Thursday
June 30, 2016

Posts by John

Total # Posts: 7,800

math
I agree with A because Box plots do not include means. I agree with your answer. They might want you to look at skewness. If the data is skewed you would use the IQR. Q1 65 95 median difference of 30 95 median Q3 125 difference of 30 not skewed so SD could be used. second one ...
January 30, 2016

statistics
you have to find the mean and the standard deviation of the data. mean = 16.7 sd =26.02 this is if the first number is 95, but I am thinking you meant 9 and 5. mean =8.58 sd = 2.065 To find a z-score subtract the mean from the given value and divide by the sd.
January 30, 2016

Math
A particle is traveling along a straight line. Its position at time t is given by s(t)=7t^(2)+7. Find the velocity at time t=7.
January 28, 2016

math
Solve for X (3x+2)^(1/3)=-2 I multiplied (3x+2)^(1/3) by the power of to cancel the 1/3 I put -2 to the power of 3 as well getting -8 After I subtracted 2, getting me -6 dividing by 3x, I got -2 as my answer. Is this correct?
January 28, 2016

Math
Solve for X (8)^0(8)^x-4=512^X 8^0=1 512=8^64 8^x-4=(8^64)^x x-4=64x -4=63x -(63/4)=x Is this correct
January 28, 2016

Math
Solve for X (1/2)^2-x=(32)^x+1 I'm very confused on how to begin this problem.
January 28, 2016

math
I'm wondering if someone could please help me label this correctly?
January 27, 2016

math
In a freshman class of 3500 students at a particular college, 20000 are taking either a history of English class their first semester. Of these 2000 students, 1300 are taking both a history class and an English class, and 375 are taking only a history class. Draw a Venn ...
January 27, 2016

Math - Percents
Harry and Justin have 180 stickers. If Harry has 25% more stickers than Justin, how many stickers does Justin have?
January 27, 2016

MATH HELP
I need help to find out the area of base, how to find it and how to find the total volume for a cone on a cylinder please help
January 26, 2016

Physical Science
You drop a water balloon off of a tree branch, and you time the drop time at Δt = 1.16 sec, from the instant you drop it to the instant it impacts the sidewalk. What is the height of the tree branch?
January 25, 2016

math
I need help with composite solids involving pythagereom theorem. like how to solve it, what to do first, HOW TO FIND THE AREA OF BASE OF PRISM, etc can you please help me for this, cubes with cylinders in it, and a cone on a cylinder. i need help on those
January 25, 2016

math
I'm not sure, it just didn't seem correct -- but thanks, I guess I will go with it! :)
January 25, 2016

math
10/20 + 11/13 I know I have to first find the LCM which is 260. Then I found the equivalent fractions which were 130/260 and 220/260. When I add those I get 350/260 which is an improper fraction. Then I change that to a mixed number fraction. The answer I got was 1 9/26 but ...
January 25, 2016

physics
An Air plane flys from san fransico to new-york about 4800km at speed of 300m/s how much time does trip take as measured by observer in the plane?
January 24, 2016

math
Thank you, Vin Mwale. Are there any constants or any variables here?
January 24, 2016

math
Identify all components of this statement: 3a + 2b = 7. Is this an equation or an expression and why? o Constant o Variable o Term o Expression o Equation
January 24, 2016

Calculus
Which of the following integrals correctly computes the volume formed when the region bounded by the curves x^2 + y^2 = 100, x = 6, and y = 0 is rotated around the y-axis? I've narrowed it down to either pi∫(sqrt(100-y^2)-6)^2 dy or pi∫(sqrt(100-y^2)^2-6^2) dy ...
January 22, 2016

Calculus
Find the volume of the solid formed by revolving the region bounded by the graphs of y = x^2, x = 4, and y = 1 about the y-axis. I'm supposed to use this equation right? piR^2-x^r^2. and then change y=x^2 to x=sqrty. Thats all I got.
January 22, 2016

Calculus
Find the number a such that the line x = a divides the region bounded by the curves x = y^2 − 1 and the y-axis into 2 regions with equal area. Give your answer correct to 3 decimal places.
January 22, 2016

math
(1)given that -2x^2+6x+7=0, if alfa and B are the roots of the equation, form new equation whose roots are(a)alfa/B and B/alfa (b)alfa/B^2and B/alfa^2(b) if alfa and B are the roots of the equation 4x^+8x-1=0. find the values of alfa^3 B+alfaB^3
January 22, 2016

math HELP
i need help with everything because these make me confused, can you help me on what to do for each solid? if not its fine then but i need help so i can pass this test, i get really confused on what i should do first, then after that so i need the steps please(for all of shapes...
January 21, 2016

math HELP
what is the most easiest way( or can you teach me) for Pythagorean theorem using composite solids for my test tomorrow?
January 21, 2016

math
the Temperatureat night usually decreases at an average of 40 degree per hour. write an integer to represent the temperature change from 10 pm to 5 am?
January 21, 2016

