Answer:

Step-by-step explanation:
Since Θ is in fourth quadrant then cosΘ > 0, as is secΘ
Given
sinΘ = -
, then
cosΘ = 
=
=
= 
Hence
secΘ =
= 
A null hypothesis illustrates that two variables in the hypothesis have no statistical significance.
The null hypothesis is: 
The regression equation is given as:

The variables are:
and 
The null hypothesis states that, there is no statistical significance between
and
.
This is represented as:

Hence, the null hypothesis is: 
Read more about null hypothesis at:
brainly.com/question/16261813
Answer:
6 hours and 45 minutes
Step-by-step explanation:
First, convert 12 hours into minutes.
12*60=720
Convert 5 hours to minutes and add 15
5*60=300+15=315
Subtract 720 from 315.
720-315=405
Convert into hours and minutes.
405/60=6.75
0.75 of an hour is 45 minutes so the answer is 6 hours and 45 minutes.
No because when ever you multiply the same reciprocals you always end up with the number 1