Convection - convection is heat transferral through fluids
Based on the computation done, the value of the combined gross monthly income is $7630.
Since there are four weeks in a month, Joe's income will be:
= 23.50 × 40 × 4
= 3760
The value of Zola's income will be:
= 21.50 × (40 + 5) × 4
= 21.50 × 45 × 4
= 3870
Therefore, the combined gross monthly income will be;
= $3760 + $3870
= $7630
Learn more about gross income on:
brainly.com/question/15530787
