Answer:
1. 0.30
2. 1.20
3. 7.50
Step-by-step explanation:
1. 0.30
2. 1.20
3. 7.50
Answer:
n(n-18)-81
Step-by-step explanation:
n^2-18n-81
=n(n-18)-81
I hope this helps!
The answer is 16x because if you add 10 and 2 you get 12 then add 4 you get is 16 but you need to multiply by x so you write it as 16x
1) local shopping mall
This is most relevant to spending habits. This would be where people would be spending money on a lot of different things and where their spending habits would show. It'd make the most sense to survey people there.
Answer:
Step-by-step explanation:
Recall the double angle identity for the sine of an angle:
Therefore, in order to find the , we need to find the cos of twice the angle , that is of
We need also to know in which quadrant the angle is, in order to have an idea whether to select the positive or the negative sign given by the formula. We notice that is smaller than . Therefore we are referring to an angle in the upper quadrants, where the sign function is positive. So we are going to go with the positive sign of the double angle formula.
Next, we need to study to assign a value to our answer:
So we look at , as seven times the angle (45 degrees), and make a diagram to guide us for the sign and exact numerical value of the cosine function of that angle (see attached picture). We notice that this angle resides in the 4th quadrant, therefore the cos is a positive number. And since we are dealing with one of the well known "special angles" for which we have exact numerical expressions, we can give the answer for :
Now we insert this numerical value into the half angle formula: