Which of the following statements about using a protractor are correct?

the protractor measures angles up to 90°.
the vertex of the angle must be at the 0° mark.
one ray of the angle must point at 0°.
the protractor measures angles that open from left or from the right.

Asap the total attendance for all of a baseball league in 2012 was about 7.5×107 fans, while the attendance for the tornadoes in 2012 was about 1.5×106 fans. about how many times more was the attendance for the entire baseball league than the attendance for just the tornadoes? 50 times more 10 times more 2 times more 5 times more

Solve the system of equations. y= 2x y= x^2 - 15

Standard deviation of 19,29,21,22,23