If the math Olympiad club consists of 13 students how many different teams of 3 students can be formed for competitions

The volume of a sphere is increased by 6%. calculate the corresponding percentage increased in it area.

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

What is the area of the trapezoid shown