Answer: ABCD is not a trapezoid.
Step-by-step explanation:
Answer:
let y=the inner missing angle
y+x+31=180
y+(2x-8)=180
and combine the two
2x-8-x-31=0
x=39
Step-by-step explanation:
31% × y = 89,9
y = 89,9 × 100/31
= 290
Therefore 31% of 290 is 89,9
Answer:
From this info and using the empirical rule we know that we will have about 68% of the scores between:
95 % of the scores between:
And 99.7% of the values between
Step-by-step explanation:
For this problem we can define the random variable of interest as "the student grades" and we know that the distribution for X is given by:
From this info and using the empirical rule we know that we will have about 68% of the scores between:
95 % of the scores between:
And 99.7% of the values between
Answer:
A nice way to show it is through the unit circle.
In the unit circle, the point at angle theta from the origin has a y value of sin theta.
If you rotate a point 360-theta degrees from the origin, that is like rotating it theta degrees "backwards", or downwards, which is going to yield the same exact point, reflected through the x-axis. In other words, the y value, or sin(360-theta), is exactly -sin(theta).