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Ilia_Sergeevich [38]
3 years ago
14

There are 11 books on a shelf. 3 of these books are new. The rest of them are used.

Mathematics
1 answer:
antiseptic1488 [7]3 years ago
4 0
Sooo , 8? Is there more to the question
You might be interested in
Determine whether the following statement is true or false. Justify your answer.
riadik2000 [5.3K]

Answer:

B. The statement is false. This is true only if θ is an acute angle in a right triangle.

Step-by-step explanation:

Trigonometric ratio formula can only be applied to define the relationship between the angles of a right triangle and its side lengths.

Therefore, it is impossible to define or find the tan θ of "any triangle". It only applies to right angled triangles.

In the case of a right triangle, given a reference angle, θ, tan θ = side lenght opposite to θ ÷ side lenght adjacent to θ (tan θ = \frac{opp}{adj}.

A right triangle has two acute angles and 1 right angle that which is 90°.

Therefore, we can conclude that:

"B. The statement is false. This is true only if θ is an acute angle in a right triangle."

3 0
3 years ago
For each ordered pair, determine whether it is a solution to y=-5x+2.
Sedbober [7]

There are two ways to do this.

The first is you plug in the x-value from the point in the table and see if that gives you the y-value from the same point.

For example, your first point is (5,49), so plug in x=5:

   y = -5(5)+2 = -25+2 = -23

Since that's not the y-value in (5,49), then (5,49) is not a solution for the equation.

The other option is you plug in both the x-value and the y-value to see if you get a true statement.  (A solution will make the equaiton a true statement.)

For example, the first point is (5,49), so you'd plug in x=5 and y=49:

    49 = -5(5)+2

    49 = -25 + 2

    49 = -23

Since that's not true, (5,49) is not a solution.

You'll notice you're basically doing the same thing, it's just whether you plug in one value or both and that's your choice.

8 0
3 years ago
Solve for 0 Round your answer to the nearest tenth.<br> 20<br> 13<br> A =<br> degrees
Nat2105 [25]

Answer:

1.835

Step-by-step explanation:

use pythagoras theorem to find missing side

use sin to find missing angle

missing side/13 = 1.835

8 0
3 years ago
Simplify. (-5) • (7) - (6) • (-2)
andrew11 [14]
Multiply (-5) and (7) together to get -35
Then multiply (6) and (-2) together to get -12

Finally multiply -35 and -12 together to get 420

So your answer to this is 420

Hope this helped :)
Have a good day
8 0
3 years ago
A bag has 30 tiles. Numbered 1-30. Perfect squares to non-perfect squares . Write ratio in simplest form .
Rudiy27

Answer:

Ratio = \frac{Perfect.squares}{non.Perfect.squares} = \frac{1}{5}

Step-by-step explanation:

The perfect squares from 1-30 are:

1, 4, 9, 16, 25

Total no. of perfect squares = five =5

Total no. of non perfect squares = 30-5 = 25

Ratio =\frac{Perfect.squares}{non.Perfect.squares} = 5 / 25 = \frac{1}{5}

3 0
3 years ago
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