I'm not sure if this is what you're asking, but You said 70 Shoes and Pants. I'm not entirely sure if you mean 70 shoes and 70 pants, but thats how I'm goig to solve this problem.
70 + 70 = 140
140 + 42 = 182
<u>182 Packages</u>
The combined total profit is (17x + 2502) dollars
<em><u>Solution:</u></em>
Profit for each Mp3 player = $ 35
Profit for each DVD player = $ 18
Let x be the number of MP3 players sold last week
Number of MP3 players = x
Last week, Techwiz sold a combined total of 139 MPS and DVD players
Total number of mp3 and dvd sold = 139
Number of DVD player = 139 - x
<em><u>Write an expression for the combined total profit (in dollars) Techwiz made from MP3 and DVD players last week.</u></em>
Combined total profit = Number of MP3 players x Profit for each Mp3 player + Number of DVD player x Profit for each DVD player

Thus the combined total profit is (17x + 2502) dollars
Answer:
Domain - all real numbers except 0
Range - all real numbers
Step-by-step explanation:
The function will be undefined if x = 0, but apart from that, the function can take any value
Explanation is in the file
tinyurl.com/wtjfavyw