If sin2a=1 then the value of sin2a-cos2a is

The probability that a student graduating from suburban state university has student loans to pay off after graduation is .60. if two students are randomly selected from this university, what is the probability that neither of them has student loans to pay off after graduation?

If x-1 and x+3 are the factors of x3+10x2+ax+b find a and b

If a line is defined by the equation y = 5x + 2, what is the slope?