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3 years ago

15

A crew of highway workers paved 2/15 miles in 20 minutes if they work at the same rate what portion of a mile will they pave in

our hour

1 answer:

FromTheMoon [43]3 years ago

4 0

<span>The workers paved 2/5 miles in 1 hour =)</span>

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The t value for a 99% confidence interval estimation based upon a sample of size 10 is

Aliun [14]

Answer:
For a sample size of 10, the t-value is about 3.25 (from tables) at a 99% confidence interval.

Explanation:
When the standard deviation for the population is not known, the confidence interval estimate for the population mean is performed with the Student's t-distribution.
The confidence interval for the mean is calculated as
$(\Bar{x}- t\frac{s}{\sqrt{n}} , \, \Bar{x}+ t\frac{s}{\sqrt{n}}$
where
$\Bar{x}$ = sample mean,
s = sample standard deviation,
t = t-value (provided in tables),
n = sample size.

When reading the t-value, (n-1) is called the df or degrees of freedom.

7 0

3 years ago

Find the surface area of the equilateral triangular pyramid.

Tanzania [10]

C is the correct answer

good luck

8 0

4 years ago

Read 2 more answers

On a coordinate plane, triangles R S T and L M N are shown. Triangle R S T has points (5, 5), (2, 1), and (1, 3). Triangle L M N

ivolga24 [154]

Answer:

LMN has a larger area

Step-by-step explanation:

Given

RST

$R =(5,5)$

$S= (2,1)$

$T = (1,3)$

LMN

$L = (0,-1)$

$M= (2,-4)$

$N= (-2,-3)$

Required

Compare both areas

The area of triangle is:

$Area = \frac{1}{2}|x_1y_2 - x_2y_1 + x_2y_3 - x_3y_2 + x_3y_1 - x_1y_3|$

For RST, we have:

$Area = \frac{1}{2}|5*1 - 2*5 + 2*3 - 1*1 + 1*5 - 5*3|$

$Area = \frac{1}{2}|-10|$

Remove absolute signs

$Area = \frac{1}{2}*10$

$Area = 10$

For LMN, we have:

$Area = \frac{1}{2}|x_1y_2 - x_2y_1 + x_2y_3 - x_3y_2 + x_3y_1 - x_1y_3|$

$Area = \frac{1}{2}|0*-4-2*-1+2*-3--2*-4--2*-1-0*-3|$

$Area = \frac{1}{2}|-14|$

Remove absolute signs

$Area = \frac{1}{2}*14$

$Area = 7$

<em>By comparing both areas, we can conclude that LMN has a larger area</em>

3 0

3 years ago

Nick has $7.00. Bagels cost $0.75 each, and a small container of cream cheese costs $1.29. Write an inequality to find the numbe

jeyben [28]

Since the question only asks for bagels, put the cream-cheese idea aside.
The total spent has to be less than $7 so an equation can be this: $0.75x<$7 where x is the number of bagels

3 0

3 years ago

If a tabletop has a diameter of 35 inches, what is the approximate circumference of the tabletop? The answer choices are A 600 i

In-s [12.5K]

Answer:

B 110

Step-by-step explanation:

The formula for circumference is C= pi × d

(I couldn't find the symbol for pi)

You would plug in 35 for d to solve. You get a long decimal so you round it to 110.

So the approximate circumference for the tabletop is 110 inches.

3 0

3 years ago

Read 2 more answers