Rashad filled the bottom layer of a toy box with 15 wooden blocks he stacked 2 more wooden blocks on top of the bottom layer wha
2 answers:
Answer:
Step-by-step explanation:
The volume is define as:
In words, it's the product of the area of the base of the figure, and the height.
In this problem, each toy box is a unit cube in size, that is, .
So, one easier way to solve this, it's by counting the total number of blocks. In the base, there are 15 blocks, which are 15 cubic units. Then, Rashad places 2 more blocks on top of each block in the base, that is, 2 times 16, which is 30. So, in total, there are 30+15=45 blocks that forms the figure, if each block is 1 cubic unit, then the volume is
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Number of ways to select 3 books from 13 books for adoption is 286 .
<u>Step-by-step explanation:</u>
A Permutation is an ordered Combination. When the order does matter it is a Permutation. There are basically two types of permutation:
- Repetition is Allowed: such as the lock above. It could be "333".
- No Repetition: for example the first three people in a running race. You can't be first and second.
Formula is given by:
, where n is the number of things to choose from, and we choose r of them, no repetitions, order matters. Here , n=13 , r=3.
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∴ Number of ways to select 3 books from 13 books for adoption is 286 .