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AnnyKZ [126]
4 years ago
14

Answer -7 x (-9) = ?Thank You!

Mathematics
1 answer:
artcher [175]4 years ago
5 0
   <span>-7 x (-9) = +63  

because  if we multiply  negative by negative we obtain +</span>
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6-3/8 I need help please
Daniel [21]

Answer:

5.625

Explanation:

3 0
3 years ago
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Use factoring to write an expression that is equivalent to 25b^16-64c^2
avanturin [10]
We can write this as the difference of squares:
(5b⁸+8c)(5b⁸-8c)

To write as the difference of squares, take the square root of each term first:
√25b¹⁶ = 5b⁸; √64c² = 8c

Now we write this as a sum in one binomial and a difference in the other:
(5b⁸+8c)(5b⁸-8c)
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3 years ago
What is the percent of change from 1,000 to 800?
Korvikt [17]

Answer:

20 percent

Step-by-step explanation:

the percent change is 20

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3 years ago
After standardizing a NaOH solution, you use it to titrate an HCl solution known to have a concentration of 0.205 M. You perform
Gnoma [55]

Answer:

The right answer is:

(a) 0.205

(b) 0.005425

Step-by-step explanation:

The given data is:

0.213, 0.204, 0.208, 0.200, and 0.198

(a)

The mean will be:

= \frac{Sum \ of \ all \ data}{No. \ of \ data}

= \frac{0.213+ 0.204+ 0.208+ 0.200+0.198}{5}

= \frac{1.023}{5}

= 0.2046

or,

= 0.205

(b)

The standard deviation will be:

\sigma^2=\Sigma\frac{(x_i-\mu)^2}{N}

    =\frac{(0.213-0.2046)^2+...+(0.198-0.2046)^2}{5}

    =\frac{0.0001472}{5}

    =2.994\times 10^{-5}

or,

    =0.005425

7 0
3 years ago
Solve the system of equations.<br> y=9x+17<br> y=x+49
gulaghasi [49]

Answer:

y = 10x + 66

Step-by-step explanation:

I don't know if this is how you wanted me to do it, there was not enough information for me to conclude if this was the correct way to do it. but I added 9x + x and whenever there is a variable without a number in front of it the variable = 1x or whatever the variable is. So 9x + 1x= 10x and 17+49= 66 so put it together and you get y= 10x +66

5 0
3 years ago
Read 2 more answers
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