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3 years ago

7

In a used book store, there are some different mystery novels on a shelf. Suppose there are 64 different ways to buy these novel

s, including not buying any of them. How many mystery novels are there on the shelf?

1 answer:

den301095 [7]3 years ago

5 0

Is this a riddle or actual math?

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arlik [135]

Given:

In a right angle triangle θ is an acute angle and $\tan\theta =\dfrac{3}{5}$ .

To find:

The value of $\cos \theta$ .

Solution:

In a right angle triangle,

$\tan \theta=\dfrac{Perpendicular}{Base}$

We have,

$\tan\theta =\dfrac{3}{5}$

It means the ratio of perpendicular to base is 3:5. Let 3x be the perpendicular and 5x be the base.

By using Pythagoras theorem,

$Hypotenuse=\sqrt{Perpendicular^2+base^2}$

$Hypotenuse=\sqrt{(3x)^2+(5x)^2}$

$Hypotenuse=\sqrt{9x^2+25x^2}$

$Hypotenuse=\sqrt{34x^2}$

$Hypotenuse=x\sqrt{34}$

In a right angle triangle,

$\cos \theta=\dfrac{Base}{Hypotenuse}$

$\cos \theta=\dfrac{5x}{x\sqrt{34}}$

$\cos \theta=\dfrac{5}{\sqrt{34}}$

Therefore, the value of $\cos \theta$ is $\dfrac{5}{\sqrt{34}}$ .

8 0

2 years ago

10 (2)+1(2)<br><br> how do u solve this problem?

Ilya [14]

Answer:22

Step-by-step explanation:

10x2+1x2=

20+2

=22

4 0

1 year ago

Read 2 more answers

Which polynomial expression represents a sum of cubes?

s344n2d4d5 [400]

I think it’s C
hope it helped

4 0

3 years ago

Solve for x 16x = 20(12)

marysya [2.9K]

Answer: X=15

Step-by-step explanation: Isolate the variable by dividing each side by factors that don't contain the variable.

Hope this helps!! :)

4 0

3 years ago

At a local river there were 48 alligators laying on the riverbank. if 5/6of the alligators were sleeping how many were awake

qaws [65]

8 alligator because is u divide 48/5 you get 40 and the remaining that r awake is 8

7 0

3 years ago