Algebra
A ball was thrown into the air with an initial velocity of 72ft per second. The height of the ball after t seconds is represented by the equation h=72t-16². The graph of the function is shown to the right. It says to describe the dependent variable for this problem and ...
January 21, 2016

physics
In a certain right triangle, the two sides that are perpendicular to each other are 7.00 m and 8.30 m long. What is the tangent of the angle for which 7.00 m is the opposite side?
January 21, 2016

physics
In a certain right triangle, the two sides that are perpendicular to each other have lengths h = 4.40 m and b = 8.70 m. What is the length of the third side of the triangle?
January 21, 2016

physics
A right triangle has a hypotenuse of length 2.00 m, and one of its angles is 24.0°. What are the lengths of the following sides? (a) the side opposite the 24.0° angle (b) the side adjacent to the 24.0° angle
January 21, 2016

Math
Nevermind, I figured it out. I do not know how to delete the question. Thanks
January 21, 2016

Math
Suppose f(x)=x^(2)+6x+1 What is the average rate of change of f(x) with respect to x as x changes from −1 to 1? The AROC is:_____?
January 21, 2016

algebra
the dress store is having a sale where all merchandise is 1/4 off. a woman buys $42 of merchandise at the sales price. what would she have had to pay at the regular price.
January 21, 2016

math
What calculation would I do to figure out how many miles are in a 10k?
January 19, 2016

Math
See where you posted below.
January 19, 2016

math
Think about having a pizza divided in to 4 pieces. Then think about a pizza divided into 8 pieces. We are saying if I have 3/4 of a pizza, someone is going to remove 3/8 of it. It doesn't make sense unless we are talking about the same sizes.. so we would change 3/4 to 6/8...
January 19, 2016

math
Try adding some of these together to look for the pattern: -13 +16 = 3 odd+even = odd -7 + 16 = 9 how about -13 + -7 = -20 -8 + 16 = 8 It looks like even + even = even odd + odd = even even + odd = odd So, we only get an odd result in this case. It seems that it is always true...
January 19, 2016

statistics
If the data is skewed to either the left or the right then you would use the median because the median is not influenced by single large or small inputs. If the data is normal, you will use the mean to find the middle of the data.
January 19, 2016

Math
5 lbs times 16 ounces/lb. 80 ounces of oatmeal. Now how many 8 ounce servings can you get. Divide by 8 to get your answer.
January 19, 2016

Math
p - 2o = sale price
January 19, 2016

Math
there are 12 inches in 1 foot. if you have 60 inches then you have??? feet. Can you finish from here 12 inches/ 1 foot = 60 inches/? foot
January 19, 2016

math
c + t = 70 c = 50 so: 50 + t =70 Can you find the number of trucks? Once you get that number you will subtract it from the number of cars to find out how many more cars you have than trucks.
January 19, 2016

Calculus
Evaluate using substitution ∫(2x^5+6x)^3(5x^4+3)dx where b=0 and a=-1 I got to here and then got stuck u=5x^4+3 du=x^5+3x+C ∫(2x^5+6x)^3 u 1/(x^5+3x+C) ∫(x^5+3x)^3 u
January 19, 2016

math
That is right. Rates have different units like miles/hour or feet/second
January 19, 2016

Algebra
0x^2 +0x +6 That would reduce to 6 This term has degree 0 because the degree refers to the x^0 and x to the zero power is just 1 so if I had 6x^0, then I really have 6(1) = 6 Since all of the terms in the original trinomial cancelled out due to the zero in the coeffient, we ...
January 19, 2016

Calculus
I was mistaken, it is b=x and a=0
January 19, 2016

Calculus
Find the interval on which the curve of ∫ 6/(1+2t+t^2) where b=0 and a=x is concave up. Heres my work but im not sure at all g '(x) = 6/(1+2x+x^2) g ''(x) = -(2+2x)/[(1+2x+x^2)^2] upward when g ''(x) > 0. - (2+2x) > 0 x < -1
January 19, 2016

langauge arts
What is the answer??
January 19, 2016

math
2.08*10^-8=(9*10^9)(1.6*10^-19)^2/d^2 please solve for D
January 18, 2016

Suggestions needed... No specific class
If you could see an everyday object improved by adding something mechanical what would it be? Cause be something that has to do with transportation, help disabled people, etc. For example, creating a wheel chair that is rough terrain and water accessible
January 17, 2016

Math
okay. Did you get 8?
January 17, 2016

Math
40/100 = 2/5 Multiply 2/5 times 20 Can you finish from here?
January 17, 2016

