9: B right
10: C obtuse
11: B right
12: B right
I hope they are right! Sorry if they are not!
Let's check.
x = 5π/24
4x = 5π/6
cos 4x = cos(5π/6) = cos 150° = -√3/2
cos² 4x = (-√3/2)^2 = 3/4
4 cos² 4x -3 = 4 (3/4) - 3 = 0
Answer: TRUE
The expression equivalent to the expression -90 - 60w is -30(3 + 2w), (-9 - 6w)10 and -20(4.5 + 3w)
We need to find the expressions that are equivalent to given expression
We solve the expression and check,
A) -30(3 + 2w)
-90 - 60w
Yes it is equivalent.
B) (-9 - 6w)10
-90 - 60w
Yes it is equivalent.
C) -3(30 - 20w)
-90 + 60w
No it is not equivalent.
D)(6 + 4w)15
90 + 60w
No it is not equivalent.
E) -20(4.5 + 3w)
-90 - 60w
Yes it is equivalent.
Therefore, The expression equivalent to the expression -90 - 60w is -30(3 + 2w), (-9 - 6w)10 and -20(4.5 + 3w)
To learn more about multiplication refer here
brainly.com/question/10873737
#SPJ4
B is probably gonna be the correct answer.
Answer:
4*4*4 = 4³
Step-by-step explanation:
Claire has 4 stamps.
Julia has 4 times as many as Claire or 4*4 = 4².
Damon has 4 times as many as Julia or 4*4*4 = 4³
