The complete factorized form for the given expression is 
<u>Step-by-step explanation:</u>
Step 1: Given expression:
Step 2: Trying to factor as a Difference of Squares
Factoring
As we know the theory that the difference of two perfect squares, 
can be factored into (A+B) (A-B)
from this, when analysing, 81 is the square of 9, 
is the square of 
. Hence, we can write the given expression as,
By using the theory, we get
Again, we can further factorise the term 
is the square of 
. Therefore, it can be expressed as below
Now, we can not factorise further the term 
. Because it will come as 
(3 is not a square term). Thereby concluding that the complete factorisation for the given expression is
Answer:
it is 40
Step-by-step explanation:
because 4 is in the tens place value off that number so then i think the answer is 40
Answer:
Number of month in first gym = 7
Number of month in second gym = 5
Step-by-step explanation:
Given:
First gym member ship cost = $75 per month
Second gym member ship cost = $50 per month
Total spending = $775
Computation:
Number of month in first gym = a
Number of month in second gym = b
So
a + b = 12....eq1
75a + 50b = 775 ....eq2
From eq 1 and 2
a = 7 month
b = 5 month
Number of month in first gym = 7
Number of month in second gym = 5
Answer:
Step-by-step explanation:
Pooled proportion
The hypothesis null would be
Alternate can be either not equal to or < or > according to need
Std error for difference of proportions
Hence test statistic = p difference/std error
= 
where p is given as above as combined proportion.
Answer:
1.5y - 5
Step-by-step explanation:
I used the distributive approach and distributed -1/2 to the -3y and 10.
(If you try this and it's incorrect, you may just need to distribute -1/2 to the 10, creating -3y - 5.)
