Answer:
the 4 main types of bias in research – sampling bias, nonresponse bias, response bias, and question order bias – that are most likely to find their way into your surveys and tamper with your research results
Step-by-step explanation:
.-.
What is the slope of a line perpendicular to the line whose equation is
15x + 9y = 189. Fully reduce your answer.
We want to find the slope of a line perpendicular to 15*x + 9*y = 189.
The slope of the line perpendicular to the given line is 9/15.
First, a general line written in the slope-intercept form is written as:
y = a*x + b
Where a is the slope and b is the y-intercept.
And two lines are perpendicular if one has a slope that is equal to the inverse of the opposite of the other line's slope.
So, to find the slope of the line perpendicular to 15*x + 9*y = 189, first, we need to find the slope of this line.
To do it, we need to isolate y.
9y = -15x + 189
y = (-15/9)*x + 189/9
So the slope is -15/9
A perpendicular line to this must have a slope equal to the inverse of the opposite of this, so the slope of the perpendicular line is:
-(-9/15) = 9/15
The slope of the line perpendicular to the given line is 9/15.
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There are 270 students at Colfax Middle School, where the ratio of boys to girls is 5:4. There are 180 students at Winthrop Middle School, where the ratio of boys to girls is 4:5. The two schools hold a dance and all students from both schools attend. What fraction of the students at the dance are girls?
Given:
Total number of students at Colfax Middle School = 270
Ratio of boys to girls is 5:4.
Total number of students at Winthrop Middle School = 180
Ratio of boys to girls is 4:5.
The two schools hold a dance and all students from both schools attend.
To find:
The fraction of the students at the dance are girls
Solution:
There are 270 students at Colfax Middle School, where the ratio of boys to girls is 5:4.
[tex]5+4=9[/tex]
Number of boys [tex]=270\times \dfrac{5}{9}=150[/tex]
Number of girls [tex]=270\times \dfrac{4}{9}=120[/tex]
There are 180 students at Winthrop Middle School, where the ratio of boys to girls is 4:5.
[tex]4+5=9[/tex]
Number of boys [tex]=180\times \dfrac{4}{9}=80[/tex]
Number of girls [tex]=180\times \dfrac{5}{9}=100[/tex]
Now,
Total number of students in both schools [tex]= 270+180[/tex]
[tex]= 450[/tex]
Total number of girls in both schools [tex]= 120+100[/tex]
[tex]= 220[/tex]
The fraction of the students at the dance are girls is
[tex]\text{Required fraction}=\dfrac{\text{Total number of girls in both schools}}{\text{Total number of students in both schools}}[/tex]
[tex]\text{Required fraction}=\dfrac{220}{450}[/tex]
[tex]\text{Required fraction}=\dfrac{22}{45}[/tex]
Therefore, the required fraction is [tex]\dfrac{22}{45}[/tex].
Use the grid to create a model to solve the percent problem.
21 is 70% of what number?
Answer:
the answer should be 30!
Step-by-step explanation:
The area of a rectangular raised garden bed for growing beets is given by the expression (3b)(3b-3) The length, l, of the mat is greater than its width, w.
Based on the given information and the formula for area of a rectangle, which of the following statements must be true?
Select all that apply.
Diagonals of a parallelogram ABCD intersect at O. If∠BOC = 90º and ∠BDC = 50º, then ∠OAB is (A) 90º (B) 50º (C) 40º (D) 10º
Answer:
diagonals
lf= Boc =90°
Bcd = 50°
QAB (A) ? jadi jawaban nya
(D). 10°
Step-by-step explanation:
Diognals of a Parallegram ABCD intersat at o
lg and then is.
"sorry ya kalo jawaban nya salah "
Please help! i dont understand
Answer:
3x2>n+2x7>n
Step-by-step explanation:
from what I understand, you're suppose to write what's its saying in numbers. so you have to write three times two more than the number n in numbers then add that expression with two times seven more than the number n. I hope I helped
There are 24 calories in a candy bar. How many calories are there in 33 candy bars ?
Answer: 406
Step-by-step explanation:
Answer:
792
Step-by-step explanation:
The answer is 792 because, we know that there is 24 calories in each bar, so, when calculating total amount of, you wan to multiply that amount by however many bars there are. The reason you multiply is because(using this example) when you have a bar with 24 calories and another bar with the same amount, you just add the two calorie amounts together, or 24 + 24. Since you have 33 bars, you would do that 33 times, which is the same as 24 x 33. So if you calculate 24 x 33, you get 792. Another way to solve this is you can use the formula x=cb where x is the total amount of calories, c is the number of calories in one bar, and b is how many bars you have.
help!!!!!!!!!!!!!!!!!!!!
Answer:
The Whole
Step-by-step explanation: it is the whole because it is saying that there were 14 cars sold and that was 56% of whatever the whole is.
help needed!! i’m normally good with fractions but today i just can’t
Answer:
- 40/90 or -4/9
Step-by-step explanation:
the answer will be negitive b/c positive * negitive = negitive
5*8
= 40
that is the numerator
6*15
=90
that is the denominator
then add the - and the answer will be
-40/90
simplify and it is -4/9
ur welcome
HAVING A BAD DAY PLEASE HELP
Find the slope of each line (each block is one unit):
Answer:
1. 7
2. -3
4. -4/6
Step-by-step explanation:
i solved using y2-y1/x2-x1
Answer:
1. slope= 7
2. slope= -3
3. slope= -2/3
Step-by-step explanation
you find slope by doing rise over run (how much you have to go up/down and left/right to get to the next point.
for the first one, to get from the bottom point to the top point, you have to rise 7, and go to the right 1, which makes 7/1, simplified to 1.
for the second one, you go to rise 6, and then go to the left 2, which makes 6/-2, it is negative because when you have to go left, it just means a negative slope. this simplifies to -3
for the third one, you rise 4 and go to the left 6 from the bottom point to the top point. this makes 4/-6, simplifies to -2/3/
hope this help, i'm not the best explainer though, sorry :(
What is the equation of this line?
