Pls help me x + y + H = 60 : perimeter , x, y and H be the two legs and the hypotenuse of the right triangle
(1/2)xy = 150 : area
x2 + y2 = H2: Pythagora's theorem.
3 equations with 3 unknowns.
(x + y)2 - 2xy = H2 : completing the square in the third equation.
x + y = 60 - H : express x + y using the first equation and use the second equation to find xy = 300 and substitute in equation 5.
(60 - H)2 - 600 = H2 : one equation with one unknown.
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In what form is the following linear equation written y=9x+2

An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.

Two friends are reading books. jimmy reads a book with 21,356 words. his friend bob reads a book with one-and-a-half times as many words. which expression represents the number of words bob reads?