Answer:

Step-by-step explanation:
Answer:
True; quadrants I & IV
Step-by-step explanation:
We know the relation between sine and cosine function which is given by

Let us solve this equation for cosine function.

Take square root both sides. When ever we take square root we need to write the solution in plus minus form



If Θ is in quadrants I and IV then the value will be positive and if Θ is in II and III quadrant then the value is negative.
Hence, if Θ is in quadrants I & IV, then we have

Thus, the correct option is: True; quadrants I & IV
Answer:
2p-30
Step-by-step explanation:
10p-40-8p+10
=2p-30
1) From the picture, we see that we have two vertical angles:

2) Now, because of the<em> "Vertical Angles Postulate"</em> from geometry, we know that angles A and B are equal, so equalling the angles and replacing by their expression from above, we get the following equation in terms of x:

3) We must solve the last equation for x, doing that we find:

Steps to solve the equation
0) We have the equation:

1) We want all the terms with x on one side, and the other on the other one. So we pass the term +3x to the right as -3x:

2) Now we pass the term -10 to the left as +10:

3) We sum the terms on each side:

4) We pass the 3 that multiplies the x on the right, dividing the 60 on the left:

5) Finally we make the division and we get:

Answer
x = 20
I think a but I said I think but iam not sure I looked it up its b