Answer:
If there is 1 at the top, then you have 1, then 2, then 3, etc.
total number of oranges equals:
1 + 2 + 3 + ... + 16 + 17 + 18 <-- stop at 18 because this is the number of oranges at the base
You can use the formula:
sum of first n numbers = n*(n + 1)/2
-->
18*19/2 = 9*19 = 171
or you can figure it out (basically derive the above formula):
you have:
1 + 18 = 19
2 + 17 = 19
3 + 16 = 19
...
How many pairs do you have? Well, it's just the number of numbers: 1-18 = 18 numbers (divide by 2) = 9 pairs)
9 pairs of 19 = 9 * 19 = 171
Hope this helps!
Step-by-step explanation:
Answer:
Step-by-step explanation:
90/15=6/z
6=6z
z=1
Answer:
51
Step-by-step explanation:
I just took the test and the answer is
we have chicken broth in cylindrical can.
we have given the height radius of cylindrical can.
h=10cm r=10 cm .
and she have 6cm broth height in the tin that means she had used 4 cm of height of broth .
now we need to find volume of two cylinder with h=10 cm and 6cm
and we need to find the difference between the volumes .
volume1=
volume 2=
volume used =volume 1-volume2=3140-1884=1256cm^3 is used
