Monday
July 25, 2016

Posts by John

Total # Posts: 7,837

chemistry
. In the following reaction: Fe2O3 + 3C → 2Fe + 3CO; how many grams of C are needed to react with 16.5 g Fe2O3?
February 6, 2016

math
Thank you.
February 6, 2016

math
What is -(-(-8)) I believe it's -8 because of the double negative if you work inside the parentheses first?
February 6, 2016

Geometry
Thank you - I have to turn it in online.
February 5, 2016

Geometry
Do you know how I would be able to draw figures on the computer to practice calculating perimeter and area? I want it to look like graph paper (so horizontal and vertical lines) and then make different shapes so I can practice.
February 5, 2016

physics
two equal vectors of magnitude 2A are inclime perpendicular to each other find the resultant and direction of vector.
February 4, 2016

Math
area = 1/2 (b1 + b2)h 24 = 1/2 (12)h Yes 4
February 4, 2016

algebra
This is a parabola. (x+4)(x-3) = 0 x = -4 or x = 3 This is where you would be crossing the x axis. You want the turning point which would be a minimum since this parabola opens upward. I know it opens up because the coeff. of x^2 is positive. -b/2a = x -1/2 = -1/2 then find y...
February 4, 2016

math
You need to change all of them to the same form. Maybe decimals would be the best. .64, .6666, .65, .70 can you order them now?
February 4, 2016

math
Add up all of the votes then divide that number into 855. 855/1500 move the decimal two places to the right and add the % sign.
February 4, 2016

math
35% of the 120 miles = ? .35 times 120 = Just multiply by .35 and you will have the answer.
February 4, 2016

math
P=2l+2w 36= 2(8)+2w 36 = 16 + 2w can you solve from here?
February 4, 2016

chemistry
Give equations showing the commercial methods for preparing of the halogens (F2, Cl2, Br2, and I2).
February 4, 2016

algebra 1
multiply to get 12 then you have to add the one decimal point to get 1.2 Unless you are talking abut 0.4 raised to the 3rd power. If so, you are multiplying .4 times .4 times .4
February 3, 2016

algebra
Take ln of both sides. ln of e^x is x x = ln 20.9 Use a calculator to find x by taking the ln of 20.9
February 3, 2016

English
its C and Mrs.Hayley you could have just gave her the answer
February 2, 2016

PHYSIC
220KG
February 2, 2016

Math
My border is 9 feet long and 1/3 foot wide each tile measures 1/3 foot by 1/3 foot each box of tiles contains 6 tiles how many boxes of tile,do I need show 2 equations to solve the problem
February 1, 2016

perimeter
If the 15 and 20 represent the width and the length then multiply the two numbers to find the area in square meters. Multiply that number by $25 to get the cost.
February 1, 2016

Math
Multiply 12 times 16 to get the area in square meters. then multiply by $15 to get the cost. Does that make sense?
February 1, 2016

algebra
y = a(x-h)^2 +k y = -5(x+2)^2 - 8 Since a is negative, we know that the parabola will face down, so we will have a maximum and not a minimum The vertex is given as (-h,k) You have a -2 because it has to be the opposite of 2 and -8 for k because it is supposed to be the same ...
February 1, 2016

Math
You could subtract 14/K from both sides. (8-14)/k = 3 -6/k = 3 -6 = 3k Divide by 3 to get k = -2 Check in the original equation to be sure it is correct.
February 1, 2016

Grade 5 math
Answered this a couple of minutes ago below.
February 1, 2016

business math
x + .32x = 9,357 1.32 x = 9357 Divide both sides by 1.32 to find the actual cost.
February 1, 2016

math
3 in. / 5 ft = 4 1/8in divide by ?ft 3/5 = 33/8 divided by x multiply both sides by x. 3x/5 =33/8 Multiply both sides by 5/3 x = (33 times 5) divide by (3 times 8).
February 1, 2016

Math
change all times to minute (130 +200 +75 + 160 + x)/5 = 128 Simplify by summing all of the times. Multiply both sides by 5 subtract your sum from that number to find x. Rewrite minutes int hours and minutes.
February 1, 2016

Math
You could double the amounts and it should taste the same 2/3 2/6 2/4 2/4 simplifies to 2/3 1/3 1/2 1/2 You could triple it, etc.
February 1, 2016

math
help @Ms.Sue
February 1, 2016

math
pls help which values will be part of the sequence 3,4,5,6,7,5... 9 11.5 15 19.5 my answers 9 11.5 15
February 1, 2016

math
Find: Two numbers whose sum -10 and whose product is 5. ;;; x+y = -10 x= -10-y xy=5 (-10-y)y=5 -10y-y^2 = 5 -y^2-10y-5=0 y= -9.47213595499958 and y= -0.52786404500042 Two numbers whose sum is 1 and whose product is 1. ;;; y= (-1+ sqrt(-3))/-2 y= (-1 - sqrt(-3))/-2 Find the ...
February 1, 2016

math
Suppose ad-bc=0, c≠0, and d≠0. What can be deduced about a/c and b/d?
February 1, 2016

MATHS
300+50d =1860 -70d 120 d = 1560 day = 13
January 30, 2016

statistics
Find the z-scre 14.98 - 10.43 divided by 5.60 z=.8125 Once the z score is 2 or greater than what happens would be highly unusual. Since the z-score is less than 2, I would say it is possible for the stock to go up.
January 30, 2016

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

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