What is the result when the number 86 is decreased by 50%?

Find the values of y: 3y^3(y^2+ 2/3y)=0

Weekly wages at a certain factory are normally distributed with a mean of $400 and a standard deviation of $50. find the probability that a worker selected at random makes between $450 and $500

Worth 30 points! in this diagram, both polygons are regular. what is the value, in degrees, of the sum of the measures of angles abc and abd?