30 POINTS! Find an explicit formula for the geometric sequence −1,−7,−49,−343
d(n)=

Step-by-step explanation:

Since the sequence above is a geometric sequence

For an nth term in a geometric sequence

where

a is the first term

r is the common ratio

n is the nth term

To find the common ratio divide the previous term by the next term

That's

So the common ratio / r = 7

the first term is - 1

Substitute the values into the above formula

We have the final answer as

Hope this helps you

answer:  

step-by-step explanation:

here x represents the height of the pole,

and, the height of the shadow of the pole is 12 feet.

also, the angle of elevation from the top of the pole is 40°,

therefore,

by the low of sine,

which is the required equation for finding the value of x,

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