Answer:
-
Step-by-step explanation:
The cosine half-angle formula is
=±
we can write

as

=-
=-
=-
(cosine is negative is in second quadrant)
Answer:
B
Step-by-step explanation:
Answer:
X = 15+4Y
Step-by-step explanation:
The amount of money we can set as X
Since we dont know the amount of money she gets each hour we can set that to Y
Here's a trick. When you see the word "of", replace it with a times symbol. Whenever you see the word "is", replace it with an equals sign:
640% of 700 is
↑ <span>↑
</span> × or <span>· =</span>
Now convert 640% to a decimal so it can work in the problem
640% = 6.40
and multiply:
6.40 <span>· </span>700 = 4480