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ser-zykov [4K]
3 years ago
12

Jennifer has 7 red marbles and blues marbles. how many marbles does she have?

Mathematics
2 answers:
Lostsunrise [7]3 years ago
6 0

For this case we must find the number of marbles that Jennifer has.

Let T be the variable that determines the number of total marbles that Jennifer has.

Let x be the variable that represents the number of red marbles that Jennifer has. So, x = 7

Let y, the variable that represents the number of marbles blues Jennifer has. So, y = 7

To find the value of T, we must add the variables x and y.

So, T = x + y

T = x + y

T = 7 + 7\\T = 14

So, Jennifer has 14 marbles.

Answer:

14 marbles


Grace [21]3 years ago
4 0
Jennifer has 14 marbles
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Kay [80]
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x/ (x-1 )  - 1/ (2-2x)
= -x/ -(1-x) - 1/(2-2x)    [see the similarity now? ]  [whatever we multiply for the denominator, as long as we multiply to the numerator, it will be ok]
= -2x / -(2-2x)    + 1/-(2-2x)
= (-2x+1 )/ -(2-2x)
=(2x-1)/(2-2x)
8 0
3 years ago
The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the reduction in systo
PIT_PIT [208]

Answer:

The  estimate is

             52.02  <  \mu  < 55.78

Step-by-step explanation:

From the question we are told that

    The sample mean is \ = x  =  53.9

     The sample size is  n =  24

      The standard deviation is  \sigma =  5.6

 

Given that the confidence level is  90% the level of significance is mathematically represented as

           \alpha  =  100 - 90

            \alpha  =  10 \%

            \alpha  =  0.10

Next we obtain the critical value of  \frac{\alpha }{2} from the normal distribution table.The value is  

           Z_{\frac{\alpha }{2} } =Z_{\frac{0.10 }{2} } =  1.645

The reason we are obtaining critical value of    \frac{\alpha }{2} instead of    \alpha is because    \alpha

represents the area under the normal curve where the confidence level interval (  1 - \alpha ) did not cover which include both the left and right tail while  

\frac{\alpha }{2} is just the area of one tail which what we required to calculate the margin of error

NOTE: We can also obtain the value using critical value calculator (math dot armstrong dot edu)

Generally the margin of error is mathematically represented as

          E  =  Z_{\frac{\alpha }{2} } *  \frac{\sigma }{ \sqrt{n} }

substituting values

         E  =  1.645  *  \frac{5.6 }{ \sqrt{24} }

          E  =  1.880

The  estimate of how much the drug will lower a typical patient's systolic blood pressure(using a 90% confidence level) is mathematically represented as

         \= x  -  E  <  \mu  <  \= x  +  E

substituting values

         53.9  -  1.880  <  \mu  <  53.9  +  1.880

         52.02  <  \mu  < 55.78

5 0
3 years ago
What number does x stand for in this equation?<br> -7X + 6= 27
Levart [38]

Answer:

x = -3

Step-by-step explanation:

-7X + 6= 27

Subtract 6 from each side

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divide each side by -7

-7x/-7 = 21/-7

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5 0
3 years ago
How do you subtract an integer from another integer without using a number line
Ymorist [56]
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3 years ago
3х2 = 147<br> Solve by undoing
Dmitry_Shevchenko [17]

Answer: +/- 7

Step-by-step explanation:

3x² = 147

To solve for x divide through by three first.

3x² = 147

x² = 49, now we take the square root of both side by trying to apply laws of indices.

√x² = √49

The square root will neutralize the effect of the square because

√a = a¹/² so (x²)¹/², and (x²)¹/² =

x²×¹/² = x, therefore the solution is

x = +/- 7.

3 0
3 years ago
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