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kvv77 [185]
2 years ago
14

(Pls help me)

Mathematics
1 answer:
Delicious77 [7]2 years ago
6 0

Answer:

\boxed{ \tt{in \:  a  \:  quadratic  \:  equation \: the \: highest \: power \:  is \: 2}} \\ \boxed{ \tt{hence \: she \: was \: not \: correct}}

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Please help me with 19 and 20
stiv31 [10]

Answer:

id have to see the chart to help you

i can see k which the answer for 19).is (0,-3)

but for 20 id have to see the chart

Step-by-step explanation:

if you add a picture of the chart i can help:)

4 0
2 years ago
A population is estimated to have a standard deviation of 9. We want to estimate the population mean within 2, with a 99% level
cupoosta [38]

Answer:

The sample required is  n = 135

Step-by-step explanation:

From the question we are told that

     The  standard deviation is  \sigma = 9

      The margin of error is E =  2

     

Given that the confidence level is  99%  then the level of  significance is mathematically evaluated as

         \alpha =  100-99

        \alpha =  1 \%

        \alpha =  0.01

Next we will obtain the critical value  \frac{\alpha }{2} from the normal distribution table(reference  math dot armstrong dot edu) , the value is  

             Z_{\frac{\alpha }{2} } =  Z_{\frac{0.05 }{2} } =  2.58

The  sample size is mathematically represented as

          n = [ \frac{Z_{\frac{\alpha }{2} } *  \sigma }{E} ]^2

substituting values

           n = [ \frac{ 2.58 *  9 }{2} ]^2

            n = 135

3 0
3 years ago
Help PLEASE!!!!!!!!!!!!
ValentinkaMS [17]
I think the last one
3 0
3 years ago
Which of the following indicates the subtraction property of equality when solving the equation 4(x + 9) + 5 = 3x − 8? Question
jeka94

Answer: 4(x + 9) = 3x − 8 − 5

Step-by-step explanation:

Hi, to answer this question we have to analyze the equation given:

4(x + 9) + 5 = 3x − 8

The subtraction property of equality states that if we subtract the same number from both sides of the equation, the equality remains.

So, if we subtract 5 from both sides:

4(x + 9) + 5-5 = 3x − 8 -5

4(x + 9) = 3x − 8 − 5  

Feel free to ask for more if needed or if you did not understand something.

8 0
3 years ago
‼️‼️‼️‼️‼️‼️‼️‼️‼️‼️‼️‼️Please someone find the kindness in their heart to help me please!
dezoksy [38]
The answer is 30
You multiply 2 x 30 which is 60 and 60 + 30 = 90
hope this helps :D
3 0
3 years ago
Read 2 more answers
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