An element with a mass of 680 grams decays by 27.7% per minute. To the nearest
minute, how long will it be until there are 2 grams of the element remaining?

Me write an equation for the interior angles of this triangle that uses the triangle sum theorem

Write an equation of a line in slope intercept form that is perpendicular to the line 2x -3y = 12 and passes through the point (2, 6).

There are three bags: a (contains 2 white and 4 red balls), b (8 white, 4 red) and c (1 white 3 red). you select one ball at random from each bag, observe that exactly two are white, but forget which ball came from which bag. what is the probability that you selected a white ball from bag a?