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September 30, 2014

Posts by josh


Total # Posts: 1,491

statistics
What probability value should be used for determining whether the modified process results in a defect rate that is less than 6%. I got part a and b of the question but I am completely lost on what this is asking me. Can anyone help?!?
February 10, 2012

chemistry
When do you put the suffix (g) after a compound?
February 2, 2012

statistics
the answer is the standard deviation is 6 but i dont know how to get that
January 31, 2012

statistics
the distribution of scores on a test is mound shaped and dsymmetric with a mean score of 78. if 68 percent of the scores fall between 72 and 84, what is the stand deviaition
January 31, 2012

trigmsu
csc(θ) / cot(θ)
January 30, 2012

trig
Use a ratio identity to find tan(θ) if given the following. sin=6/sq rt 37 and cos 1/sq rt 37
January 26, 2012

trig
Find the remaining trigonometric ratios of θ if sin(θ) = -1/6 and θ is not in QIII cos tan cot csc sec
January 26, 2012

trig
Give the reciprocal of the following. 7/15
January 26, 2012

trig
If sin(θ) = 8/17 and θ terminates in QI, find cos(θ)
January 26, 2012

trig
Find y if the point (7, y) is on the terminal side of θ and cos(θ) = 7/25
January 25, 2012

Chemistry
A certain substance has a heat of vaporization of 34.65 kj/mol. At what kelvin temperature will the vapor pressure be 3.50 times higher than it was at 331 k?
January 25, 2012

5th grade math
A pair of shorts would cost 12 dollars. I solved it by setting the two equations equal to one another. 2T+2S+42=T+3S+45 Minus 42, minus t, minus 2S gives: T=S+3 So you know S is 3 more than T. Then just trial and error solve to get shorts are 12 dollars and tshirts are 9.
January 24, 2012

geometry
In parallelogram ABCD, BC = 8, DC = 12, and measure of angle D is 50 degrees. Find the area of the parallelogram to the nearest tenth.
January 23, 2012

physics
A piece of metal with a mass of 1.9 kg, specific heat of 200 J/kg ◦ C, and initial temperature of 100 ◦ C is dropped into an insulated jar that contains liquid with a mass of 3.9 kg, specific heat of 1000 J/kg ◦ C, and initial temperature of 0 &#...
January 17, 2012

Algebra II-Please check
I'm sorry the computer jammed on an earlier post and I couldn't do anything-so here is the problem I need asistance with Please check and offer advice-I'm NOT SURE IF I USED CORRECT FORMULAS-thank you the problem is List the center, vertices, and foci of hyberbola ...
January 13, 2012

algebra-Please recheck this
I think I did the vertices and foci incorrect This is a verticl hyperbola, correct? So formula for vertices would be (h, k+-a)=(8,2+-6)=(8,8) (8,-4) Foci should be c^2 = a^2 + b^2 8^2 + 2^2 = 64+36 c=10 foci=(8,2+-10) (8,-8) (8,12)
January 13, 2012

AlgebraIIPlease check-sorry my computer jammed
I'm sorry the computer jammed and I couldn't do anything- the problem is List the center, vertices, and foci of hyberbola for following equation: (y-2)^2/36 - (x-8)^2/64 = 1 b=6 a=8 Center(8,2) Vertices=(h,k+b) (h,k-b)=(8,8) (8,-4) Foci =(h +-c,k) c^2 = a^2 + b^2 c^2...
January 13, 2012

algebra
¯3 x 5 + ¯36 ÷ ¯3 -- ¯7 — 10 + 6 x ¯8 ÷ ¯24 —1 =
January 13, 2012

algebra 1
formula A=P(1+r)^t An account earning interest at a rate of 4% has a principal of $500,000. If no more deposits or withdrawals are made, about how much money will be in the account after five years?
January 5, 2012

penn foster Main ideas
Both Greta and Fred were on the bus that arrived in Pittsburgh. Fred was glad to be home. He looked forward to visiting with old friends. Greta, on the other hand, dreaded seeing her old boyfriend. She already missed her days in New York City. 16. What can you most safely ...
January 5, 2012

algebra 1
The midpoint of XY is point M(-12,5). If the coordinates of X are (3,-3), what are the coordinates of Y?
January 4, 2012

math
Frances sells greeting cards. The materials for a card cost $2.40, and she will include an 80% markup. What is the selling price of each card?
January 3, 2012

