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3 years ago

a rectangular swimming pool has a with of 25feet and an area of 1225 squares feet, what is the pools length

Mathematics

2 answers:

TEA [102]3 years ago

7 0

The answer would be 49ft.
1,225ft÷25ft=49ft

love history [14]3 years ago

3 0

S-length

s*25=1225
1225:25=s
s = 49(feet)

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Answer:

I believe the correct answer is B.

Step-by-step explanation:

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eduard

Answer:

$cos(\alpha+\beta)=-\frac{84}{85}$

Step-by-step explanation:

we know that

$cos(\alpha+\beta)=cos(\alpha)*cos(\beta)-sin(\alpha)*sin(\beta)$

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$cos^{2} (x)+sin^2(x)=1$

step 1

Find the value of $sin(\alpha)$

we have that

The angle alpha lie on the III Quadrant

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substitute

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$sin^2(\alpha)=1-\frac{64}{289}$

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$sin(\alpha)=-\frac{15}{17}$

step 2

Find the value of $cos(\beta)$

we have that

The angle beta lie on the IV Quadrant

The value of the cosine is positive and the value of the sine is negative

$sin(\beta)=-\frac{4}{5}$

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substitute

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step 3

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$cos(\alpha)=-\frac{8}{17}$

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$cos(\alpha+\beta)=-\frac{84}{85}$

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2 years ago

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