a researcher is studying the effects of playing chess on memory improvement. he identifies 50 people who play chess and 50 people who do not. each of the 100 people is given a questionnaire designed to determine memory level. none of the 100 people who participated in the study knew they were part of a study. which statement is true.

Answers

Answer 1

Answer:

Observational study

Step-by-step explanation:

Just took the test


Related Questions

Tasha bikes two miles.
Cory bikes 2 times as far as Tasha
Kei bikes 2 times as far as cory
which exponential question represents the distance Kei bikes
A.2 2
B 3. 2
C 2. 4
D 2 3
btw all the second numbers are supposed to be tiny numbers

Answers

Answer: A?

Step-by-step explanation:

Answer:2^3

Step-by-step explanation:

I already named the shape I just need help solving for x​

Answers

Answer:

3 =x

Step-by-step explanation:

The sides are all equal length

x+5 = 3x-1

Subtract x from each side

x+5 -x = 3x-1 -x

5 = 2x-1

Add 1 to each side

5+1 = 2x-1+1

6 = 2x

Divide by 2

6/2 = 2x/2

3 =x

PLEASE HELP ASAP!!!!!!!!
Given the exponential function f(x) = 60(1.07)x, classify the function as exponential growth or decay and determine the percent rate of growth or decay.

Exponential growth, 60% increase
Exponential growth, 7% increase
Exponential decay, 7% decrease
Exponential decay, 60% decrease

Answers

Answer:

3rd

Step-by-step explanation:

Answer:

Exponential decay, 7% decrease

Step-by-step explanation:

44. Find the arc length on a circle with radius =5 inches and a central angle of pi/3 help plsss

Answers

Answer:

Step-by-step explanation:

Because your angle is in radians, I'm assuming we can use the pre-calculus version of the arc length formula which is

s = rt where s is the arc length, r is radians, and t is the angle in radian measure. Filling in accordingly:

[tex]s=5(\frac{\pi}{3})[/tex] so

[tex]s=\frac{5\pi}{3}[/tex] inches

whats the worlds biggest number ?

Answers

The biggest named number that we know is googolplex, ten to the googol power, or (10)^(10^100). That's written as a one followed by googol zeroes.

Have a Merry Christmas!

What is the measure of angle 1

Answers

Answer: 100

Step-by-step explanation:

It is an alternate interior angle.

The diagram shows a triangle.
76
P+49
P+13
What is the value of p?

Answers

What’s the 76 for is it part of that triangle also is p the missing angle ? I can help you but give me more details

Answer:

40

Step-by-step explanation:

76p+49p+13

=(76-49)p+13      [   plus (+) plus = minus(-)  ]

=27p+13

=40p or p=40 ans

Arc math problem

Thanks

Answers

Answer:

Option D

Step-by-step explanation:

17). Area of a sector of a circle = [tex]\frac{\theta}{360}(\text{Area of the circle})[/tex]

                                                  = [tex]\frac{\theta}{360}(\pi r^{2} )[/tex]

     Here 'r' = radius of the circle

     From the picture attached,

     r = 10 ft

     θ = 300°

    Area of the sector = [tex]\frac{300}{360}[\pi (10)^{2}][/tex]

                                    = [tex]\frac{5}{6}(100\pi )[/tex]

                                    = [tex]\frac{250\pi}{3}[/tex]

    Area of the sector = [tex]\frac{250\pi}{3}[/tex] ft²

   Therefore, Option (D) will be the correct option.

Answer:

area of greater arc/sector=300/360 ×πr²=5/6 ×π10²=250π/3 ft²

Find the value of y:

8y(4y+24)

Answers

Answer:

32y² + 192y

Step-by-step explanation:

First, we need to distribute 8y. This gets us 32y²+192y. I do not believe you can simplify that. I hope this helps!

