If u risk a dollar to flip a coin heads 4 times in a row and are paid only 12 dollars if u win, how much are you being shortchanged by

Ametalworker has a metal alloy that is 30? % copper and another alloy that is 55? % copper. how many kilograms of each alloy should the metalworker combine to create 90 kg of a 50? % copper? alloy?

Find three consecutive numbers such that the sum of one-fourth the first and one-fifth the second is five less than one-seventh the third

The suare root of 9x plus 7 plus the square rot of 2x equall to 7