The expression given in the question is expressed as a power is x^10
According to the law of indices, multiplication of powers becomes addition as shown:

Given the following expressions;

This can also be expressed as:

This shows that the expression as power is x^10
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Answer:

Step-by-step explanation:
we are given
- Amplitude:7
- Period:9π
- Phrase shift:¼
remember that,

where A is the Amplitude
B is the Period
C is the Phase shift
D is the vertical shift
note that, since D isn't given we'll take it 0
altogether substitute:

hence,
our equation is

and we are done!
Answer:
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the answer would be 119.3 miles
The inscribed angle is half the measure of the intercepted arc:
142°/2 = 71°