Find sin 2x, cos 2x, and tan 2x if tan x = 3 and x terminates in quadrant I

Ben bowled 124 and 188 in his first two games. what must he bowl in his third game to have an average of at least 160?

X/y + 4y/x divided by x/y - 2y/x explain as in depth as you can how you simplfied the fractions. i don't know where to start on this : /

Aband wants to create a cd of their last concert. to creat the cds, the cost will be $350 advertisement fee plus $3 per cd.write an inequality that represents how many cds they can buy with a maximum of $1225.solve the inequality