10. The product of 6 and 3 more than a number k is 48.

30

Step-by-step explanation:

k=30

6x3= 18

48-18= 30

*I think this is right*

a complex number is a number that can be expressed in the form a + bi, where a and b are real numbers, and i is a solution of the equation x2 = −1. because no real number satisfies this equation, i is called an imaginary number. has no real solution, since the square of a real number cannot be negative.