If you flip a coin 20 times how would you find the theoretical probability of tossing tails?

Iwant to know what 3g+5h+4g-2h is my teacher is too selfish to tell us

Both the red and blue line segments stretch from the center of the circle to a point on the circle. the length of the blue segment is 5. how long is the red line segment?

Miguel’s teacher asks him to color 4/8 of his grid. he must use 3 colors: red, blue, and green. there must be more green sections than red sections. how can miguel color all the sections of his grid to follow all the rules