Answer:
Step-by-step explanation:
I think it is D, I looked up the definition of each angles
Equation is
Q(x)=2000+200*cos(x*15°)
Q(0)=2000+200*cos(0°)=2200 students in 2000 year
Q(4)=2000+200*cos(60°)=2100 students in 2004 year
Q(16)=2000+200*cos(240°)=1900 students will be in 2016 year
1900 students would be in 2016 year..
You are basically asking 160% of X = 70.
1) 70 x 100 = 7000 (to turn the 70 into a %)
2) 7000 /160 = 43.75
You can reverse the equation to double check the answer.
160% x 43.75 = 70
It would be 820 because any number you have to round that ends in 4,3,2, or 1 will round down.