The sum of the first ten terms of A. P. 15,10,5,is

(a) -75 (b) -125 (c) 75 (D) 125

Step-by-step explanation:

First term(a)=15

Second term(t2)=10

Common difference(d)=t2-a=10-15= -5

Answer is -75

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 .