Out of 0 1 2 3 4 5 6 7 8 and 9 what is the number of possible outcomes

Find the area of the triangle formed by the origin and the points of intersection of parabolas y=−3x^2+20 and y=x^2−16.

Point r divides in the ratio 1 : 5. if the coordinates of e and f are (4, 8) and (11, 4), respectively, what are the coordinates of r to two decimal places?

Y+ 2/y is it a polynomial in one variable or not? and if so, why?