Algebra
Tangent problem of opp/adj tan 67 degrees = x/137 Find tan of 67 and multiply by 137 to find the height of the pole.
January 17, 2016

Math
If it is decreased by 17% then you will have 83% of the 200 which equals 166. This is similar to going into a store where there is a 20% off sale. You pay 80% of the original price.
January 16, 2016

Math
11.52(10) + 8x = 1160x where x is the cost of a pencil. 115.20 =1152x x = .1 or 10 cents. 1160 time .1 is $116 11.52(10) + .1(8) 115.2 = .8 = $116
January 16, 2016

Multiply
There are some short cuts: 1 will always work since the number is even (ends in 8) the number is divisible by 2. If the sum of the digits is divisible by 3 then the number is divisible by 3. If the number is divisible by 2 and 3 then it is divisible by 6.
January 16, 2016

Math
x + y = 12 x-y = 6 add these equations together to get 2x = 18 so x must be 9 Can you find y which represents the other digit?
January 16, 2016

accounting
Do a google search of these two terms and you will find a lot of good information.
January 16, 2016

Mechanics(Ms.Sue)
Yes.. velocity has a direction and speed does not. also, above the right answer is D.
January 15, 2016

Chemistry
I think it is because atoms are so small, you have to measure many of them.. so we are actually taking an average which results in decimals. Does that make sense?
January 14, 2016

Help
As you heat air molecules, they gain more energy and move farther apart which results in less density. control would be the amount of air in the balloon because that doesn't change since air isn't leaving or entering the balloon. Indep. would be the heat dep. would be ...
January 14, 2016

Algebra
There is no GCF here. I assume your -30 is supposed to be -30x. Right? (5x-3)(5x-3) This is a perfect square. You can tell because 5x times 5x equals the first term and -3 times -3 equals the 9. When you have perfect squares in the first and last term of the trinomal try the ...
January 14, 2016

geometry
41 1/3 sq yds divided by 2 1/3 gallons You need to use improper fractions 124/3 divided by 7/3 124/3 times 3/7 124/7 sq yds per gallon which you can change to a mixed number. To find out what Jack is getting you need to multiply the answer above by 9 since 1 sq yard = 9 square...
January 14, 2016

Math
1 dollar / 1.14euros = ?/25 euros cross multiply to get dollars = 1.14(25) Multiply and you will have dollars. 1000 g = 1 kg you have 500 g = 1/2 kg divide your dollars by 1/2 which is the same thing as multiplying by 2 and you will have dollars/kg
January 14, 2016

Math
Are you trying to compare this to feet? So you can see if it makes sense for the shark to be 4.9 meters.
January 14, 2016

Math
Looks right to me because they wanted the ages 10 years ago. Did you use formulas like these? y + m + d = 50 y = d/2 7(y-10) = d -10 You need to work with the last two equations because they have the same variables.
January 14, 2016

Math
r + g =30 That first equation gives you to total number of balls. This next equation is the number of balls times the weight of each ball. Taking into consideration that the green balls are 49 lbs heavier than the total mass of red balls. 9g = 49 + 8r r + g = 30 or g = 30-r ...
January 14, 2016

Algebra
If two lines are parallel, then they have the same slope. 6x-2y =13 -2y = -6x +13 y = 3x -13/2 slope m= 3 y-intercept b=-4 y=mx +b can you finish from here?
January 14, 2016

math
If you are talking about simple interest and not compounding interest then you would just use the formula: A = P+ Prt Where Prt is the interest. 500 x 25 = 12500 A = 12500 + 500(.064)(25) Can you finish from here?
January 14, 2016

Math
I assume that a system means two equations. That means that you graph each equation on the same x-y axis. You can find the points for each graph by using a table of values or you can use the slope intercept method to draw the graphs.
January 14, 2016

Chemistry
C3 H7 because you have to use whole numbers.
January 14, 2016

math
50 boys there would be 30 girls 100 boys there would be 60 150 boys there would 90 girls The above should give you an idea of what the ratio means 125 boys would be 75 girls and a difference of 50 more boys.
January 14, 2016

Math
If our car uses 0.7 gallon of gas in going 10 miles, how much will it use on a 100 mile trip?
January 12, 2016

us history
Pensacola is in Florida and New Orleans is in Lousianna. So..I don't agree with east.
January 11, 2016

Math
Drive is 6 hours 30 min Stop for gas is 10 min Now we have 6 hrs and 40 min. 45 min for lunch so 6 hrs and 85 minutes I hour = 60 minutes so you have 7 hours 20 minutes Can you use this information to figure out when to leave?
January 11, 2016

Physical Education
I agree.
January 11, 2016

math
Are you looking for another solution? if so what do you think/
January 11, 2016

