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Lunna [17]
3 years ago
12

Please help me???? I need ASAP

Mathematics
1 answer:
Assoli18 [71]3 years ago
4 0

Answer:

D

Step-by-step explanation:

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A math test is worth 100 points and has 30 problems.
mr_godi [17]

Answer:

I think 15

Step-by-step explanation:

15+15=30, so both 3 or 4 point questions have 15 problems each, hope this helped

3 0
2 years ago
F(X)=2x^2 +1 find and simplify:: if f(a) =19 find a.<br> Isn't a just 19??
liberstina [14]
2a^2+1=19\\&#10;2a^2=18\\&#10;a^2=9\\&#10;a=-3 \vee a=3
5 0
3 years ago
PLS ANSWER AND LOOK UNDER THE QUESTION TOO :)))
Sunny_sXe [5.5K]

D. (-2,-1)

Hope it helps you.

7 0
2 years ago
Read 2 more answers
A professor at a university wants to estimate the average number of hours of sleep the students get during exam week. The profes
balandron [24]

Answer:

The sample size is n = 2

Step-by-step explanation:

From the question we are told that

   The margin of error is  E =4.266

    The standard deviation is  \sigma = 2.539

From the question we are told the confidence level is  99% , hence the level of significance is    

      \alpha = (100 - 99 ) \%

=>   \alpha = 0.01

Generally from the normal distribution table the critical value  of  \frac{\alpha }{2} is  

   Z_{\frac{\alpha }{2} } =  2.58

Generally the sample size is mathematically represented as  

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

=>  n = [\frac{2.58  *  2.539  }{4.266} ] ^2

=>  n = 2

6 0
2 years ago
The price of a shirt is 18.50, but you have a coupon that lowers the price by 20%. What is the price of the shirt after using th
AURORKA [14]
The new price of the shirt is $14.8
8 0
3 years ago
Read 2 more answers
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