4. A sales assistant is paid commission of 3% on sales which she makes. During a certain week she sells $8000 worth of goods. If her basic weekly wage is $82, calculate her total earnings for the week. 5. An agent selling agricultural machinery is paid a basic wage of $120 per week. In addition he is paid a commission of 5% on sales that he makes. During one week he makes sales totalling $9000. Calculate the agent's total wage for this week.

step-by-step explanation:

x= -3 and

step-by-step explanation:

to find the roots of a cubic, use division or factoring to find the factors then set equal to 0. as this is a difference of cubes, it factors into

where a is the cube root of .

here   this is 27 and the cube root of 27 is 3. so we write using the form:

.

set each factor to 0 and solve for x.

x-3=0

x=3

the quadratic expression does not factor and must be solved using the quadratic formula.

where a = 1, b=3, and c=9

this cubic has two complex roots.

step-by-step explanation: