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Komok [63]
3 years ago
9

6 erasers cost $6.60. Which equation would help determine the cost of 3 erasers?

Mathematics
1 answer:
nevsk [136]3 years ago
6 0

Answer:

the answer is D

Step-by-step explanation:

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What is the measure of ZB?​
r-ruslan [8.4K]

Answer:

b = 28

Step-by-step explanation:

131 + 21 + b = 180

152 + b = 180

b = 28

6 0
4 years ago
Perform the indicated operation.<br> (7 - 111) + (-3 + 5)
GREYUIT [131]
The answer to your question is -102
6 0
3 years ago
Dullco Manufacturing claims that its alkaline batteries last at least 40 hours on average in a certain type of portable CD playe
algol13

Answer:

The value is  p- value  = 0.041815

Step-by-step explanation:

From the question we are told that

  The  population mean is \mu  =  40 \ hours

  The  sample size is  n  =  18

    The  sample mean is  \= x =  37.8 \ hours

   The standard deviation is  \sigma  = 5.4\ hours

The null hypothesis is  H_o  :  \mu =  \ge 40

The alternative hypothesis is  H_a  :  \mu < 40 \ hour s

Generally the test statistic is mathematically evaluated as

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

      t=  \frac{37.8 - 40}{ \frac{5.4}{ \sqrt{18 } }

      t=  -1.73

From the z - table the p-value is obtained and the value is  

      p- value  =  P(Z <  -1.73)

        p- value  = 0.041815

3 0
4 years ago
Squaring both sides of an equation is irreversible. Is Cubing both sides of an equation reversible? Provide numerical examples t
nikitadnepr [17]

Answer:

<h2>Cubing both sides of an equation is reversible.</h2>

Step-by-step explanation:

Squaring both sides of an equation is irreversible, because the square power of negative number gives a positive result, but you can't have a negative base with a positive number, given that the square root of a negative number doesn't exist for real numbers.

In case of cubic powers, this action is reversible, because the cubic root of a negative number is also a negative number. For example

\sqrt[3]{x} =-1

We cube both sides

(\sqrt[3]{x} )^{3} =(-1)^{3} \\x=-1

If we want to reverse the equation to the beginning, we can do it, using a cubic root on each side

\sqrt[3]{x}=\sqrt[3]{-1} \\\sqrt[3]{x}=-1

There you have it, cubing both sides of an equation is reversible.

4 0
3 years ago
Can someone help please ?
ludmilkaskok [199]

Answer:

The answer is D.

8 0
3 years ago
Read 2 more answers
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