Could the magnetic fields from power lines cause
leukemia in children? Investigators spent five
years comparing 638 children who had leukemia
and 620 who did not. They went into the homes
and measured the magnetic fields in the
children's bedrooms. This is an example of:
A. An Observational Study
B. A Controlled Experiment
C. A Survey

Answers

Answer 1

Answer:an observational study

Step-by-step explanation:


Related Questions

Write an inequality to represent the situation: A theater rents their space for $250 per night. If the company charges $8 per ticket, then what is the least number of tickets that must be sold in order to make a profit? PLEASE HELP! This is due tomorrow!

Answers

Answer: 32 tickets

Step-by-step explanation:

Since the theater rents their space for $250 per night and the company charges $8 per ticket, the least number of tickets that must be sold in order to make a profit will be:

= ($250/8)

= 31 1/4

The number gotten above is the number that'll bring about an Equilibrium. To make a profit the company must sell at least 32 tickets

7x - 2 (x + 1) + 18 = 8x - 11 what is the value of x

Answers

Answer:

x=9

Step-by-step explanation:

i hope this helps :)


[tex]x - 9 = \frac{3}{5}x[/tex]
please explain how you got the answer ​

Answers

x - 9 = 3/5x
*multiply by 5*
5x - 45 = 3x
2x = 45
x = 45/2
x = 22,5
The answer the person gave u is right

Which has a mass of about 10 kilograms?

Watermelon
Pencil
Car
Apple

Answers

Answer:

watermelon ..........................................

Answer: watermelon

Step-by-step explanation:

they usually weigh 9-11kg

an apple or pencil is less than 10kg, and a car is way more than 10kg

Please hurry!!!
Find m_c. Round the answer to the nearest hundredth.
A. 0.85°
B. 41.11°
C. 48.89°
D. undefined

Answers

Answer:

Sine = Opposite/Hypotenuse

Sine^-1 = 55/73

Angle = 48.89

Let me know if this helps!

Nathan and his children went into a grocery store and he bought $12 worth of apples and bananas. Each apple costs $1.50 and each banana costs $0.60. He bought a total of 11 apples and bananas altogether. By following the steps below, determine the number of apples, x,x, and the number of bananas, y,y, that Nathan bought.
Determine three ways to have a total of 11 apples and bananas:

Answers

Step-by-step explanation:

X= apple y=banana 1 apple cost $1.50 and a1 banana cost $0.60 nathan buy 11banana and apple 1.50×11 = 16.5 0.60×11= 6.6. 16.5 +6.6 =23.1

1. a circle has a circumfrance 88cm find its radius
2.a sector with angle 45 degrees has ab arc length 44cm find it radius and perimeter speratly
pls answer asap i will give u the brainliest

Answers

Step-by-step explanation:

Number 1

Circumference = 88cm

Circumference = 2πr

2πr = 88

πr = 88/2

πr = 44

22r/7 = 44

22r = (44 × 7)

r = (44 × 7)/22

r = 2 × 7

r = 14cm

Number 2

Length of arc = 44cm

Angle = 45°

L = ∅/360 × 2πr

44 = 45/360 × 2πr

44 = ⅛ × 2πr

44 = ¼ × πr

πr = 44 × 4

22r/7 = (44 × 4)

22r = (44 × 4 × 7)

r = (44 × 4 × 7)/22

r = 2 × 4 × 7

r = 2 × 28

r = 56cm

Perimeter = L + 2r

P = 44cm + 2(56cm)

P = 44cm + 112cm

P = 156cm

in algebra, we use a(n) to represesent a veriable

Answers

Answer:

Are you Algebra 1 or 2?

Step-by-step explanation:

yeahhh vgggrfsdtgbvv

For number 2:

If the figures below are similar, give the scale factor to Figure B to A.


PLEASE HELP!!!!!!!!

Answers

Answer:

3is the scale factor and it is similar

Step-by-step explanation:

what is the square root of 87 (round to the tenths place)

Answers

Answer:

I think it is 9.33 because the full answer is 9.327 so rounded it would be 9.33??

The diameter of a circle is 8 feet. What is the radius?

