3 years ago

HELP ME IDK WHAT TO DO!!!

Mathematics

1 answer:

german3 years ago

8 0

Answer:

Step-by-step explanation:

alternate exterior angles

You might be interested in

Please help asap 20 points

Fudgin [204]

D would be the answer.

5 0

3 years ago

Which statement describes the changes that were made to the graph of f to make the graph of g

ira [324]

Answer:

hell

Step-by-step explanation:

5 0

3 years ago

I GIVE YOU 50 points for this question!

Alina [70]

Answer:

easy what's 5% of 3000 that's just for one year then multiple it by 4

4 0

3 years ago

Read 2 more answers

Find the exact value of cot(15degrees) using half angle formulas?

liubo4ka [24]

Double angle (or half angle, depending how you look at it) identities:

$\cos^2\dfrac x2=\dfrac{1+\cos x}2$

$\sin^2\dfrac x2=\dfrac{1-\cos x}2$

$\implies\cot^2\dfrac x2=\dfrac{\cos^2\frac x2}{\sin^2\frac x2}=\dfrac{1+\cos x}{1-\cos x}$

So we have

$\cot^215^\circ=\dfrac{1+\cos30^\circ}{1-\cos30^\circ}=\dfrac{1+\frac{\sqrt3}2}{1-\frac{\sqrt3}2}$

$\implies\cot^215^\circ=7+4\sqrt3$

$\implies\cot15^\circ=\sqrt{7+4\sqrt3}=2+\sqrt3$

Note that when taking the square root, we should take into account that that could yield two possible solutions, but we know $\cos15^\circ>0$ and $\sin15^\circ>0$ , so it's also the case that $\cot15^\circ>0$ .

Also, the reason we have equality in the last step can be explained like so:

$7+4\sqrt3=4+4\sqrt3+3=4+4\sqrt3+(\sqrt3)^2=(2+\sqrt3)^2$

(not unlike the process used to complete the square)

8 0

3 years ago

Read 2 more answers

Find the mean of the following,-6,-10,-4,8,9,-2,5,6.

andre [41]

$mean = \frac{sum \: of \: all \: observations}{number \: of \: observations} \\ = > mean = \frac{( - 6) + ( - 10) + ( - 4) + 8 + 9 + ( - 2) + 5 + 6}{8} \\ = > mean = \frac{6}{8} \\ = > mean = 0.75$

This is the answer.

8 0

2 years ago