When 12 is divided by a certain number +1, the results is the same as when 21 is divided by the number +4 what is the number?

The suare root of 9x plus 7 plus the square rot of 2x equall to 7

Ibeg you to me 20. a reaction produces 4.93 l of oxygen, but was supposed to produce 1 mol of oxygen. what is the percent yield?

Use the squared identities to simplify sin^2x cos^2x