Enrique is 5 years younger than his sister, josefina. josefina is 15. how old is enrique?

What is the measure of x, in degrees

Abby is preparing fruit punch for her party. she starts with a bowl filled with liquid that has 1/2 fruit juice and 1/2 sprite, but she decides it's too fruity. so she pours out 1/4 of the liquid, and then fills the bowl up again with sprite. what fraction of the punch is now sprite?

What is sin 7x/4 ? i need on this urgent trig