Answer:
x + 79 = 90
x = 11 degrees
Step-by-step explanation:
We know that
applying the law of cosines
c²=a²+b²-2*a*b*cos C
in this problem
a=10 m
b=11 m
c=13 m
C=?
c²=a²+b²-2*a*b*cos C----> cos C=[a²+b²-c²]/[2*a*b]
cos C=[10²+11²-13²]/[2*10*11]----> cos C=0.2364
C=arc cos (0.2364)----> C=76.33°
the answer is
76.3°
Answer: Approximately 8.78 million
Step-by-step explanation:
Since the population is growing at a rate of 3.1% each year, that is synonymous to percentage increase
%increase = increase/initial population × 100
Or
(3.1 + 100)/100 × initial population = 9.05 million
= 1.031 × initial population = 9.05 million
Initial population = 9.05million/1.031
Initial population = 8.78 million