Answer:
About 4 days
Step-by-step explanation:
Convert 39 and 42 degrees C to a z score and then use the z-table
25% because 21 is a quarter of 84. And 21 times 4= 84, so 21 is 25% of 84.
Answer: 20 ft³
Step-by-step explanation:
volume of triangular pyramid = 
- b = base area = 10 ft
- h = height = 6 ft
Therefore, the volume is:

Let m the tens digit and n the ones
the Original number is 10m+n
7(m+n) =10m+n
7m+7n=10m+n
6n=3m
Reversing the number 10n+m
10n+m=18+n+m
9n=18
n=2
6n=3m
6(2)=3m
3m=12
m=4
the number is 10m+n=10(4)+2=42