Answers

3 inches if you think abt it. :/

Answer All 5 and I will give you brainliest

Answers

Answer: Number 1 is B  Number 2 is D Number 3 is C  Number 4 is D Number 5 is A

Step-by-step explanation:

Find an​ nth-degree polynomial function with real coefficients satisfying the given conditions. If you are using a graphing​ utility, use it to graph the function and verify the real zeros and the given function value.
n=3
4 and 4i are zeros;
f(-1)=85

F(x) = ________

Answers

Givem that at n = 3: 4 and 4i are zero;

Then;

[tex](x - 4)(x - 4i)(x + 4i) \: (x - 4)( {x}^{2} - ( {4i)}^{2} \\ (x - 4)(x - 4i)(x + 4i) \: (x - 4)( {x}^{2} + 16) \\ (x - 4)(x - 4i)(x + 4i) \: {x}^{3} + 16x - {4x}^{2} - 64 \\ (x - 4)(x - 4i)(x + 4i) \: {x}^{3} - {4x}^{2} + 16x - 64[/tex]

Hence the function is:

[tex]f = {x}^{3} - {4x}^{2} + 16x - 64[/tex]

Jonah has a piece of string that is 70 inches long. He cuts the string into 6 equal pleces. How many Inches long is each piece of string?

Answers

If you do 70 divided by 6 it will equal 11.66666666666667

4/9 x 3/8 =

help please ​

Answers

Answer:

1/6

Step-by-step explanation:

Answer:

0.16666666

repeated

or≈0.17

Step-by-step explanation:

Does anybody know the answer to all of these?

Answers

Answer:10

Step-by-step explanation:

2+4+6+6+9+13+30=70

70 divided by 7= the mean should be 10

Answer:

the mode is 6 the median is also 6 the range is 28 the mean is 10

Step-by-step explanation:

help please and thanks

Answers

answer:
i’m not sure but i’m pretty sure that it’s
b and c

ASAP HELP PLEASE PLEASE

Answers

Answer:

2079

Step-by-step explanation:

is the correct answer 2079

The amount y (in dollars) that you earn by working x hours is represented by the equation y = 9x. A) What is the slope? B) What does the slope mean? Interpret! C) How much money would you make if you worked 40 hours?

Answers

Answer:

360 dollars

Step-by-step explanation:

Equation;

y = 9x

A) What is the slope?

The slope in an equation is the coefficient of the x variable. In this question, the slope is 9.

B) What does the slope mean? Interpret!

The slope shows the relationship between the x and y values.

This means that for every single unit change of x, y changes by 9 times.

C) How much money would you make if you worked 40 hours?

x = working hours

y = Amount

y = 9 (40) = 360 dollars

Which answer is correct?

9= 4 + 5 and 9 = 2 +7
9 = 5 + 5 and 9 = 6 + 4
9=6+3 and 9 = 7+1
9 = 5 + 3 and 9 = 6 +2

Answers

Answer:

9=4+5, 9=7+2, 9=6+3 are correct

Step-by-step explanation:

Anthony got a shipment of various box sets of albums, but
he doesn't have enough room on his shelves for all of
them. The box sets measure 1 inch, 0.5 inch,
1 inch, 0.5 inch, ž inch, 1
inch, and 1.5 inches. He can only display box sets that
are less than Şinch.

Answers

I’m not really sure but try adding everything you listed together to get your answe

Answer:

ccccccc

Step-by-step explanation:

need help on this picture ​

Answers

Answer:

The slope is -1/2

Answer:

-(1/2) or -0.5

Step-by-step explanation:

select two coordinates. for example, (2,2) and (4,1).

do (y2 - y1) ÷ (x2 - x1).

in this case, (1 - 2) ÷ (4 - 2). you should end up with -(1/2), or -0.5

what is the exterior angle of #9 ?

Answers

Answer:

55

Step-by-step explanation:

3x-12=2x

    +12

3x=2x +12

    -2x

x=12

4(12)+ 9

48+9

=55

Graph the linear equation. Can someone give me a helping hand I’m not sure how to answer this? I will mark as Brainliest

Answers

U do 1/3 x 6 = y you move the line

Answer:

Step-by-step explanation:

[tex]y = \frac{1}{3}x+6\\\\[/tex]

When x = 0 , y = 0 + 6 = 6    

(0 , 6)

When x = 3,

[tex]y = \frac{1}{3}*3 + 6 = 1 + 6 = 7[/tex]

(3, 7)

When x = -3

[tex]y =\frac{1}{3}*(-3)+6=-1 + 6 = 5[/tex]

(-3, 5)

Plot (0,6) ; (3, 7) and (-3, 5) in the graph and join the points.

help pleaseeeeeeeeeee

Answers

Answer:

I don't help ppl who just takes points from ppl with out helping :) Look at the past answers from her.

