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astra-53 [7]
3 years ago
9

8th grade math please help.

Mathematics
1 answer:
GuDViN [60]3 years ago
3 0

Answer:

angle 8 and angle 4

Step-by-step explanation:

angle 4 is the correct answer because it is the same as 8 but on the other side

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Write an equation of a line that passes through the point (3, 2) and is parallel to the line y = 3x - 4.
topjm [15]

Answer:

i think the answer is 21

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2 years ago
A stick l feet long is broken into two parts, one of which is twice as long as the other. How long is the shorter piece?
mezya [45]
Well, you really need to think on this one. The shorter piece can be four inches long. See, when you multiply four by two, you get eight. And when you add four and eight together, you get twelve inches, which is one foot.
6 0
3 years ago
Read 2 more answers
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
In a dass of 32 students there are 11 males. Find the ratio of males to females
Levart [38]

\huge{\boxed{11:21}}

First, find the number of females in the class. 32-11=21

Then, just write the ratio. \text{11 males:21 females}=\boxed{11:21}

3 0
3 years ago
$2,400 with a sales tax of 8%<br> How much is the total cost for the TV?
Lady bird [3.3K]
With 8% tax of $192, $2,592.
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