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3 years ago

A straight line is to a ruler as an angle is to: A. cosine B. two rulers C. protractor D. calculator

Mathematics

2 answers:

Lelechka [254]3 years ago

8 0

Answer:

Protractor

Step-by-step explanation:

You use a ruler to draw a straight line.

You use a protractor to draw an angle.

Dmitry [639]3 years ago

4 0

Answer: the answer is (C. protractor)

Step-by-step explanation: i took the test on k12 online school

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Using addition formula solve tan 15

salantis [7]

Answer:

2 - $\sqrt{3}$

Step-by-step explanation:

Using the addition formula for tangent

tan(A - B) = $\frac{tanA-tanB}{1+tanAtanB}$ and the exact values

tan45° = 1 , tan60° = $\sqrt{3}$ , then

tan15° = tan(60 - 45)°

tan(60 - 45)°

= $\frac{tan60-tan45}{1+tan60tan45}$

= $\frac{\sqrt{3}-1 }{1+\sqrt{3} }$

Rationalise the denominator by multiplying numerator/ denominator by the conjugate of the denominator.

The conjugate of 1 + $\sqrt{3}$ is 1 - $\sqrt{3}$

= $\frac{(\sqrt{3}-1)(1-\sqrt{3}) }{(1+\sqrt{3})(1-\sqrt{3}) }$ ← expand numerator/denominator using FOIL

= $\frac{\sqrt{3}-3-1+\sqrt{3} }{1-3}$

= $\frac{-4+2\sqrt{3} }{-2}$

= $\frac{-4}{-2}$ + $\frac{2\sqrt{3} }{-2}$

= 2 - $\sqrt{3}$

3 0

3 years ago

An isosceles triangle has two sides of equal length, a, and a base, b. The perimeter of the triangle is 15.7 inches, so the equa

Stella [2.4K]

Answer:

Please inform me if I am wrong

7 0

3 years ago

What is the average of the following numbers: 18, 64, 23, 78, 82, 91

Katen [24]

To Find The Answer, We Need To Add All Of Them Together, Then Divide By the Number Of Values. So:
64+23+78+82+91
-----------------------
5

<span>64+23+78+82+91 = 338.
</span>
338
-----
5

338/5 = 67.6

So, The Average Is 67.6

3 0

3 years ago

Solve this inequality for x.<br><br> 81 - 1 1/5x <_ 55

dsp73

Answer:

(61. 8181..., ~)

Step-by-step explanation:

-11/5x<-136

x>680/11

x>61. 8181...

6 0

3 years ago

Add. Write an integer or fraction in lowest terms.<br><br>7/8 +8/9

8_murik_8 [283]

Answer:

127/72

Step-by-step explanation:

7/8+8/9

63/72+64/72

127/72

8 0

3 years ago

Read 2 more answers