Answer:
2x - y = 0
Hope this helps
Answer:
y=2x
Step-by-step explanation:
when x =1,2,3 y=2,4,6 respectively so
y is the double of x
y=2x
hope it helps
can you answer this for me? asap
Replace the value of each letter and add:
46 + 19 + 54 = 119
The answer is 119
SOMEONE HELP ME ITS DUE IN 30 MINSS !
mrs Williams is deciding between 23 trips in her class. The science center charges $160+$6 per student. The Dino discovery music simply charges $10 per student. For how many students will the science center charge less than the Dino discovery museum?
Answer:
68
Step-by-step explanation:
Jack traveled 5 miles plus 3 times as many miles as Janice.
He traveled 23 miles in all. How far did Janice travel?
Answer:
Janice travelled 6 miles.
Step-by-step explanation:
23 -5=18
18/3=6
so Janice travelled 6 miles.
could someone explain this
Please help I’ll give brainiest!!
To qualify for a loan from a bank, the total in someone's checking and savings account together must be $500 or more. Which of the inequalities best represents the situation?
1. []x+y less than 500
2.[]x+y less than or equal to 500
3.[]x+y greater than 500
5.[]x+y greater than or equal to 500
Answer:
The answer should be x+y greater than or equal to 500
Step-by-step explanation:
hope this helps. :)
The inequalities best represents the situation for savings account is; option 3: x+y greater than or equal to 500.
What is the meaning of the term inequalities?In mathematics, an inequality is a connection between two representations or values which are not equal to each other.Once inequalities are linked, they can be crossed. As a result, if an is greater than b and b is greater than c, a will be greater than c as well.By multiplying all sides of a inequality by such a negative sign, the sign is reversed.For the given question,
The total in someone's checking and savings account together must be $500 or more.
The inequalities best represents the situation is;
x+y greater than or equal to 500.
To know more about the inequalities, here
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Please help if you can.
Answer:
I would sat b
Step-by-step explanation:
Find two points on the x-axis that are 13 units from (2, 12).
What is −20÷4/5?please help me
−25
−16
−1/16
−1/25
Answer:
-25
Step-by-step explanation:
Between which 2 integers does the square root of 185 lie?
Answer:
13 and 14
Step-by-step explanation:
The square root of 185 is 13.60147.. etc so 13 and 14 at the numbers around that
Answer: 13 and 14
The square root of 185 is approximately 13.60.
13.60 lies between the integers of 13 and 14.
The answer to the question is 13 and 14.
Hope this helps!
Find the difference 3 1/2 - 1 3/4
Answer:
1 3/4
Step-by-step explanation:
Answer:
1 3/4
Step-by-step explanation:
3.5 - 1 .75 = 1.75 = 1 3/4
What is 33/31 in the simplest form
Answer:
1 2/31
Step-by-step explanation:
Helppp !!! Mathematics
1. Find the slope of the line that passes through
the points (8, -7) and (-1, 20).
find the zeros of the equation 4x²-3x+9=2x+1
Answer:
Step-by-step explanation:
PLEASE HELP I DONT UNDERSTAND THIS AT ALL. IM CRYING. HELP ASAP!!!
Find the slope of the line that passes through the pair of points.
A(5, 4), B(8, –8)
a) 1/4
b) 4
c) –4
d) -1/4
Answer:
C. -4
Step-by-step explanation:
The sets of numbers 3, 4, 5, and 8, 15, 17 are Pythagorean triples. Use what you know about the Pythagorean Theorem and explain or show why they are Pythagorean triples. Be sure to show your work for each set of triples!
Answer:
Pythagorean Theorom: a^2+b^2=c^2
Take the largest number of each as C (hypotenuse)
3,4,5
(3)^2+(4)^2= (5)^2
25=25
Therefore it is a Pythagorean Triple.
8,15,17
(8)^2+(15)^2=(17)^2
289=289
Therefore it is a Pythagorean Triple.
1. Write 4 equivalent fractions of each of the following:
(i) ³/₄
(ii) ⁴/₅
(iii) ⁶/₇
(iv) ⁴/₆
Answer:
(i) ³/₄ - 6/8, 9/12, 12/16, 15/20
(ii) ⁴/₅ - 8/10, 12/15, 16/20, 20/25
(iii) ⁶/₇ - 12/14, 18/21, 24/28, 30/35
(iv) ⁴/₆ - 8/12, 12/18, 16/24, 20/30
Step-by-step explanation:
A cheetah runs with an average speed of 32 m/s for 30 seconds. How far did the cheetah run?
Answer:
o.2m.
s=av/t where av= average speed and s= speed and t= time
The cheetah ran 960 meters in 30 seconds with an average speed of
36 m/s.
What is a numerical expression?A numerical expression is a mathematical statement written in the form of numbers and unknown variables. We can form numerical expressions from statements.
We know, distance = speed×time or d = st.
Given, A cheetah runs with an average speed of 32 m/s for 30 seconds.
Here, s = 32 m/s and t = 30 seconds.
Therefore, d = 32×30 meters.
d = 960 meters.
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