3.) (1.012 X10-2) + (2.4X10-4)

Is this a polynomial function? i need to know asap

The following division is being performed using multiplication by the reciprocal find the missing numbers is 5/12 divided by x/3 equals 5/12 times x/10 equals 1/x

Which coefficient matrix represents a system of linear equations that has a unique solution ? options in photo*