Please Simplify these expressions:
1. 2a + 10 - 6 + 4a
2. -7 + 3x - 5x + 7
3. -5(3b - 2) + 10b
4. -8 - 4d + 3b - 6 + d

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.

What is the image of c for a 90° counterclockwise rotation about a? (3, 7) (-1, 3) (7, 3)

0if x and y vary inversely and y=6 as x=7, what is the constant of variation?