation analysis to investigate the relationship between maximal lactate level x and musc

ArbitrLikvidat [17]

Answer:

a) Sample correlation coefficient, r = 0.7411

bi) test statistic, t = 4.102

bii) P-value = 0.000736

Step-by-step explanation:

a) The formula for the sample correlation coefficient is given by the formula:

$r = \frac{S_{xy} }{\sqrt{S_{xx} S_{yy} }} }$

$S_{xx} = 2,648,130.357\\S_{yy} = 36.7376,\\S_{xy} = 7408.225$

$r = \frac{7408.225}{\sqrt{2648130.357*36.7376} }$

r = 0.7511

b)

i) formula for the test statistic is given by the formula:

$t = \frac{r\sqrt{n-1} }{\sqrt{1 - r^{2} } }$

sample size, n = 4

$t = \frac{0.7511\sqrt{14-1} }{\sqrt{1 - 0.7511^{2} } }$

t = 4.102

ii) Degree of freedom, df = n -2

df = 14 -2

df = 12

The P-value is calculate from the degree of freedom and the test statistic using excel

P-value =(=TDIST(t,df,tail))

P-value = (=TDIST(4.1,12,1)

P-value = 0.000736

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3 years ago

If 31,000 citizens died in an automobile accidents in 2015. how many died each hour

stira [4]

Work out the number of hours in 1 year:-

1 year = 365*24 = 8760

So the number dying each hour = 31,000 / 8760 = 3.54

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3 years ago

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