Answer:
17
Step-by-step explanation:
If it costs $20 for the membership fee, then you can subtract that from the total monthly cost, giving you $25.50.
Then, you can divide this number by the price of each song to work out how many songs you downloaded, because you are simply rearranging the formula to work out the total price. $25.50 / $1.50 = 17.
X plus 4 -1x there, that's the next sequence
Steels is equal to x and plastic pipes is equal to y
5x + 50y = $1000
6x + 40y = $100