Simplify 9 + 7 + n. n + 17 n + 16 16n
2 answers:
Answer:
B) n + 16
Step-by-step explanation:
We are given the expression 9 + 7 + n.
Here we need to simplify.
Simplify means we need to simplify the like terms.
Let's see what a like term is.
If we have the same variable with the same exponent, then they are called like terms.
The constants are the like terms, we can simplify them.
Examples:
2xy, -3xy are the like terms
are like terms
4, 5, -7, 8 are the like terms.
In the given expression 9 + 7 + n
The like terms are 9 and 7. There are in the operation of addition. So we can add them.
So, 9 + 7 + n
= 16 + n
This can be written as n + 16 by commutative property of addition.
Therefore, the answer is B) n + 16
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Answer:
Modification has not reduced the number of accidents.
Step-by-step explanation:
A B C D E F G H
Before modification 5 7 6 4 8 9 8 10
After modification 3 7 7 0 4 6 8 2
Difference -2 0 1 -4 -4 -3 0 -8
Mean of differences
Standard deviation of differences =
Formula of paired t test :
Df = n-1 = 8-1 =7
t critical> t calculated
So, We failed to reject null hypothesis
Hence modification has not reduced the number of accidents.