If $26 represents the cost of the 5 used CDs, than your formula would be "26+4x" ,x being the amount of extra CDs you purchase.
The number CDs minus 5 is our x value, because the first 5 are the used CDs bundled into the $26 group.
26+4(6-5)
26+4(1)
26+4
30
6 CDs would cost $30
4/10 is equal to 4 out of 10 or 40%
This means you should shade 4 of the 10 blocks
-4x/5≥1/10
-8x≥1
x≤-1/8
x∈(-∞;-1/8]
Answer:
about 27 hours
actual number: 26.6666666667
Step-by-step explanation:
80 divided by 3
