Make y the subject of the formula y/x+2y/x+4=3

Acertain standardized? test's math scores have a? bell-shaped distribution with a mean of 520 and a standard deviation of 105. complete parts? (a) through? (c)

One card is dealt from a 52 card deck. find the probability that the dealt card is a 4 or a black 7

Marla bought a book for $12.95, a binder for $3.49, and a backpack for $44.99. the sales tax rate is 6%. find the amount of tax and the total she paid for these items