Question

TechWiz Electronics makes a profit of $35 for each MP3 player sold and $18 for each DVD player sold. Last week, TechWiz sold a combined total of 113 MP3 and DVD players.
Let x be the number of MP3 players TechWiz sold last week. Write an expression for the combined total profit (in dollars) TechWiz made from MP3 and DVD players last week.

Answer 1

Total number of MP3 and DVD players TechWiz sold last week 113
Number of MP3 players TechWiz sold last week = x
Then
Number of DVD players TechWiz sold last week = 113 - x
Amount of profit made by TechWiz on each MP3 player = $35
Amount of profit made by TechWiz on each DVD player = $18
Then
Total profit made by TechWiz
last week can be expressed as = 35x + 18(113 - x)
                                                  = 35x + 2034 - 18x
                                                  = 17x + 2034
I hope the answer and the process is clear to you.