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2 years ago

HELP PLEASE??????????

Mathematics

1 answer:

Sladkaya [172]2 years ago

4 0

Answer:

Range: All real numbers or X∈R

Step-by-step explanation:

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You are hiking on a trail that leads to the top of a mountain. At 1 P.M. you reach an elevation of 4400 feet. At 4 P.M. you reac

shusha [124]

Let
t = time, hours
h = height, feet

At 1 PM, the time and height are respectively
t₁ = 1 hour
h₁ = 4400 feet

At 4 PM, the time and height are respectively
t₂ = 4 hours
h₂ = 5600 feet

By definition, the mean hourly change in elevation is
$\frac{h_{2} - h_{1}}{t_{2} - t_{1}} = \frac{5600-4400}{4-1} = \frac{1200}{3} =400$

Answer: 400 feet per hour

5 0

3 years ago

Read 2 more answers

A sporting goods store believes the average age of its customers is 38 or less. A random sample of 40 customers was surveyed, a

pashok25 [27]

Answer:

Test statistics = 2.85

P-value = 0.002

Step-by-step explanation:

We are given that a sporting goods store believes the average age of its customers is 38 or less.

A random sample of 40 customers was surveyed, and the average customer age was found to be 41.6 years and the standard deviation for customer age is 8.0 years.

Null Hypothesis, $H_0$ : $\mu$ <= 38 years

Alternate Hypothesis, $H_1$ : $\mu$ > 38 years

The test statistics we will use here is;

T.S. = $\frac{Xbar-\mu}{\frac{\sigma}{\sqrt{n} } }$ ~ N(0,1)

where, X bar = sample mean = 41.6 years

$\sigma$ = population standard deviation = 8 years

n = sample size = 40

So, test statistics = $\frac{41.6-38}{\frac{8}{\sqrt{40} } }$ = 2.85

At 5% level of significance, the z table gives critical value of 1.6449. Since our test statistics is more than the critical value of z so we have sufficient evidence to reject the null hypothesis and conclude that average age of its customers is more than 38 years.

P-value is given by, P(Z > 2.85) = 1 - P(Z <= 2.85) = 1 - 0.99781 = 0.002 .

4 0

4 years ago

The equation is________ Solve the equation x=________

Komok [63]

Answer:

7x-5 = 9

x = 2

Step-by-step explanation:

Let x be the number

7x-5 = 9

Add 5 to each side

7x-5+5 = 9+5

Divide each side by 7

7x = 14

7x/7 = 14/7

x=2

5 0

3 years ago

Please help!!!!! Split using partial fraction decomposition

Rama09 [41]

Answer:

Step-by-step explanation:

6 0

3 years ago

WEILL GIVE BRAINLIEST! Translate into a variable expression. n less than 22

Vikentia [17]

Answer:

n<22 or 22- n

Step-by-step explanation:

4 0

3 years ago