Physics
6meter west
December 18, 2011

algebra
-10-3/7x=5
December 18, 2011

Algebra
10A^8/7V^3 TIMES 49R^7/100A MULTIPLY AND SIMPLIFY
December 17, 2011

Algebra
THANK YOU!!!
December 17, 2011

Electric Power Tools
just checked you answers, 100% correct
December 15, 2011

Statistics
9. Assume the weight, W, of a randomly selected adult has a normal distribution with a mean of 175 pounds and a standard deviation of 10 pounds.. Find the probability, P(W < 190), that a randomly selected adult weighs less than 190 pounds.
December 13, 2011

Pre Calculus
Newton's law of cooling T(t)= Tm + (To-Tm)e^-kt, k >0\ Evaluate T(0). Simplify and explain the result I'm very confused on how to do this, i think i will be able to explain the result but if you could help me simplify this that would be great, Thank you very much.
December 12, 2011

trig
I get the second one, but the first I don't. What identity are you using for the first to get from line one to two?
December 11, 2011

trig
Getting ready for trig semester finals. Can't figure out how they are simplifying these equations. (these are the review not actual test) tanx-sqr3=2tanx and 2sin^2+sinx=0
December 11, 2011

Physics
C. A small force over a long time period. With the small force being divided by a larger number (time), it will have the least momentum.
December 9, 2011

science
Cool it
December 8, 2011

math
What is the scale on a map that shows two cities that are 400 mi apart as 2.5 in apart?
December 8, 2011

physics
what is your final velocity after 680 meters if you start out at 90km/hr and acceleration is 9 m/s
December 7, 2011

geometry
The scale drawing for a business office is drawn so that 1 cm = 2 ft. If the length of the model is 4 cm and the width is 9 cm, what is the actual area of the business office?
December 6, 2011

Physics
What is the acceleration of a proton in an electric field of 10^6 N/C?
December 6, 2011

Physics
What is the acceleration of a proton in an electric field of 10^6 N/C?
December 6, 2011

phi 103
Which of the following may not qualify as a falsifiable claim?
December 4, 2011

spanish
OHHHH I got it! Where does one go when one wants to shop at many different types of stores? Sometimes I'm such a simpleton.
December 2, 2011

spanish
I'm having problem here with number 5. Vamos al ______ could be any number of things... I would assume it's 'shopping' but that isn't accepted...
December 2, 2011

physics
A convex mirror has a focal length of 15 cm. A 3.0 cm high object is located 10 cm in front of this mirror. Where is the image located?
December 2, 2011

physics
A 5 meter diameter telescope is used to observe binary star systems. What is the minimum separation distance (perpendicular to the line of sight) for which the two stars can be resolved if they are at a distance of 1,000 light years = 10 m and they are observed in visible ...
December 2, 2011

physics
Light shines through a single slit whose width is 1.12 mm. A diffraction pattern is formed on a screen located 4.0 m away. The distance between the middle central bright fringe and the second dark fringe is 4.0 mm. What is the wavelength of the light?
December 2, 2011

physics
A light ray travels from water to air. If the ray strikes the water/air boundary at an angle of incidence of 46 degrees, what is the angle of refractiob in air? (n water = 1.33)
December 2, 2011

Physics
a 59kg student jumped off the back of a 42kg sailboat, the boat was already travelling at 3.1m/s before she jumped. if she jumpped off with a speed of 2 m/s, how fast was the boat moving? thanks for any help
December 1, 2011

Science
Are sunspots cooler or hotter spots in our sun? I think it's cooler
December 1, 2011

Science
What causes day and night? What's the difference between a solar eclipse and a lunar eclipse?
December 1, 2011

Science
How does Earth have seasons?
December 1, 2011

Government
blah
November 29, 2011

calculus
A growing boy who is 4 feet tall stands 8 feet from a 12 foot lamp post. The boy is growing at the rate of 3/4 inches per year. How fast is his shadow growing (in inches per year)?
November 25, 2011

physics
You need to move a 135-kg sofa to a different location in the room. It takes a force of 92 N to start it moving. What is the coefficient of static friction between the sofa and the carpet?
November 23, 2011

MATH
So none of these are correct? 2/3 divided 3/5 = 1 1/9 or 2/5?
November 22, 2011

