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Anna11 [10]
3 years ago
6

The trail is a loop that is 3/4 of a mile long. On Monday, Selma land the loop in 1/6 of an hour. What is selmas unit rate in mi

le per hour?
Mathematics
1 answer:
Dafna11 [192]3 years ago
4 0

Answer:

1/10

Step-by-step explanation:

3/4 add 1/6

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If cos(x)=1/4 what is sin(x) and tan(x)
algol13
Let us think about the trigonometric functions. If we have a right triangle with an angle we call x. Then we define the trigonometric functions as follows:

cos x = adj/hyp

sin x = opp/hyp

tan x = opp/adj

Where opp is the measure of the side opposite the angle x, adj is the measure of the side adjacent to angle x and hyp is the hypotenuse (the longest side).

We are told that cos x = 1/4 which means that the ratio of the side adjacent to the hypotenuse is 1/4. So let’s make adjacent = 1 and the hypoytenuse = 4.

We now have two sides of the right triangle but are missing the third. We use the Pythagorean theorem to find the third side. The Pythagorean Theorem says:

a^{2} + b^{2} = c^{2} where and b are the lengths of the legs of a right triangle and c is the hypotenuse. For our triangle c = 4, a = 1 and b is the side we don’t know. We could have made b = 1 and solved for a instead since a and b are both legs and can be used interchangeably.

So we end up with the following:
1^{2}+ b^{2}  = 4^{2} 
1+b^{2}=16
b ^{2}=15
b= \sqrt{15}

This means that the opposite side = \sqrt{15}

As a reminder:
opp = \sqrt{15}
Adj = 1
hyp = 4

Therefore we find sin x and tan x as follows:

sin x = opp/hyp = \frac{ \sqrt{15} }{4}

tan x = opp/adj = \frac{ \sqrt{15} }{1}= \sqrt{15}

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