Answer:
5 different numbers, 2 even
Step-by-step explanation:
Since we have 5 digits and they are non repeating we can use the permutation formula:

It gives us the amount of ways to arrange k objects out of n objects without repetition, but order does matter.
In our case the amount of 4 digit numbers that can be formed using the digits from 1 to 5 is: 
And out of those 5, only 2 are even
 
        
             
        
        
        
Answer:
B. -4.
Step-by-step explanation:
 
        
             
        
        
        
14 volunteers will not be able to help.
Step-by-step explanation:
According to given statement;
One booth requires 3 Volunteers.
No. of booths = 16
Given number of volunteers = 62
We will multiply total number of booths with 3 to find the number of volunteers required. 
Volunteers required = No. of booths x 3
Volunteers required = 
Volunteers required = 48
Subtract the required volunteers from total volunteers;

14 volunteers will not be able to help.
Keywords: Subtraction, Multiplication.
Learn more about subtraction at:
#LearnwithBrainly
 
        
             
        
        
        
First simplify the square roots: 

Then simplify the last two terms: 

Since 61 is prime, you can't take a rational root out of it.