Hello:

how can i enter a plus-or-minus symbol into a ti-89? for latexjunkies, it's the \pm that i'm looking for.

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Kylie explained that (-4x+9)^2 will result in a difference of squares because (-4x+9)^2 (-4x+9)^2 =(-4x)^2+(9)^2=16x^2+81

Find the greatest common factor of -30x 4 yz 3 and 75x 4 z 2.

Jacob signs up to work for 2 1/2 hours at the school carnival. if each work shift is 3/4 hour, how many shifts will jacob work? (i just want to double check : |, for anybody that responds! : )