Answer:
x=132°
Step-by-step explanation:
All four angles should add up to 360°
65°+86°+77°+x=360°
I got 132⁰ ans by adding all sides of no.
d) 303 8/9
4th term = ar^3 and 5th = ar^4 where a = first term and r = common ratio.
So ar^4 / ar^3
= r = 45/-15 = -3.
Working back,:
The first term a = ar^3/ r^3
= -15 / (-3)^3
= -15/-27
= 5/9
Sum of n terms = a * (r^n - 1)/(r-1)
= 5/9 * ((-3)^7 - 1 ) / (-3 -1)
= 303 8/9
