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3 years ago

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It took Joe 3 hours swimming at a speed of 12 miles per hour to swim along the Charles River. If Jennifer is swimming the same p

ath along the Charles River at a speed of 9 miles per hour, how long will it take her to complete her swim?

1 answer:

polet [3.4K]3 years ago

7 0

Answer:

4 hours

Step-by-step explanation:

3 x 12 = 36

36/9 = 4

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Construct a right triangle whose perimeter is equal to 10cm and one acute angle is 60°

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How can we help you with this?

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3 years ago

For some reason, i forgot how to do this question... could someone help me?

AnnZ [28]

$\frac{3}{5} :11= \frac{3}{5} : \frac{11}{1} = \frac{3}{5} * \frac{1}{11} = \frac{3}{55}$

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Question in picture<br><br>A) 16/63<br><br>B)-16/63<br><br>C) 63/16<br><br>D) -63/16

Orlov [11]

ANSWER
$\tan(x + y) = - \frac{63}{16}$

EXPLANATION

We were given that,

$\csc(x) = \frac{5}{3}$

This implies that,

$\sin(x) = \frac{3}{5}$

We use the Pythagorean identity

$\sin^{2} (x) + \cos^{2} (x)= 1$
to get,

$\cos(x) = \sqrt{1 - ( { \frac{3}{5} })^{2}} = \frac{4}{5}$

We were also given that,

$\cos(y) = \frac{5}{13}$

This means that,

$\sin(y) = \sqrt{1 - {( \frac{5}{13}) }^{2} } = \frac{12}{13}$

This is because,

$0 < \: x \: < \frac{\pi}{2}$

$0 < \: y \: < \frac{\pi}{2}$

This angles are in the first quadrant so we pick the positive values.

$\tan(x + y) = \frac{ \sin(x + y) }{ \cos(x + y) }$

$\tan(x + y) = \frac{ \sin(x ) \cos(y) + \sin(y) \cos(x) }{ \cos(x) \cos(y) - \sin(x) \sin(y) }$

$\tan(x + y) = \frac{ \frac{3}{5} \times \frac{5}{13} + \frac{12}{13} \times \frac{4}{5} }{ \frac{4}{5} \times \frac{5}{13} - \frac{3}{5} \times \frac{12}{13} }$

$\tan(x + y) = - \frac{63}{16}$

The correct answer is D

4 0

3 years ago

plez help me it comes with 98 points ill even mark your answer as the brainliest plzz i really need the answer

Keith_Richards [23]

Answer:

a = 100

b = 5

Step-by-step explanation:

Just plug this into the equation it shows:

R(1) = (500 + (100)(1)) (50 - (5)(1))

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3 years ago

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IRINA_888 [86]

Answer:

Wow lol thats a lot of things also

Step-by-step explanation:

the answer is 768 dollars and 88 cents this is correct :)

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2 years ago