Please help out with this answer

Step-by-step explanation:

hello,

arithmetic sequence means that you go from one term to the next one by adding or subtracting a constant value

check the first sequence

-20

-25

-30

-35

-40

each time 5 is subtracted

-20 - 5 = -25

-25 - 5 = -30

-30 - 5 = -35

-35 - 5 = -40

so the correct answer is the first one.

hope this helps

b is 38 degrees.

a is 52 degrees.

this is because if b is 38 and a is 14 degrees more than b than 38+14=52 and 52+38=90 degrees. hope this .