Answer: 90
Step-by-step explanation:
set: {1, 2, 3, 4, 5, 6, 7} = 7 numbers | 3 even
no element may be used more than once in a number = distinct elements
and the number must be even = must finish with a even number.
This way, we should start with the last number, which we have 3 possibilities.
Since we have 7 numbers in total, we have 6 options for the first one and then 5 options for the second one.
So, we have 6.5.3 = 90
Trial and error specifies that you should guess the value of m and see if you aimed too low too high then adjust your next guess based on that.
Suppose we don't already know what m is (even though it is completely obvious), let's pick m to be 6,
So we check, 
but 
which means m must be bigger.
So we pick m to be 8 and check, 
but 
which means m must be smaller.
Since only natural number between 6 and 8 is 7 we pick m to be 7 and check, 
and 
.
The answer is therefore 7.
Hope this helps :)
Step-by-step explanation:
2×2.5x+2×8=11
5x+16=11
5x=11-16
5x=-5
x=-1
Answer: B) About 16% of the books have fewer than 150 pages
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