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Effectus [21]
3 years ago
14

A number plus the sum of the number and seven.

Mathematics
1 answer:
Dmitrij [34]3 years ago
8 0

Answer:

x+(x+7)

Step-by-step explanation:

sum=add all together

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A farmer paid $500 per month for deliveries over 10 months. For the other 2 months of the year, he paid $600 per
kati45 [8]

Answer:

500(10) + 600(2)

Step-by-step explanation:

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2 years ago
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Which of the following is a terminating decimal? A.10.3 never ending B.10 with the check mark C. 10.101 D.100.6 never ending
kirill [66]
C; terminating means it stops at a definite point
a is a repeating decimal, for b i think you mean radical of 10 and that’s irrational, and d is repeating
7 0
3 years ago
The number of popcorns sold at a movie theatre was 8 less than three times the number hotdogs. How many hotdogs did the theatre
serg [7]

Answer:

  200

Step-by-step explanation:

If the theater sold 8 more popcorns, the total would be 600, and it would be exactly 3 times the number of hotdogs. The theater sold 1/3 of 600, or 200 hotdogs.

6 0
3 years ago
You are scuba diving at
devlian [24]

Answer:

-10

Step-by-step explanation:

-8 feet minus 2 feet would equal -10 feet. It helps to think of it as a negative number instead, so it would be -8 ft + (-2) ft = -10 feet. Hope this helps!!

3 0
3 years ago
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5. A scientist believes the concentration of radon gas in the air is greater that the established safe level of 4pci or less. Th
zysi [14]

Complete Question

A scientist believes the concentration of radon gas in the air is greater that the established safe level of 4 pci or less. The scientist tests the composition for 36 days finding an average concentration of 4.4 pci with a sample standard deviation of 1 pci.

a) In testing the scientist's belief, write the appropriate hypotheses:

           H_o:                   Ha:

b) What decision should be made?

Answer:

a

The null hypothesis is  H_o :  \mu  \le  4 \  pci

The  alternative  hypothesis is H_a  :  \mu  >  4 \ pci

b

There is sufficient evidence to conclude that the concentration of radon gas in the air is greater that the established safe level of 4pci or less

Step-by-step explanation:

From the question we are told that

   The population mean is  \mu  =  4 \ pci

    The sample size n  =  36 \ days

     The  sample  mean is  \= x  =  4.4 \  pci

     The  standard deviation is  \sigma  =  1 \ pci

       The  level  of significance is  \alpha =  0.05

The null hypothesis is  H_o :  \mu  =  4 \  pci

The  alternative  hypothesis is H_a  :  \mu  >  4 \ pci

  Generally the test statistics is mathematically represented as

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

=>      t =  \frac{ 4.4  -  4 }{ \frac{ 1}{ \sqrt{36} } }

=>      t =  \frac{ 4.4  -  4 }{ \frac{ 1}{ \sqrt{36} } }

=>      t =2.4

The  p-value  is mathematically represented as

      p-value  =  P(Z >  2.4  )

From the  z-table  

          P(Z >  2.4  )  =  0.008

    p-value  =0.008

So from this obtained value  we see that

     p-value <  \alpha so we reject the null hypothesis

Hence we can conclude that there is sufficient evidence to conclude that the concentration of radon gas in the air is greater that the established safe level of 4pci or less

4 0
3 years ago
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