Answer:
a
12=
−
3
n
2
−
n
Step-by-step explanation:
Answer: 2/561
Step-by-step explanation:
You have 36 possibilities for the first one
you have 35 possibilities for the second one
you have 34 possibilities for the third one
you have 33 possibilities for the last one
36*35*34*33
10*9*8*7= 5040
Answer:
C and D have the same volume
Step-by-step explanation:
For figures such as B, C, and D, with the top area is the same as the bottom area, the volume is the product of the base area and the height. The base area of all these figures is the same, so those (among B, C, and D) with the same height have the same volume.
C and D both have a base area of 20 cm^2 and a height of 5 cm, so both have the same volume.
___
For figures such as A and E, with a top area of zero, the volume is 1/3 the product of base area and height. If the heights of A and E were the same, they would have the same volume. The heights are different, so they don't.
None of the figures with non-zero top area have 1/3 the height of either A or E, so none are equal in volume to either of these.
i believe the answer is 13.85
let h= history books
science books = s
h=2s there are 2 times as many history as science so to get them equal we double the science
h+s=81 there are 81 total history and science books
2s+s=81 substitute 2s for h in the above equation
3s = 81 combine like terms
s = 27
There are 27 science books
h=2s
h=2(27)
h=54
there are 54 history books
