Explain why the function represented by the equation y=ax2+bx+c is quadratic only when a≠0.

Can someone me and plz do the problem

Bring the fraction a/a-4 to a denominator of 16-a^2

Acaterer charges $500 plus $30 per guest to cater a wedding. walt and traci don't want to spend more than $8000 on catering. write and solve an inequality in terms of the number of guests, g, that can be invited. a) 30g ? 8000; g ? 267 b) 500g < 8000; g < 16 c) 500 + 30g < 8000; g < 250 d) 500 + 30g ? 8000; g ? 250