An investor has $1100 income from bonds bearing 4% and 5%. if the amounts at 4% and 5% were interchanged, she would earn $50 more per year. find the total sum invested.

1/3(x-10)=-4 solve for x with steps

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?

Logan wants to know how many skateboards have defective parts. he inspects 20,000 skateboards and keeps track of the number of defects per board. use his probability distribution table to find the expected value for defects on a skateboard.