Answer:
1st one and 4th one
Step-by-step explanation:
Hope this helps if it does plz mark me brainliest
This is the number of combinations of 4 from 12
12C4 = 12!
----------
4! 8!
= 12*11*10*9 11*5*9 = 495
-------------- =
4*3*2*1
Answer:
84
Step-by-step explanation:
A= 1/2• bh
A= 1/2•24(7)
You just add the values for volunteers that worked 16-20 hours and 21-25 hours which would be 50 + 10 = 60. So the total number of volunteers that workers more than 15 hours is 60.