That’s what i found

What is the slope of the line represented by the equation y = 4/5x - 3

Answers

Answer:

the slope 4/5x and the y intercept is -3

Step-by-step explanation:

Look at this graph: 100 90 80 70 60 50 40 30 20 10 Х 0 10 20 30 40 50 60 70 80 90 100 What is the slope?​

Answers

700 million trillion billion KABILLION could trillion billion reciprocal burst

In ΔEFG, e = 82 cm, ∠G=35° and ∠E=51°. Find the length of f, to the nearest 10th of a centimeter.

Answers

Answer:

105.3

Step-by-step explanation:

deltamath

If the mean of the four numbers 4, 8, 2x and
12 is 10, then x is

Answers

Answer:

8

4+8+2x+12=10*4

24+2x=40

2x=16

x=8

What is the point slope form of the line with slope that passes through the point (-4, - 7)?
y+4= (x + 7)
y-4= }(x-7)
y-7= (x - 4)
y+7= (x+4)

Answers

Third one because -7 is y and -4 is x

A bakery delivers a total of 2176 cookies equally to 8 coffee shops daily. How many cookies does the bakery deliver to each coffee shop in one week

Answers

Answer:

1904 cookies

Step-by-step explanation:

2176/8=272

272 is how many cookies a shop gets a day

272x7=1904

Hope this helps

sqrt((1, 476 + 274(341 - 48))/2)

Answers

is this the equation ??

You live on a triangular piece of land with a base of 121 yards and a height of 80 yards. The area of your land is
square yards.
fill in the blanks

Answers

Answer:

the area of the land is 4,840

Step-by-step explanation:

the equation for finding the area of a triangle is base x hight divided by 2

Flying against the wind, a jet travels 2480 miles in 4 hours. Flying with the wind, the same jet travels 7040 miles in 8 hours. What is the rate of the jet in still air and what is the rate of the wind?

Answers

Answer:

The speed of jet in still air is 750 miles per hour and speed of wind is 130 miles per hour.

Step-by-step explanation:

Given that:

Distance traveled by jet against the wind = 2480 miles in 4 hours

Combined speed = [tex]\frac{Distance}{Time}[/tex] = [tex]\frac{2480}{4}[/tex]

Combined speed = 620 miles per hour

Distance traveled with wind = 7040 miles in 8 hours

Combined speed = [tex]\frac{7040}{8}[/tex]

Combined speed = 880

Let,

Speed of jet = x

Speed of wind = y

When jet travels against the wind, the speed will be subtracted

x-y=620      Eqn 1

When jet travels with the wind, the speed will be added

x+y=880     Eqn 2

Adding Eqn 1 and 2

(x-y)+(x+y)=620+880

x-y+x+y=1500

2x=1500

Dividing both sides by 2

[tex]\frac{2x}{2}=\frac{1500}{2}\\x=750[/tex]

Putting x=750 in Eqn 2

750+y=880

y=880-750

y=130

Hence,

The speed of jet in still air is 750 miles per hour and speed of wind is 130 miles per hour.

✨a Pls help I will park you as brainlist promise ✨✨

Answers

A. I am pretty sure that is right

Answer:

answer is A

Step-by-step explanation:

8/3 =   2.66666 (about 3) miles an hour

You want to find miles per an hour as the unit rate, so divide the total miles CJ walks by how long it took him

Hope this helps! :))

Please graph! I have 3 minutes left of my timed test!

The graph of y = is translated. The translation is defined by (x + 1, y – 2).

Which is the graph of the translated image?

Answers

If the function is translated using the rule (x + 1, y – 2), the resulting function will be g(x) = (x+1)² -2

Translation of functions

Translation is a way of changing the position of a figure on an xy plane. Given the parent function

y = x²

If the function is translated using the rule (x + 1, y – 2), the resulting function will be g(x) = (x+1)² -2. The equivalent graph if the function is as shown  below.

Learn more on translation here: https://brainly.com/question/12861087

#SPJ1

In the given equation, k is a constant. If the equation has no solution, what is the value of k?

Answers

Answer:

0

Step-by-step explanation:

The value of constant 'k' will be [tex]\frac{1}{3}[/tex].