Step-by-step explanation:

Answer:

4, 7, 9, 12, 18, 32

Step-by-step explanation:

The sign shows that any number that is equal to, or more than, 36 is a valid answer. It can't be 3 because 3 x 9 is 27, and 27 is less than 36, so that wouldn't be true. 4 x 9 is 36, and 36 = 36, so that would be true, and obvoiusly all the other numbers that are over 4, when multiplied by 9, will equal more than 36, so they are all correct, except for the 3 and none answers. I hope this helps you out :)

Identify the solution set 2(-x -9) = -2x + 8

A) infinitely many solutions
B) Only one solution
C) No solution
D) impossible

Answers

Answer:

D) impossible

Step-by-step explanation:

What is the value of 5^-2?

Answers

Answer:

the answer is-25 according to me

5^-2 is -25
Please mark as brainliest

The wholesale price for a dozen pairs of socks is $4.30. The retail price for the same dozen pairs of socks is $9.25. What is the mark-up the retailer used? Write your answer as a complete sentence.

Answers

Answer:

the mark up used by the retailer is 115.12% of the wholesale price

Step-by-step explanation:

Mark-up is the percentage increase of the retail price over the wholesale price

Mark-up = (difference between retail and whole sale price / retail price ) x 100

difference between retail and whole sale price = $9.25 - $4.30 = $4.95

(4.95 / 4.3) x 100 = 115.12%.

pamela and donna flew to arizona and bought a t-shirt for $12, scarf for $6.50, and belt for $16.75. In arizona, the sales tax rate is 8.25%. what is the total sales tax on the items?

Answers

Answer:

$38.16

Step-by-step explanation:

$12 + $6.50 + $16.75 =

35.25 US$

Sale Tax: 8.25% or $2.91

After Tax Price: $38.16

A restaurant bill came to food total of $50 you want to leave a 20% tip for the server how much is the total bill

Answers

Answer:

20 percent of 50 is 10

Step-by-step explanation:

I THINK THATS IT I DONT REALLY KNOW

Answer:

$50×.20=10 50+10=$60 the total is $60

Other Questions
How much energy is lost as heat every time you eat a meal? Rebecca solved 45 + 2 20. Her answer was 5 5 . Is she correct? If not, explain and correct the error. Would you rather walk around with the feet of a giant or have a head of a babywhy?explain your choice Prometheus is a character that stole fire from the gods in Greek mythology. Which element is named from Prometheus? Plz plz plz plz plz pl 2.It took you 30 minutes (min) to walkfrom home to school with thedistance of 500 meters. What is theaverage speed? Use long division to find each quotient. Show your computation and write your answer as a decimal.a. 225 b. 78 the minimum charge the first 175 calls is rs 300 if the charge for each additional call is rs 350 how much is charge for 389 telephone calls When the door was left open, 36 pigeons flew the coop. If this was 40 percent of all the pigeons, how many pigeons were there originally? What did Henry Clay propose in the Compromise of 1850 to pacify both the North and the South? A.California would be a slave state, but the next state to join the Union would be a free stateB. California would be a slave state and Oregon would be a free stateC. California would be a free state and Congress would pass the Fugitive Slave LawD. California would be a free state, but slavery would be allowed in Kansas and Nebraska 24. The company is considering two independent projects with an initial cost of $18,000 each. The cash inflows of Project A are $3,000, $7,000, and $10,000 for Years 1 to 3, respectively. The cash inflows for Project B are $3,000, $7,000, and $15,000 for Years 1 to 3, respectively. The required return is 12 percent and the cutoff discounted payback period is 3 years. Based on discounted payback, which project(s), if either, should be accepted Find the length indicated please!! 8. Generally, why do people join a CERT?O A. To earn Citizen of the YearO B. To stay busyO c. To better prepare for hazards and protect themselves, loved ones, and their neighbors.O D. To put their Scouting knowledge and skills to use Rebecca does not want to work in a hospital so there are no jobs that would fit herin the Health Sciences Cluster-True-False Helpppppppppppppppp A cylinder has a base with a radius of 7 cm and a volume of 615.44 cm3. Use 3.14 for . Write and solve an equation to find the height of the cylinder. Dan bought a new computer for $900. Each year, the value of the computer decreased by 25% of the previous year's value. At this rate, what can Dan expect the approximate value of the computer to be after 8 years? Which type of infographic would you use to show a timeline of the Battles of the American Revolution? Ethan is developing a magazine ad. He writes an attention-getting headlineand body copy that will engage readers. He places the company's logo nearthe bottom of the ad. What is another basic part of print advertising that heshould consider including?A. A visual that supports the messageB. A storyboard to engage the audienceC. Interactive features to engage the audienceD. A script arranged in two columns an angle measures 66 less than the measure of its complementary angle. what is the measure of each angle