4673 to three significant figure

Pick the expression that matches this description: a polynomial of the 5th degree with a leading coefficient of 7 and a constant term of 6 (choice a) 7x^5+2x^2+6 (choice b) 7x^6−6x^4+5 (choice c) 6x^7−x^5+5 (choice d) 6x^5+x^4+7

An equation of the line tangent to y=x^3+3x^2+2 at its point of inflection is

James was playing a game with his friends. he won 35 points. then he lost 15, lost 40 and won 55. how did he come out