Given equation in the question is,

[tex]\frac{1}{3}\times (x-k)=kx[/tex]

Further solve the expression for the solution of the equation.

[tex]\frac{3}{3}\times (x-k)=3kx[/tex]

[tex](x-k)=3kx[/tex]

[tex]x-3kx-k=3kx-3kx[/tex]

[tex]x-3kx-k=0[/tex]

[tex]x(1-3k)=k[/tex]

[tex]\frac{x(1-3k)}{(1-3k)}=\frac{3kx}{1-3k}[/tex]

[tex]x=\frac{3kx}{(1-3k)}[/tex]

Since, equation has no value, denominator will be zero.

[tex]1-3k=0[/tex]

[tex]1=3k[/tex]

[tex]k=\frac{1}{3}[/tex]

     Therefore, Option (D) will be the correct option.

Learn more,

https://brainly.com/question/18595944

Complete the explicit formula for the sequence.

42, 47, 52, 57, 62, ...

Answers

Answer:

Step-by-step explanation:

67,72..

can somebody help me please?

Answers

Answer:

Domain = [tex](-\infty,6)\;\cup\;(6,\infty)[/tex]

Range = [tex](-\infty,1)\;\cup\;(1,\infty)[/tex]

vertical asymptote is at [tex]x=6[/tex]

Step-by-step explanation:

Domain is all the x values, with an asymptote, it is just a line that approaches a number but never reaches it. The vertical asymptote if you look at x, the lines look like the come from infinity on the left and right, try to reach 6 but can't.

So the interval notation for this is the union of all the numbers from negative infinity up to 6 but not including 6, and all the numbers from positive infinity up to 6 but not including 6.

Range is all the y values, with an asymptote, it approaches a number but never reaches it. The horizontal asymptote if you look at y, the lines look like the come from infinity on the top and bottom, try to reach 1 but can't.

So the interval notation for this is the union of all the numbers from negative infinity up to 1 but not including 1, and all the numbers from positive infinity up to 1 but not including 1.

f (x) = 3x + 5
Solve for x=5

Answers

Look at the attachment for work

At a sale, coats were sold for $76 each. If the coats originally cost $80 each, what percentage of its original price was a coat sold for?

Answers

5%, I hope this helps

Doors for the small cabinets are 19.5 inches long. Doors for the large cabinets are 2.7 times as long as the doors for the small cabinets. How many large doors can be cut from a board that is 10 feet long?

Answers

Answer:

2 Large doors

Step-by-step explanation:

Step 1

We convert 10 feet to inches

1 foot = 12 inches

10 feet = x

Cross Multiply

x = 10 × 12 inches

x = 120 inches

Doors for the small cabinets are 19.5 inches long. Doors for the large cabinets are 2.7 times as long as the doors for the small cabinets.

The length of Large doors = 2.7 × 19.5 inches

= 52.65 inches

Hence, the number of large doors can be cut from a board that is 10 feet long(120 inches long) is

= 120 inches/52.65 inches

= 2.2792022792 doors

Approximately = 2.3 doors

However, the number as to be in whole number, hence, only 2 Large doors can be cut from a board that is 10 feet long(120 inches long)

Mike and Thomas were making Lego towers. Mike stacked 249 Legos for his tower. Thomas had stacked twice as much as Mike. How many Legos did Thomas use for his tower? Write you answer in a complete sentence.

Answers

Answer:

498

Step-by-step explanation:

So,if mike stacked 249 legos and thomas did twice as much that means x2 so if you do 249 x2 you get 498.

Which quadrilateral has diagonals that are both congruent and perpendicular?

Answers

Answer:

Rhombu is the answer

Answeris rhombus

if i am on my side i am everything i you chop me in half i am nothing what am i

i know it i am just seeing who can get it

Answers

Answer:

the number 8

Step-by-step explanation:

Plz help I am getting timed

Answers

Answer:

4 hope this helps!

Step-by-step explanation:

The answer your looking for would be 4
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