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Cerrena [4.2K]
3 years ago
12

Factorize

a {}^{2} - 9b {}^{2} " alt="a {}^{2} - 9b {}^{2} " align="absmiddle" class="latex-formula">
​
Mathematics
2 answers:
AleksAgata [21]3 years ago
4 0
1^2 (a-9b)

Not sure but hope it helps :)
lakkis [162]3 years ago
3 0

Answer:

(a - 3b)(a + 3b)

Step-by-step explanation:

a² - 9b²

(a)² - (3b)²

(a - 3b)(a + 3b)

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Stock prices fell 250 points one day and 60 points the next day. What is the average change in stock prices over the two days
arsen [322]

Answer:

the average change in stock prices over the two days is -155

Step-by-step explanation:

The computation of the average change in stock price over the two days is shown below:

= (-One day points - second day points) ÷ number of days

= (-250 points - 60 points ) ÷ 2 days

= -310 points ÷ 2 days

= -155

Hence, the average change in stock prices over the two days is -155

We simply applied the above formula so that the average change could come

3 0
3 years ago
A person has 20 coins consisting of dimes and quarters if the total amount of money is $4.70 how many quarters are there
aalyn [17]
18 quarters and 2 dimes
6 0
3 years ago
Which expression is equivalent to (-7m^4+15m^3-12m^2)+(3m^5-12m^4-7m^3)/m-6?
enyata [817]

Answer :  3m^6-12m^5-14m^4+15m^3-12m^2-6

7 0
3 years ago
How do i solve systems of equations by elimination?
stiv31 [10]
First make sure that one of the variable has the same coefficient in each equations. 

For example lets use:
y=x+3
2y=3x-1

Since neither the y's or x's are the same, we must multiply the equations to make them the same. I am going to multiply the first equation by 2 so I can eliminate the y's.

So we get:
2y=2x+3
2y=3x-1

Then we subtract the second equation from the first to eliminate the y's. So we end up with 0=-x+4 and now we solve for x
0=-x+4
x=4 

Now we plug in our x into either original to get the y-value. I am using the first
y=x+3
y=4+3
So the x=4 and y=7

Hope this helps!
6 0
3 years ago
Probability can never be equal to 154Probability can never be equal to 154
Agata [3.3K]

Answer: True

Step-by-step explanation:

The probability of an event occurring lies between zero and one. A probability of 0 means that the event has no chance of happening for example, rolling a die once and getting a number greater than 6 while a probability of 1 means the event will definitely happen for example, getting a number less than 7 when you roll a die once.

Every other probability falls in-between this range so probability can never be 154.

3 0
3 years ago
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