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Vitek1552 [10]
3 years ago
12

Find the 50th term of the sequence 5,-2,-9,-16

Mathematics
1 answer:
sattari [20]3 years ago
6 0

Answer:

50th term is -338

Step-by-step explanation:

Common difference d = -2-5 = -7

first term is a1 = 5

50th term

a50 = a1 + (n -1)d

a50 =  5 -7(50-1)

a50 = 5 -7(49)

a50 = -338

Hope this will helpful.

Thank you.

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======================================================

Explanation

(3pi/4) radians converts to 135 degrees after multiplying by the conversion factor (180/pi).

The angle 135 degrees is in quadrant 2. We subtract the angle 135 from 180 to find the reference angle

180-135 = 45

Then you can use a 45-45-90 triangle to determine that the ratio of opposite over hypotenuse is sqrt(2)/2

sine is positive in quadrant 2

------------

Alternatively, you can use a unit circle. Refer to the diagram below. In red, I've circled the angle 3pi/4 radians. The terminal point for this angle has a y coordinate of sqrt(2)/2

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