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3 years ago

8

Micheal is taking a survey of students at his high school to find out how many hours they work per week. He surveys all of the s

tudents in his freshmen English class. Is this good sampling method

1 answer:

yulyashka [42]3 years ago

6 0

No because that would just be measuring freshman a better sampling method would be surveying the same number of students for each grade

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What is the answer I’m confused if you can show the work that would be great

Ad libitum [116K]

Answer:

b

Step-by-step explanation:

I went through and tested each of the answers and it is b.

6 0

3 years ago

You fly a hot air balloon 3.5 miles above the ground. What is the measure of BD⌢, the portion of Earth that you can see? Round y

STatiana [176]

Answer:

$\Delta s \approx 334.545\,m$

Step-by-step explanation:

Let assume that Earth is a sphere, the following trigonometric diagram is constructed and presented below. The central angle is given by this inverse trigonometric equation:

$\theta = 2\cdot \cos^{-1} \left(\frac{r}{r+h} \right)$

$\theta = 2\cdot \cos^{-1}\left(\frac{4000\,mi}{4000\,mi+3.5\,mi} \right)$

$\theta = 4.792^{\circ}$

The distance of the portion of Earth that can be seen is:

$\Delta s = \frac{4.792^{\circ}}{360^{\circ}}\cdot (2\pi)\cdot (4000\,mi)$

$\Delta s \approx 334.545\,m$

7 0

3 years ago

Krystan has a cell phone plan that charges $0.09 per minute plus a monthly fee of $16.00. She budgets $34.00 per month for total

mart [117]

Answer:

200

Step-by-step explanation:

34-16=18/.09=200

5 0

4 years ago

Timothy built a base for a circular tabletop. The base can support a tabletop with a radius of at least 6 inches, but not more t

lilavasa [31]

Answer:

<em>The smallest possible are of the tabletop is </em><u>113 in²</u>

<em>The largest possible area of the tabletop is </em><u>1,662 in²</u>

Explanation:

1) What is the smallest possible area of the tabletop that will fit on Timothy’s table base?

The statement that the base can support a tabletop with a radius of at least 6 inches means that the radius has to be 6 inches or more, i.e. the smallest possible radius is 6 inches.

a) <u>Area of a circle: A = π r²</u>

The smallest area is given by the smallest radius, which we have just stated that is 6 in.

<u>b) Calculations:</u>

With that A = π (6 in)² = 36π in² ≈ 113.10 in².

Round the answer to the nearest whole square inch: 113 in²

2) What is the largest possible area of the tabletop that will fit on Timothy’s table base?

The statement that the base can support a tabletop with a radius no more than 23 inches means that the radius has to be 23 inches or less, i.e. the largest possible radius is 23 inches.

<u>a) Area of a circle: A = π r²</u>

The largest area is given by the largest radius, which we have just stated that is 23 in.

<u>b) Calculations:</u>

With that A = π (23 in)² = 529 π in² ≈ 1,661.9 in².

Round the answer to the nearest whole square inch: 1,662 in².

6 0

3 years ago

The 2th term of The A.P is 7 and 4th term is 28 Find The Common difference and The first term.

Kipish [7]

Answer:

d = 10.5, a₁ = - 3.5

Step-by-step explanation:

The n th term of an AP is

$a_{n}$ = a₁ + (n - 1)d

where a₁ is the first term and d the common difference

Given a₂ = 7 and a₄ = 28 , then

a₁ + d = 7 → (1)

a₁ + 3d = 28 → (2)

Subtract (1) from (2) term by term to eliminate a₁

2d = 21 ( divide both sides by 2 )

d = 10.5 ← common difference

Substitute d = 10.5 into (1)

a₁ + 10.5 = 7 ( subtract 10.5 from both sides )

a₁ = - 3.5 ← first term

8 0

3 years ago