When x is next to 2 like that does that mean multiply?

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?

How is the equation of this circle written in standard form? x2 + y2 - 6x + 14y = 142 a) (x - 3)2 + (y + 7)2 = 200 b) (x+ 3)2 + (y - 7)2 = 200 (x - 6)2 + (y + 14)2 = 142 d) (x+6)2 + (y- 14)2 = 142

At noon a tank contained 10cm water. after several hours it contained 7cm of water. what is the percent decrease of water in the tank?