It cost Andrew $21 to buy 7 binders. At this price, how much would it cost him to buy 4 binders?

Arectangle with an area of 47 m² is dilated by a factor of 7. what is the area of the dilated rectangle? enter your answer in the box. do not leave your answer as a fraction.

Formulate alisha has a number in mind. if she adds three to her number the result is less than five. use this information to write and solve an inequality about alisha's number. then graph the solution set.

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.