From 6x2−7xy+8y2 subtract the sum of x2−3xy−y2 and 2x2+5xy−4y2 ***every 2 in the problem is supposed to resemble -to the power of two- but it wouldn't let me type it like that.

If x = ∛200, which of the following inequalities is true? * 2 < x < 4 3 < x < 5 6 < x < 6.5 4.5 < x < 5.5 5 < x < 6

Sam claims that cos x =sin y if x and y are congruent angels. is sam correct ?

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $32.09. find the probability that a randomly selected bill will have an amount greater than $155, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?