In △ABC, m∠A=50∘, m∠B=60∘, and m∠C=70∘. If △ABC is rotated 90∘ counterclockwise to △XYZ, what is the measure of angle Z?

Y=4x^2+x-1 solve using quadratic formula

Gretchen is setting up for a banquet. she has 300 chairs and needs to distribute them evenly among t tables. how many chairs should she put at each table? write your answer as an expression.

Which type of graph would allow us to quickly see how many students between 100 and 200 students were treated?