Answer:
Step-by-step explanation:
by the double angle identity for cosine.
Therefore, .
Now to finish the problem we just need to look at our handy dandy unit circle in the second quadrant.
It should say the -coordinate at is .
Answer:
i would go for the first one but im not entirely sure
i suggest you wait to see other people's answers
Answer:
they are supplementary
Step-by-step explanation:
49 = -7 (t + 1)
49 = -7t + 7
-7 -7
42 = -7t
÷ -7 ÷ -7
-6 = t
t = -7
C = 6.5h
for 2 hrs...so we sub in 2 for h...for francesca
c = 6.5(2)
c = 13
for 6 hrs...so we sub in 6 for h...for phil
c = 6.5(6)
c = 39
so Phil pays (39 - 13) = 26 more <=