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N76 [4]
3 years ago
13

How many students had fewer than 5 buttons on their clothes. a:9 b:18 c:2 d:11

Mathematics
1 answer:
Bingel [31]3 years ago
3 0

Answer:

D) 11

Step-by-step explanation:

If you start at five and count back on each little x

than you should come up with 11

0=3

1=1

2=2

3=4

4=1

3+1+2+4+1=11

You do This because you need to find how many has fewer so you don't count 5

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Reuben runs 5 miles in 30 minutes. How many miles does he run per minute?
Irina18 [472]
1/6 of a mile per minute
8 0
2 years ago
Solve the system by substitution.<br> y=6x<br> y=3x+21<br> ( , )
Dimas [21]

Answer:

(7,42)

Step-by-step explanation:

Imput the 6x for the Y:

6x=3x+21

move the variable to the left

6x-3x=21

collect like terms:

3x=21

divide both sides by 3x and youll get this for X

x=7

Imput x=7 into the equation

Y=6x7

solve:

y=42

6 0
3 years ago
Raul is attempting to factor the expression 3x^2-14x-5. In his first step, he rewrites the expression as 3x^2+15x-x-5. Which of
Papessa [141]
It would be C and here's why:
you originally start with 3x² - 14x - 5.  The AC method to factoring says you have to get two middle terms that multiply to whatever 3 × -5 is and have to add to -14. Well 3 × -5 is -15. Raul chose two middle terms of 15x and -1x and 15 × -1 is -15 so that part is correct. However 15 - 1 = 14. The middle term of our original trinomial is -14 so "<span>The two middle coefficients multiply to the correct number, but do not add to the correct number."</span>
7 0
3 years ago
EU ons
wlad13 [49]

Answer:

B. -3

your question isn't clear

5 0
2 years ago
You are conducting a study to see if the accuracy rate for fingerprint identification is significantly different from 0.4. You u
Ludmilka [50]

Answer:

a)

<em>Calculated Z -value = 2 < 2.326 at 0.02 level of significance</em>

<em>Null hypothesis is accepted</em>

<em>The accuracy rate for fingerprint identification is not significantly different from 0.4.  </em>

<em>b)</em>

<em>P-value of this sample = 0.0455</em>

<em></em>

Step-by-step explanation:

<u><em>Step(i)</em></u>:-

Given sample size 'n' = 298

<em>Sample proportion </em>

<em>                             </em>p^{-} = \frac{x}{n} = \frac{136}{298} = 0.456<em></em>

<em>Population proportion </em>

                          p = 0.4

<u><em>Null hypothesis</em></u> :-

<em>The accuracy rate for fingerprint identification is not significantly different from 0.4</em>

<em>H₀: p=0.4</em>

<u><em>Alternative Hypothesis :-</em></u>

<em>The accuracy rate for fingerprint identification is  significantly different from 0.4</em>

<em>H₁: p≠0.4</em>

<u><em>Step(ii):</em></u>-

<em>Test statistic</em>

               Z = \frac{p^{-} -P}{\sqrt{\frac{P Q}{n} } }

             Z = \frac{0.456-0.4}{\sqrt{\frac{0.4 X 0.6}{298} } }

             Z = 2

<em>Given level of significance α=0.02</em>

<em>critical value Z = 2.326</em>

<em>Calculated Z -value = 2 < 2.326 at 0.02 level of significance</em>

<em>Null hypothesis is accepted</em>

<em>The accuracy rate for fingerprint identification is not significantly different from 0.4.  </em>

<u><em> P- value </em></u>

<em>P( Z>2) = 1- P( Z <2)</em>

<em>              = 1 - ( 0.5 - A(2)</em>

<em>             = 0.5 - 0.4772</em>

<em>            = 0.0228</em>

<em>Given two tailed test   = 2 ×P( Z >2)</em>

<em>                                       = 2 ×  0.0228</em>

<em>                                      = 0.0456</em>

<em>The p-value is 0.0456</em>

3 0
3 years ago
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