Let's the number be x.
So, we need to find 25% of x is 19. Hence, we can set up the equation as following:
25% of x = 19
0.25 * x = 19 Since 25%= 25/100=0.25
x= 76
So, the number is 76.
Answer:
Step-by-step explanation:
Prime numbers are number that can only be divided by itself and 1.
E.g 2,3,5,7,11,13,17,19,23,29 etc.
So, note that this sequence doesn't have a pattern, it is neither Geometry Progression nor Arithmetic Progression.
Now, let take look at the model given
If n is prime, then 2n-1 is prime
Let take 5 for
n=5 is a prime number
2n-1=2(5)-1=10-1=9
9 is not a prime number so the model doesn't work
A prime number doesn't have sequence so, it cannot be model with sequence.
I hope this help
Answer can be simplified to 4.2
Answer:
The nth term for the arithmetic sequence is given by:
where,
is the first term
n is the number of terms and
d is the common difference for two consecutive terms.
As per the statement:
A certain arithmetic sequence has the following explicit formula for the nth term:
⇒ and d = 6
The recursive formula for the arithmetic sequence is given by:
Substitute the given values we have;
⇒the following recursive formula is,
Therefore, the number belongs in the blank space in the recursive formula is, 6