Use the figure. Help me answer this please

138°

Step-by-step explanation:

Check attatched file, hope it helps! :D

If you have any questions please ask <3

Note:

    I used 180 because a line is 180 degrees, so the line between angles 5 & 7 and 6 & 8 should be 180, so if we subtract angle 5 (which is equal to 1 if a || b) then we will get angle 7 :D

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= 5

step-by-step explanation:

to find the 15th term substitute n = 15 into the nth term formula

= (- 3 × 15 ) + 50 = - 45 + 50 = 5