Math
You can tell the lines are parallel if you solve each equation for y. The number in front of the x is the slope as in y =mx+b 6y =3x + 10 divide by 6 to get m=1/2 second equation 6y = 3x -4 m = 1/2 or you could graph both equations and see that they are parallel.
January 11, 2016

2 NDT grade math
green = blue + 2 blue + green = 15 blue + blue + 2 = 15 2b = 13 You can't have a 1/2 of a marble or can you? blue = 13/2
January 11, 2016

Math
I would say elimination since the x has coeffs that are equal and opposite so they will eliminate very easily.
January 11, 2016

us history
I agree again.
January 11, 2016

us history
I agree with you.
January 11, 2016

Math
If you use the elimination method and add the two equations together, if the variables are eliminated and you have a false statement like 0 = 15 then there is no solution. If you have a true statement like 0 =0 then there are many solutions. To check your work, you could also ...
January 11, 2016

math
this is pathegreom theorem 22. Points A, B, and C are corners of a triangular field where mABC is 90°, AB is 40 meters and BC is 45 meters. a) Find the length of AC . A 40 m B 45 m C b) John walks along the edge of the field from point A to point C. If P is the ...
January 11, 2016

math
John walks along the edge of the field from point A to point C. If P is the point on AC when John is nearest to point B, find the length of BP.
January 11, 2016

Algebra 1 Honors
Does your formula work with what was given?
January 9, 2016

Math
(9 + x)/2 = 6 This represents the average of the tests equal to 6. Multiply both sides by 2 9 + x = 12 Find x. Check to me sure the two tests have a mean of 6.
January 9, 2016

Physics- just verfiying an equation
As long as there is no denominator in the formula, each of your variables is directly related to centripetal force. This means if m, r or angular velocity are increased, then Fcent will increase. Due to the squaring on one variable, an increase in that variable will have a ...
January 9, 2016

Algebra
You are correct. If you plot these points you will have a horizontal line crossing the y-axis at 3. If you do the vertical line test, It will only touch one part of the graph; therefore it is a function. It is okay to have different values of x map to the same value of y. ...
January 9, 2016

math
3.60/12 4.96/16 5.20/20 You will get the price per ounce which represents a unit rate. Complete the division in each case and compare them to find the best unit rate.
January 9, 2016

math10
If something cost $100 dollars if you have a 10% discount you would pay $90. Another 10% discount then you would pay $81. The percent Discount would be 100-81/100 or 19%. So.. how dis we do this? Each time we paid 90% of the price. so .9 x .9 =.81 paid.. so our discount is 19%
January 9, 2016

maths
tan 20 = 50/x tan = opp/adj.
January 9, 2016

math10
Any easy way to deal with absolute value inequalities is to treat them like equations to begin with. You have 2 parts: x^2 -x -3 = x^2 -x -3 They are identical, so everything cancels here. Now take the opposite of the second polynomial. x^2 -x -3 = -x^2 +x + 3 2x^2 -2x -6 =0 ...
January 9, 2016

Math
You could graph these points and extend a line through the points to see if the lines cross at one point that would give you one answer. Since the problem states that they are linear, they won't have 2 answers. If the lines are parallel, no solution. If they really are the...
January 9, 2016

Math
If points are all on the same line, then the slope has to be the same no matter what two points we use. Take the first two points and find the slope. change in y/change in x 4 - 3 divided by 8 - 6 1/2 so the slope is 1/2 Now, set 1/2 equal to the slope equation that you create...
January 8, 2016

Biology
B b B BB Bb b Bb bb You see your possibilities. Now, can you get your percents?
January 8, 2016

math
y = 5x + 8 y = 3.5x + 14 You need to graph each equation on the same graph paper and see where the two lines cross. That point is your answer. I will give you a start. The first graph has a point (0,8) and the second graph has a point (0, 14) Find two more points for each ...
January 8, 2016

math
green 1/2 chance of even number white 2,3, 4, 5, 6 = 5/6 AND both happened 1/2 times 5/6 = 5/12
January 8, 2016

Math
Do you really understand how to do these problems? 350 is 70% of what number is = of means multiply. One way to do the problem is to write out the equation based on the sentence 350 = .70 (n) Divide 350 by .70 you will get 500 Another method is called IS over OF 350/n = 70/100...
January 8, 2016

health and pe
No.. not refusal. withdrawal means you are trying to get the drug out of your system.
January 8, 2016

Algebra
x = larger y = smaller x + y = 14 y = 14 - x 5 more than the larger 5 + 14 -x 5 + 14-x - 3x Now, simplify 19 -4x is the variable expression.
January 8, 2016

Calculus
You got it right bro
January 8, 2016

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