Can someone me with these 2 questions?

In an equilateral triangle, each angle is represented by 5y+3. what is the value of y? a. 9.7 b. 10.8 c. 11.4 d. 7.2

Tatiana reads 40 pages of her book every night for x number of nights. write an expression that shows the number of pages she has read

Jessie and bob are financing $425,500 to purchase a house. they obtained a 30/8 balloon mortgage at 6.55%. what will their balloon payment be?