Question 874452
y = ax^2 + c
21 = 4a + c
<u>20 = a + c</u> Subtract
 1 = 3a
1/3= a  and c = 59/3 {{{60/3 - 1/3}}}
y = (1/3)x^2 + 59/3 one such parabola opening Upward  with V(0,19 2/3)