Saturday
April 19, 2014

Posts by Bob


Total # Posts: 2,359

math
what is range

math
how many ways are there to chose a three digit lottery number? numbers like 003,014,222,232 or 123 are all allowed.

math
suppose T is a right angle whose sides have a b c. is it possible that each of a b c is an odd integer?

arithmetic
In a certain arithmetic sequence, t6 + t15 = –141 and the common difference is –7. What is the first term of the sequence? explain how to do this please

math
the digits of a two digit number are reversed. when both of these numbers are added the result is 88 and when subtracted the result is 54. the original two digit number contains which of the following digits 2 3 5 or 7

Chemistry
Don't you mean divide? Don't you get L^2mol /mol^2 Lxs The thing is idk if it can be reduced to L/molxs or A) Can it?

Chemistry
What would the units of the rate constant k be in a second order equation if rate was measured in mol/(L x s)and all concentrations in mol/L a)L/(mol x s) b)L2/(mol2 x s) c)L3/(mol3 x s) d)mol2/(L2 x s) I think it's b) but d) is very tempting

Chemistry
When zinc, iron and lead are reacted with hydrochloric acid the variable most easily measured in order to determine the effect of the chemical nature of the reactants on reaction rate is a)temperature b)colour c)surface area d)volume of gas e)concentration Think it's d. Am...

Chemistry
What is the overall order of reaction for the elementary system A+2B=products? a)0 b)1 c)2 d)3 e)5 Can somebody explain this question to me. I don't get it.

Chemistry
So the answer is a?

Chemistry
Consider the following two thermochemical equations N2+2.5O2-> N2O5(s) Delta H=xkJ N2+2.5O2-> N2O5(g) Delta H=ykJ The enthalpy change in kJ for the sublimation of one mole of N205 solid to gas would be represented by the quantity a)x+y b)x-y c)y-x d)-x-y Assuming it'...

Chemistry
Can you explain why you have to subtract the other way?

Chemistry
I thought what your suppose to do is -1275 - ((-875) + (-283))= -117kj/mols Don't u just subtract? To find the difference?

Chemistry
The molar enthalpies of combustion of CH3COCOOH(l)CH3COOH(l) and CO(g) are respectively -1275kJ/mol, -875kJ/mol, and -283kJ/mol. What is the enthalpy change for the reaction below? CH3COCOOH= CH3COOH +CO a)1867kJ b)-1867kJ c)117kJ d)-117kJ e)-2433kJ I think it's d)

Chemistry
The pressure of a gas is 35 atm at a temperature of 48 (degrees) C with constant volume. What will the new pressure be if the temperature is increased to 36 (degrees) C?

Finance
if you bought 12,000 shares of stock at .50 per share and the stock falls to .25 per share how many additional shares would you have to buy to get your bottom line down to .25

algebra
Invest $5,000 in a savings account at 6.6% interest compounded monthly

math
weighted coin has property that heads comes up 60 percent of time. two flips of coin is it more likely that outcome from two flips are the same or outcome from two flips are different?

geometry
How many hours will it take a bicyclist traveling 17.6 feet per second to finish a 90-mile race? Round your answer, if necessary, to the nearest tenth.

geometry
Why don't parallel lines exist in elliptical geometry?

GEOMETRY
A __________ __________ touches every vertex exactly once, but does not return to its origin. ________________________________________ A. Hamiltonian circuit B. Hamiltonian path C. Euler circuit D. Euler path

GEOMETRY
Which of the following are measurements of the sides of a right triangle? ________________________________________ A. 3, 4, 5 B. 28, 26, 12 C. 17, 14, 6 D. all of the above

geometry
Which of the following are measurements of the sides of a right triangle? ________________________________________ A. 3, 4, 5 B. 28, 26, 12 C. 17, 14, 6 D. all of the above

geometry
The width of a rectangle is 6 feet, and the diagonal is 10 feet. What is the area of the rectangle?

chem 121
^good hints

Geometry
Which of the following is NOT a way you can show that triangles are similar? ________________________________________ A. AAA similarity B. SAS similarity C. SSA similarity D. SSS similarity

Geometry
If an object is reflected twice over parallel lines, and corresponding points of the original and final translation image are 30 centimeters apart, how far apart are the parallel lines?

science
Ear defenderes reduce the amount of noise (sound power) that gets to your ears by producing a physical barrier that absorbs the noise and muffles it.

Geometry
nvr mind i found it its c

Geometry
Congruent triangles have a relation. Which is not an equivalence relation? ________________________________________ A reflexive B symmetric C distributive D transitive

algebra
solve by subsitution 6x + 5y = 27 x = 17 -8y my answer was (3,-7)

Geometry
Points (5, 3) and (6, 2) lie on line k. Which is the slope of the line that is parallel to k?

algebra
find the slope (4,-4)

Geometry
The side of a square measures 3 cm. What is its area?

