I do not know how to answer these questions, can someone explain what I would do to solve them?

Ahomeowner plans to hang wallpaper on one wall of a bedroom that is 10 feet long if a stripe of wallpaper is 20 inches wide and stripes or hung vertically how many stripes on wall paper with the homeowner required

An ulcer medication has 300 milligrams in 2 tablets. how many milligrams are in 3 tablets?

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+1