The answer is going to be 85.
Answer:
The product of sin 30° and sin 60° is the same as the the product of cos 30° and cos 60°.
<h2>
Explanation:</h2><h2>
</h2>
Here we need to write a function that models each variation, so we know that:
We also know that z varies directly with x and inversely with the product of r² and y. In other words, we can write z as follows:
Therefore, the model is:
Okay. So the song lasts 221 seconds. 45 seconds have already beem done and 22 seconds is done in an hour. The equation would be set up like this:
45 + 22h = 221
Just by looking at the answer choices, A is already eliminated because it doesn't incorportate the 45 seconds. B does include the 45 seconds, but it subtracts, and in this case, we add time, not subtract. D is eliminated, because the h variable does not go with 45. The only equation that works is C and when you solve it, you get 8 hours. The answer is C.
Note: you solve the equation above by subtract 45 from both sides to get 176 = 22x, and dividing both sides by 22 to get x = 8.