What is the number of square units in the area of trapezoid abcd with vertices a(0,0), b(0,-2), c(4,0), and d(4,6)?

Element x decays radioactively with a half life of 8 minutes. if there are 450 grams of element x, how long, to the nearest tenth of a minute, would it take the element to decay to 37 grams?

Suppose sat writing scores are normally distributed with a mean of 497 and a standard deviation of 109. a university plans to award scholarships to students whose scores are in the top 2%. what is the minimum score required for the scholarship? round your answer to the nearest whole number, if necessary.

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)