We have:

Then we use trigonometric identities to change the negative sign of the trigonometric functions, so:

We clear f(x):

we simply what we can:

Thus, the correct answer is;
Answer:
$720
Step-by-step explanation:
First tutor = 30 x 10 = $300
Second tutor = 30 x 14 = $420
Total = 420 + 300 = $720
1/6 = 1 batch, 2/6 = 2 batches and so on
if the factory used 1/2, the factory used 3/6 of a barrel, which equals to 3 batches.
<em>hope it helps :)</em>
50% - .5
7/15 - .46
the remote control car