The mass of the blue copper sulfate crystal is two-thirds the mass of the red fluorite crystal. Write an equation you can use to find the mass m (in grams)of the blue copper sulfate crystal. plz :(

Solve the equation x/4 - 5= -8 -27 -12 -7 12

The first floor of marcus’ house is 1,440 square feet. he will cover 1,033 square feet with wood and the rest with tile. a box of tiles will cover 11 square feet. how many boxes of tile does marcus need to buy to cover the floor?

The ph level of a blueberry is 3.1 what is the hydrogen-ion concentration [h+] for the blueberry