Answer:
Earned = 160 + 20d
Explanation:
Seeing as Elmo works 20 hours per week at each job, that means he worked 20 hours at the $8 job and 20 hours at the $d job.
First find how much he earned from his $8/hr job.
(20)8 = 160
Elmo earned $160 at this $8/hr job.
Next, we know he earns $d/hr at his other job, and he works 20 hours at that job as well.
(20)d = 20d
Add the earnings from both jobs together.
160 + 20d = total earnings