Math
can you please let me know if these are correct: 1. 5 5/6 x 2 4/5 = 16 2. 2/3 divided 3/5 = 1 1/9 or 2/5? 3. 7/12 divided 2/3 = 7/8 4. 3 1/2 divided 3/4 = 4 2/3 or 2 5/7 5. 4 2/3 divided 7 = 2/3 6. 4 1/5 divided 1 2/5 = 3 7. 2/5 x 5/14 = 1//7 8. 2/3 + 1/7 = 17/21 OR 12/21
November 22, 2011

Pre Calculus
find all solutions of the equation 1. x^3+27=0 2. x^3-8=0
November 21, 2011

Pre Calculus
1. Find all rational zeros of the polynomial. Then determine any irrational zeros, and factor the polynomial completely. 3x^4-11x^3+5x^2+3x 2. Find the polynomial with leading coefficient 1 that has a degree of 4, a zero of multiplicity 2 at x=1 and a zero at x=2+i
November 21, 2011

Biology 11
the genotype of the hybrids of two pure-breeding pea plants that each have white flowers and round seeds (both traits dominant) would be?
November 20, 2011

Pre Calculus
Find a third degree polynomial P(x) that has zeros at x=-1, x=1, x=2 and whose x-term has coefficient 3?
November 20, 2011

Chemistry
A typical buffer used by biochemists is called Tris, which can be depicted as R3N. A buffer that is prepared by mixing 500ml of .05M R3N with 500ml of .05MR3NHCl at 25 C has a pH of 8.40. If this same buffer is placed in a cold room at 4 C the pH increases to 9.2. From this ...
November 17, 2011

social studies
What did the people of ancient Ghana have that the proto-Bantu-speaking people did not? What effects do you think this had on their descendants?
November 16, 2011

Physics
a) Find the acceleration of the block if the incline is frictionless. b)Find the acceleration of the block if the coefficient of kinetic friction between the block and incline is 0.12.
November 16, 2011

Physics
A block of mass m = 5.2 kg is pulled up a è = 24° incline as in the figure with a force of magnitude F = 34 N.
November 16, 2011

MATH
Please help me with these: 1. 5/8 + 5/6 = 2. 2 3/5 + 4 4/5 = 3. 13 1/2 + 7 2/3 = 4. 3/8 - 3/8 = Thanks!
November 15, 2011

MATH
Please help me with these: 1. 5/8 + 5/6 = 2. 2 3/5 + 4 4/5 = 3. 13 1/2 + 7 2/3 = 4. 3/8 - 3/8 = Thanks!
November 15, 2011

English
Are there any tutors on here that are familiar with The Canterbury Tales?
November 13, 2011

spanish
is this past or present tense Mi Papa escribio un cheque
November 10, 2011

Math - Calculus III
Find the double integral of f (x, y) = (x^7)y over the region between the curves y = x^2 and y = x(3 - x).
November 8, 2011

Math
Find the double integral of f (x, y) = (x^7)y over the region between the curves y = x^2 and y = x(3 - x).
November 8, 2011

political science
In need of help on my political science homework please help with these questions Only these questions left! One reason why the US has only 2 major parties is that it has: A. insufficient opportunities to bribe candidates B. too much involvement by religious groups C.single-...
November 6, 2011

Chemistry! HELP;
An atom of potassium (K) has 19 protons: 18 electrons in its inner electron energy levels and 1 electron in its outer energy level. What is the easiest way for this atom to get a filled outer energy level? What is formed?
November 6, 2011

algebra
can you please help me with these 1. -5/c = 1/3 2. k/8 = -2/5 3. 6/z = -3/5
November 1, 2011

math
Please help me with these 1. -5/c = 1/3 2. k/8 = -2/5 3. 6/z = -3/5 Thank you
November 1, 2011

Botany
During the last part of cellular respiration in the mitochondrion, electron flow is tapped and used to make ATP. Where do the electrons end up when they are finished flowing?
October 31, 2011

Math
Find the general solution of the equations csc^2 θ =4/3.
October 30, 2011

Pre Calculus
using the factor theorem to show that x-c is a factor of P(X) for the given values of c, and factor 1. P(x)=x3-5x^2+8x-4; c=1
October 29, 2011

