What is the mean of this discrete random variable? (That is, what is E(X), the expected value of X?) A. 20
B. 18.59
C. 19
D. 19.625

Sarah used her calculator to find sin 125 degrees. she wrote down sin sin125 degrees.57. how could sarah recognize that her answer is incorrect?

What can each term of the equation be multiplied by to eliminate the fractions before solving? x – + 2x = + x 2 6 10 12

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2