40 because 15×4 is 60 and there is 60 minutes in an hour
Answer:

Step-by-step explanation:
Any whole number can be made into a fraction simply by putting it over 1.
$4.30
Do ten times $3.57 and subtract it from $40
What questions I do not understand
Answer:
62
Step-by-step explanation:
44²=1936
1936×2=3872
≈ 62
A²+B²=C²