He can buy at least 21 magnets
Step-by-step explanation:

Since 1/2 =2/4 = 4/8 = 5/10, only Mary drank less than half of her juice. 3/8 is less than 4/8
Answer: The period of the given function is 10
Step-by-step explanation:
The period of a function is the distance required to complete a full cycle (In which the portion of the graph repeats itself however in both direction)
Since, by the given diagram,
After 10 unit, the one cycle of the function is completed,
⇒ The period of the given function is 10.
36.1419423938
Good luck on your packet I just did this on mine