If A is your age:
400 - 2A = 244
2A = 400 - 244
2A = 156
A = 78
A= bh divide by 2 so you'll multiply 10x8 the product would be 80 and so you divide 80 by 2 and get 40 as your result.
Polynomials can have double roots, in fact they're pretty common. if you get a reasonable zero it costs very little time to try it again for a double root. answer is the second choice
Concentric circles because if a line is tangent to one circle, it would only intersect teh other
