A) 5n- 1
the patterns going up in 5s and to get back to 4 you need to - 1
First find unit price
$38/4 = $9.50 per DVD
6 DVDs * total cost = answer
6 * 9.50 = 57
Solution: 6 DVDs cost $57
Answer: 30
Step-by-step explanation:
16+6+18
The problem statement tells us ...
16 cm = 2.5 cm + (1/4)*(large gear diameter)
We can subtract 2.5 cm and multiply by 4 to find the large gear diameter.
13.5 cm = (1/4)*(large gear diameter)
54 cm = (large gear diameter)
The diameter of the larger gear is 54 cm.