The answer is 3.9 x 10^-5
So firstly, I'm going to be converting the mixed number into an improper fraction. To do this, multiply the whole number by the denominator and then add that product with the numerator and that will be your new numerator. In this case:
3 × 8 = 24, 24 + 3 = 27. 
Now since they have the same denominator, you can subtract the numerators.

Now simplify the number as such:

<u>In short, your answer is -17/4, or -4 1/4.</u>
Hello from MrBillDoesMath!
Answer:
11.1
Discussion:
cos(42) = x / 15 => multiply both sides by 15
x = 15 * cos(42) => as cos(42) = .743 approx
x = 15 * (.743)
x = 11.15
Thank you,
MrB
The correlation coefficient would not change when the units of one of the variable are different in the two cases.
Is -2 the only point of reference given?