As said before, 160 is the correct answer
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Answer:
x = pi, 3pi, 5pi etc
x = -pi, -3pi, -5pi etc
Step-by-step explanation:
cos^2 x + 2 cos x + 1 = 0
replace cos x with m
m^2 + 2m +1 = 0
solve by factoring (this is a^2 +2ab+b^2 = (a+b)^2 where a =m and b=1)
(m+1)^2=0
take the square root of each side
m+1 =0
m=-1
now replace m with cos x
cos x = -1
take arccos of each side
arccos cos x = arccos (-1)
x = pi, 3pi, 5pi etc
17+4 = 21 the answer is 21
Step-by-step explanation:
A = P*e*r*t
P = 1,000
e = 2.71828
r = 0.09
t = 1
A = (1,000)*(2.71828)*(0.09)*(1)
A = 244.65
