Luis earns a base salary of $150.00 every week with an additional 14% commission on everything he sells. luis sold $6050.00 worth of items last week.

So you want to know how much he has made in the last week. 
Okay first you know that he'll get 150 dollars because it's his fixed income. Now we have to see how much commission he has made. 6050.00 * 0.14 = $847

So if his fixed income is $150 and he made $847 from commission. The total amount of money he received is 150 + 847 = $997.

All except for b, because polynomial functions can be quadratic, cubic, witticisms and etc only non negative exponents of negative it is not a polynomial function