Answer:
1152-v
Step-by-step explanation:
Sin(a)=
To find sin(2a) = 2*sin(a)*cos(a), we ned to find cos(a)
We know that,
sin²(a) + cos²(a) = 1
cos(a) = 
cos(a) = 
Thus, cos(a) = +- 
We know a is in second quadrant and thus cos(a) is - because cosine is always negative in the second quadrant.
Therefore,
sin(2a) = 2*sin(a)*cos(a) = 
Answer: 78% of the markers are black
Step-by-step explanation:
1. Subtract the total of markers by the amount that are blue.
a. 32-7 = 25
2. Divide the amount of black markers by the total of markers
b. 25/32 = 0.78125
3. Make this number a percentage
c. 0.78125 x 100 = 78%
1. 8 because 8+8=16+1=17
2. 15 because 15-3=12
3. 5 because 5 times 3 =15 and 5times 2=10+5=15
4. 6 because 6times 2 =12 +2=14. And 6+8=14
5. 10 because 6times 10=60
6. 4 because 4+7=11 and 4times2=8+3=11