Physics
I have a formula for inertia torque T(inertia) = .09 x Wk^2(inertia)/S(stops) x t(move)^2 This is a shaft that indexes 36 degrees at a time so that how we determine 10 stops for S. I do not know where the factor .09 comes from. Can you explain

Physics
I have a formula for inertia torque T(inertia) = .09 x Wk^2(inertia)/S(stops) x t(move)^2 This is a shaft that indexes 36 degrees at a time so that how we determine 10 stops for S. I do not know where the factor .09 comes from. Can you explain

Statistics
there are 120 possible sample of size n=3 which can be drawn from this population of 10 score: 3,4,5,6,7,8,9,10,11,12

TI-83 CALC PROGRAM
F you

geometry
a bug lives on a corner of a cube and is allowed to travel only on the edge of the cube. in how many ways can bug visit each other of the other seven corners once and only once, returning to its home corner only at the end of the trips?

geometry
a bug lives on a corner of a cube and is allowed to travel only on the edge of the cube. in how many ways can bug visit each other of the other seven corners once and only once, returning to its home corner only at the end of the trips?

Math
A television manufacturer makes console and wide-screen televisions. The profit per unit is $125 for the console televisions and $200 for the wide-screen televisions. Write the objective function that describes the total monthly profit. Write a system of three inequalities tha...

Math
Objective Function z = 3x - 2y Constraints x > or equal to 1 x < or equal to 5 y > or equal to 2 x - y > or equal to -2

Math
Using 3.14 for pi, rounding to the nearest tenth, if necessary. A spherical storage tank has a diameter of 48 ft and is full of water. How many delivery trucks with cylindrical tanks measuring 8 ft in diameter and 10 ft long can be completly filled from the storage tank?

chemistry
Calculate the hydroxide ion conc. and the % ionization @20oC in a 1.25 M NH3 solution. The Kb for NH3 = 1.70x10-5 @20oC.

Trigonometry
Okay that makes sense. I knew i was overlooking something. Thanks for the help Reiny! it really helped me out

Trigonometry
sin (4x) = .5 what are the 4 solutions? How did you get them?

Geometry
perimeter=8+5+8+5=26m area=8*5=40m

algebra
a (-1/6, 1) it goes 1 to the left and 10 up. the midpoint of 1 is 1/2 and of 10 is 5. it goes 1/2 to the left of the x value in the first point and 5 up from the y value. (1/3-1/2, -4+5)=(-1/6, 1)

Trigonometry
for the example you gave i can get 37.5 deg and 7.5deg. what are the other solutions?

Trigonometry
Thanks Reiny. If a question similar to this one had 4 solutions, how would you know that it had 4 answers?

Trigonometry
3csc(2X)-5=0 What are the solutions for X and how did you find them out?

Macroeconomic
1. An example of an automatic stabilizer is A. a temporary tax rebate. B. the progressive income tax.Student Response C. cost of living adjustments to social security payments. 2. Which of the following represent expansionary fiscal policy? A. an increase in average individual...

Macroeconomic
The idea that creating incentives for individuals and firms to increase productivity leading to an increase in the long-run aggregate supply curve is a. the Ricardian equivalence theorem. b. demand-side economics. c. consistent with crowding out. d. supply-side economics.

physics
A 5 m long see saw has a child whose mass is 25 kg sitting on one end. How far in meters from the center should a 70 kg adult sit on the opposite side for the see saw to balance?

Math
Graph linear inequality y<-2x + 4 y<x-4

Economic
1) GDP does not include intermediate goods because a. that would understate the true size of GDP. b. intermediate goods are not useful to consumers. c. that would count the value of intermediate goods twice. d. intermediate goods are not valuable. 2) The dollar value of an ind...

electric fields *easy
mecotes

Science-8th
how would i do C5H12 + O2 CO + H2O

Math
3x + 4y less than or equal to -12 Graph linear inequality

algebra
Find the x-intercept: f(x)=3x^2-5x-11

math
What si the volume and surface area of a triangular prism with the dimensions of a 2.5 base, 2.5 height, and 7 length

physics
A constant net force of 1500 N gives a toy rocket an acceleration of 2.5 m/s2. what is the mass in kg?

physical science
A constant net force of 1500 N gives a toy rocket an acceleration of 2.5 m/s2

chemistry
Why is it important for a company manufacturing vinegar to regularly check the molarity of its product?

college statistics
Three members of a club will be selected to serve as officers. The first person selected will be president, the second person will be vice-president and the third will be secretary/treasurer. How many ways can these officers be selected if there are 30 club members?

