What kind of dimension does a point have?

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

The table shows the balance of a money market account over time. write a function that represents the balance y(in dollars) after t years.

If 1/√5+1/√5+1=p+q√r , find the values of p, q and r