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2 years ago

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Three numbers add up to 27. The third number is twice the second number. The first number minus the third number is equal to 2.

What is the first number?

1 answer:

alexira [117]2 years ago

7 0

The answer would be: 6.75+6.75+13.5=27

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2) (-8)

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A relay race has 4 runners who run different parts of the race. There are 16

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A student group claims that first-year students at a university must study 2.5 hours (150 minutes) per night during the school w

AlekseyPX

Answer:

We have strong evidence that on average, students study less than 150 minutes per night during the school week

Step-by-step explanation:

Normal distribution:

mean μ₀ = 150

Sample:

Sample size n = 272

Sample mean x = 141

Sample standard deviation s = 66

The standard error of the sample mean SE = σ /√n

SE = 66/√272

SE = 66 / 16,49

SE = 4

Test Hypothesis:

Null hypothesis H₀ x = μ₀

Alternative hypothesis Hₐ x < μ₀

z(s) test statistics is:

z(s) = ( x - μ₀ ) / s/√n

z(s) = - 9 /4

z(s) = - 2,25

p-value for that z(s) p-value = 0,0122

Then for α = 0,05 p-value < 0,05

We are in the rejection region we need to reject H₀

7 0

2 years ago

Someone help me

Aneli [31]

Answer:

see the explanation

Step-by-step explanation:

we know that

The circumference of a circle is equal to

$C=\pi D$

where

D is the diameter

In this problem we have

$C=2.88\ in$

$\pi=3$

substitute and solve for D

$2.88=(3)D$

$D=2.88/3$

$D=0.96\ in$

we know that

The length of the row of quarters is equal to multiply the diameter of the quarter by the number of quarters in the row

so

For 4 quarters in the row, the length is equal to --> $0.96(3)=3.84\ in$

For 6 quarters in the row, the length is equal to --> $0.96(6)=5.76\ in$

For 12 quarters in the row, the length is equal to -> $0.96(12)=11.52\ in$

6 0

2 years ago