6th grade writting
how many paragraphs is an essay?

chem
1 molar solution of Pb(NO3)2 you want 3mL of 0.5 Molar Pb(NO3)2 how much of the one molar solution do you mix with H2O to reach your goal

Statistics - Urgent
If there were two groups: One group who saw a yardstick before estimating its length Another group who did not see a yardstick before estimating its length Would this be a matched pairs design (a person from both groups estimates at the same time, then the next pair, etc.)? Or...

Statistics - Data Collection
Specifically for a two sample t test on difference in means with a matched-pairs design. What would the step-by-step process be for a simple random sample from the cafeteria population?

Statistics - Data Collection
If you were in a cafeteria full of students and you wanted to randomly divide 10 students into group A and 10 students into group B, what would be the least biased way to do it?

science
How can an animals structure help survive in different environments? give three examples

statistics
To reduce theft, the Meredeth Company screens all its employees with a lie detector test that is known to be correct 90 percent of the time (for both guilty and innocent subjects). George Meredeth decides to fire all employees who fail the test. Suppose 5 percent of the employ...

math
No One was Not taking any of these,Because 33+13=46

posting box
That might be from loading and You may just not have the settings it needs

social studies
Republicans

all subjects
Yes I love it!!It gives me a bunch of help and it is VERY fun I spend HOURS o this.And Ms.Sue Is ALOT of help,She has Complete Answers And Gives you Websites if she has a good 1!Thanks A BUNCH Jiskha I LOVE this!

True False
False It should be "Many students anticipate spring break,But Luise looks forward to Winter vacation more."

QUICK! BE THE FOURTH PERSON TO CLICK TO WIN BIG $!
This was a HUGE waste of time

Africa
Gorillas are from there!!!! :)

english
OF COURSE!!!!!!

math
how many ways can 9 cars be parked in a row of 9 parking spaces?

chemistry
thank you very much DrBob!!I really appreciate this

chemistry
how many grams of oxygen is required to produce 2.0 kg of water??

science /chem
yup that's right

algebra
What should you say if you see a tall wrought-iron tower in paris, france?

5th grade
I am A 5th grader To.Blameless,Exculpated,and Simply Not Guilty.

calc Urgent please
idk

calc Urgent please
idk

Data Management
Oh also n is the total number of tickets which in this case is 1000000

Data Management
P(x) of 1000000 is 1/1000000 P(x) of 50000 prize is 2/1000000 P(x) of 1000 prize ia 10/1000000 P(x) of 50 prize is 200/1000000 P(x)=p Find E(x) for each one E(x)= n.p Then add all E(x) values to find the expected value of all prizes for one ticket Finally, that that total and ...

english
true but dount

Social Studies
What large city is northeast of New York City?

math
12

chemistry
A solution is prepared by mixing 0.0433 mol CH2Cl2 and 0.0623 mol CH2Br2 at 25°C. Assuming the solution is ideal, calculate the composition of the vapor (in terms of mole fractions) at 25°C. At 25°C, the vapor pressures of pure CH2Cl2 and pure CH2Br2 are 133 and 11...

chemistry
Glycerin (C3H8O3) is a nonvolatile liquid. What is the vapor pressure of a solution made by adding 180. g of glycerin to 321 mL of H2O at 39.8°C? The vapor pressure of pure water at 39.8°C is 54.74 torr and its density is 0.992 g/cm3.

chemistry
Calculate the molarity and mole fraction of a 2.35 m solution of acetone (CH3COCH3) dissolved in ethanol (C2H5OH). (Density of acetone = 0.788 g/cm3; density of ethanol = 0.789 g/cm3.) Assume that the final volume equals the sum of the volumes of acetone and ethanol.

chemistry
Calculate the sodium ion concentration when 55.0 mL of 4.5 M sodium carbonate is added to 15.0 mL of 3.0 M sodium bicarbonate.

chemistry
What must be the pH of a solution that is 0.067 M Fe3+ to just cause Fe(OH)3(s) to precipitate?

math
prove the following: given: ABCD is a trapezoid with bases BC and AD to prove: BX • AX = DX • CX X is the intersection of the segment going from BD and AC i need the answer in a two column proof statements Reasons 1. ABCD is a trapezoid with 1. given bases BC and AD ...

physics
In the figure below, a box of Cheerios (mass mC = 0.8 kg) and a box of Wheaties (mass mW = 2.5 kg) are accelerated across a horizontal surface by a horizontal force applied to the Cheerios box. The magnitude of the frictional force on the Cheerios box is 2.0 N, and the magnitu...

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