The school media specialist catalogued 2/3 of the new books in a shipment if she catalogued 52 books, what is the total number of ooks in the the shipment?

3x + 4y = 5 x- 3y = -7 solve by substitution

You eat $0.85 for every cup of hot chocolate you sell. how many cups do you need to sell to earn $55.25

Whoever gets this right gets the ! the half life of a soul smelling substance is 4 years. if you have 8 oz of this strange substance, how much of it will you have after 20 years? show work.