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3 years ago

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. y=6x y=3x+21 ( , )

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 "The two middle coefficients multiply to the correct number, but do not add to the correct number."

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:

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

Null hypothesis is accepted

The accuracy rate for fingerprint identification is not significantly different from 0.4.

b)

P-value of this sample = 0.0455

Step-by-step explanation:

Step(i):-

Given sample size 'n' = 298

Sample proportion

$p^{-} = \frac{x}{n} = \frac{136}{298} = 0.456$

Population proportion

p = 0.4

Null hypothesis :-

The accuracy rate for fingerprint identification is not significantly different from 0.4

H₀: p=0.4

Alternative Hypothesis :-

The accuracy rate for fingerprint identification is significantly different from 0.4

H₁: p≠0.4

Step(ii):-

Test statistic

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

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

Z = 2

Given level of significance α=0.02

critical value Z = 2.326

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

Null hypothesis is accepted

The accuracy rate for fingerprint identification is not significantly different from 0.4.

P- value

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

= 1 - ( 0.5 - A(2)

= 0.5 - 0.4772

= 0.0228

Given two tailed test = 2 ×P( Z >2)

= 2 × 0.0228

= 0.0456

The p-value is 0.0456

3 0

3 years ago