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defon
3 years ago
13

Please help fan and medal whatever you want. What are the factors of x2 − 81?

Mathematics
2 answers:
Liula [17]3 years ago
4 0
X^2-81
(x+9)(x-9)
x*x=x^2
x*-9= -9x
x*+9= 9x
^^^ These last two cancel each other out
+9*-9 = -81 (neg times pos is neg)
Left with (x^2-81)

I used * as a multiplication sign because an x is confusing when x is your variable
Look up the Box Method- It makes factoring easier!
Bas_tet [7]3 years ago
3 0
x^2-81=(x-9)(x+9)
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The screen on a computer monitor has a length of 15 inches and a width of 12 inches. What is the length of the diagonal to the n
Mekhanik [1.2K]

Answer:

19.2

Step-by-step explanation:

You use the pyth.

15^2+12^2=369

Then find the square root of 392 which is 19.2

I hope this helps! have a good day :)

5 0
3 years ago
Can some help me with my homework it’s number 5. 6. 7. 8. And 9.
BaLLatris [955]

Answers:

5. 296

6. 479

7. 801

8. 920

9. $281

Step-by-step explanation:

For 5-8, you add the 2 numbers. Line up the numbers by their place value.

For 9, it says she starts with $233. She worked for 6 hours today. She makes $8 for every hour. First, you have to find how much she made today. 6 hrs times $8 for every hr is $48. In total, she has $281 because we added the amount she starts with, and the amount she earned today.

4 0
3 years ago
Read 2 more answers
A tree is 7 ft tall when it is planted and this type of tree grows two feet per year. How tall will the tree be in 6 years? How
s344n2d4d5 [400]

2x+7=?

X=6

2(6)+7=

12+7=19

In six years, the tree will be 19ft

2x+7=44

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2x=37

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X=18.5

Thus, it will take 18 and a half years for the tree to reach 44ft

4 0
3 years ago
A shoe manufacturer was investigating the weights of men's soccer cleats. He felt that the weight of these cleats was less than
aleksklad [387]

Answer:

 The conclusion is that the researcher was correct

Step-by-step explanation:

From the question we are told that

     The sample size is  n =  13

    The sample mean is  \= x =  9.63

     The standard deviation is  s =  0.585

      The significance level is  \alpha  =  0.05

The Null Hypothesis is  H_o :  \mu = 0

The Alternative  Hypothesis  is  H_a =  \mu < 10

The test statistic is  mathematically represented as

          t =  \frac{\= x - \mu }{\frac{s}{\sqrt{n} } }

Substituting values

          t =  \frac{9.63  - 10 }{\frac{0.585}{\sqrt{13} } }

         t =  -  2.280

Now the critical value for \alpha is  

     t_{\alpha } = 1.645

This obtained from the critical value table

  So comparing the critical value of alpha and the test value we see that the test value is less than the critical value so the Null Hypothesis is rejected

 The conclusion is that the researcher was correct

 

 

6 0
3 years ago
A- 1/3 =2/3 what would a be
lubasha [3.4K]
Add 1/3 on both sides
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3 years ago
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