Rolando, Anna, and Erika were collecting trivia cards. Rolando had 210 cards. Anna had twice as many cards as Rolando, and Erika had as many cards as Rolando and
Anna together. How many trivia cards did the three friends have altogether?

Thanh and her crew are building a stage in the shape of a trapezoid for an upcoming festival. the lengths of the parallel sides of the trapezoid are 14 ft and 24 ft. the height of the trapezoid is 12 ft.what is the area of the stage? enter your answer in the box. ft²

The equation of a parabola is given. y=18x2+4x+20 what are the coordinates of the focus of the parabola?

I’m not good at math can i have ? ?