Step-by-step explanation:
Use the chain rule.
Factor out -6x-4,
Know plug in x=-2 to evaluate the derivative
A radio station plays 3 1/2 minutes of commercials every 1/4 hour. At this rate, how many minutes of commercials does this radio
1 answer:
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Answer:
The nearby building is feet tall.
Step-by-step explanation:
The statue of liberty is 305 feet tall.
A nearby building is as tall as the statue of liberty.
To find the height of the building, you need to find of 305:
Thus, the nearby building is feet tall.
Answer:
The value of cos Ф is ±
Step-by-step explanation:
There are important rules for sin Ф and cos Ф
- sin²Ф + cos²Ф = 1
- sin²Ф = 1 - cos²Ф
- cos²Ф = 1 - sin²Ф
∵ sin Ф =
∴ sin²Ф =
∴ sin²Ф =
→ By using the third rule above
∵ cos²Ф = 1 - sin²Ф
∴ cos²Ф = 1 -
∴ cos²Ф =
→ Take square root for both sides
∴ cos Ф = ±
∴ The value of cos Ф is ±