It would have changed by 1/3 is ur answer
Answer:
76, the middle one
Step-by-step explanation:
5 - (3 x -7)
5 - (- 21)
5 + 21
26
The answer is -25.8 because 5-10=-5, -5*5=-25, then you simplify fraction and add/subtract
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°