Answer:
315 (D)
Step-by-step explanation:
210/60 to get donuts per minute = 3.5 donuts per minute
3.5x90= 315
Answer:
x = 2
Step-by-step explanation:
8x = 4x + 8
Subtract 4x from each side
8x-4x = 4x-4x + 8
4x = 8
Divide each side by 4
4x/4 = 8/4
x = 2
Answer:
8 and 3/29
Step-by-step explanation:
2.35 ÷ 0.29
2 and 35/100 ÷ 29/100
= 8 and 3/29
Answer: -1/2
Step-by-step explanation:
Use double-angle identities:
cos(2θ)=cos^2θ−sin2^θ
cos(2θ)=1−2sin^2θ
cos(2θ)=2cos^2θ−1
sin(x)=1/2
cos(2x)=1−2sin^2x=1−2(1/4)=1/2
cos(4x)=2cos2^(2x)−1=2(1/4)−1=-1/2
