I need this done, please I need to pass these six weeks! Thanks

Solve for x i'll try to attach the files bc it's not letting me for some reason

How many credit hours will a student have to take for the two tuition costs to be equal? round the answer to the nearest tenth of an hour.

How much dextrose 70% must be mixed with dextrose 5% to prepare 1,000 ml of dextrose 20%?