Answer:
500,000
Step-by-step explanation:
The standard deviation for the combined assignment is 5 minutes.
To combine the standard deviations, we use:

With our information, we have:
Answer:
I believe it is D
Step-by-step explanation:
Hope this helps!
Answer:
x is the number of small cranes he can make
3x is the amount of time it takes to make all of those small cranes
10 is the amount of time it takes to make just the centerpiece
30 is how much time in total he has to make all of the paper cranes
Step-by-step explanation:
The answer will be 10 months till they're equal