Which of the following are identities? Check all that apply. A sin 6x-2 sin 3x cos3x
B.
sin 3x
= 40sX-99cX
sin xcOSX
C. (sinx+cos x) = 1 * sin 2x
I D.
sin 3x - sinx
Elàng
c0s3x +C09x

The school that imani goes to is selling tickets to the annual dance competition. on the first day of the ticket sales the school sold 7 adult tickets and 5 child tickets for a total of $96. the school took in $40 on the second day by seling 3 adult tickets . find the price of an adult ticket and the price of a child ticket. solve by using substitution elimination college prep algebra math heres the 2 equations i came up with 7x+5y=96 and 3x+2y= -40 show all workiv be stuck on this.

Icould really use some with this question.

Liz had 140 pens and inna had 100 pens. after inna gave liz some pens, liz had 3 times as many pens as inna. how many pens did inna give liz?