Pre Calculus
Exponential growth and decay find the half life of a radioactive substance if 220 grams of the substance decays to 200 grams in 4 years?
October 25, 2011

CHEMISTRY PLEASE HELP
a) How will the concentration of NaOH be affected if during the titration some of the solid potassium hydrogen phthalate was spilled during the transfer? Will the concentration of the standardized NaOH increase, decrease, or have no effect? b) How will the molar mass of an ...
October 24, 2011

CHEMISTRY PLEASE HELP
Using the data collected for part b on your data sheet, calculate the molar mass of the unknown acid. Include the calculation for each trial and the average. Trial One Results: Mass unknown acid: 0.500g Final buret reading: 18.01mL Initial buret reading: 0.11mL Volume NaOh ...
October 24, 2011

CHEMISTRY PLEASE HELP
Using the data collected for part c on your data sheet and assuming the density of the vinegar is 1.00g/mL, 1) calculate the molar concentration of acetic acid (CH3COOH) in the vinegar sample using the average volume of NaOH. 2) calculate the mass percent of acetic acid in the...
October 24, 2011

Chemistry
Using the data collected for part c on your data sheet and assuming the density of the vinegar is 1.00g/mL, 1) calculate the molar concentration of acetic acid (CH3COOH) in the vinegar sample using the average volume of NaOH. 2) calculate the mass percent of acetic acid in the...
October 24, 2011

Chemistry
Using the data collected for part b on your data sheet, calculate the molar mass of the unknown acid. Include the calculation for each trial and the average. Trial One Results: Mass unknown acid: 0.500g Final buret reading: 18.01mL Initial buret reading: 0.11mL Volume NaOh ...
October 24, 2011

Chemistry
a) How will the concentration of NaOH be affected if during the titration some of the solid potassium hydrogen phthalate was spilled during the transfer? Will the concentration of the standardized NaOH increase, decrease, or have no effect? b) How will the molar mass of an ...
October 24, 2011

statistics
government data assign a single case or each death that occurs in the u.s. the data show that the probability is 0.45 that a randomly chosen death was due to cardiovascular disease, and 0.22 that i was due to cancer. Suppose a docote checked the cause of death of 2 randomly ...
October 24, 2011

Pre Calculus
Inverse functions what is the inverse function of f(x)=1/square root of x +1? and f(x)=1-x^2, x<0?
October 23, 2011

Pre Calculus
Exponential and log functions What initial investment at 8.5% compounded continuously for 7 years will accumulate to 50,000?
October 23, 2011

Pre Calculus
Inverse functions find the value If f(x)=1/x, find f^-1 (2)
October 22, 2011

Pre Calculus
Exponential Growth and Decay Find the half-life of a radioactive substance that decays by 5% in 9 years.
October 22, 2011

Pre Calculus
Logarithms Solve the equation for x 1-ln(3x+2)=0
October 21, 2011

Pre Calculus
Applications of trigonometric functions Solve the missing parts of the triangle satisfying a=125 b=150 alpha=55 degrees There are two solutions
October 14, 2011

Math
I have input x (20,1,40,4,8,10) and output y (2,40,1,10,5,4). What is the function?
October 13, 2011

Calculus
Using Law of Sines: Need Help 1. alpha=70 Degrees Beta=38 Degrees a=35
October 13, 2011

math
58 cm times 55.6. try to find the area for this problem
October 11, 2011

Physics
Two blocks are at rest on a frictionless, 20 degree incline. What are the tensions in the two strings if block 1= 5.3kg and block 2= 2.4kg?
October 10, 2011

Physics
Each of 108 identical blocks sitting on a frictionless surface is connected to the next block by a massless string. The first block is pulled with a force of 108N. What is the tension in the string connecting block 108 to block 107?
October 10, 2011

Physics
Each of 108 identical blocks sitting on a frictionless surface is connected to the next block by a massless string. The first block is pulled with a force of 108N. What is the tension in the string connecting block 108 to block 107?
October 10, 2011

algebra
I NEED HELP SOLVING THIS PROBLEM WX/P + P/X = PLEASE EXPLAIN AND SHOW HOW TO SOLVE W = 3.5, X = .4, P = 2.6
October 10, 2011

Calculus
solve this equation on the given interval expressing the solution for x in terms of inverse trigonometric functions. 6(cosx)^2-cosx-5=0 on (pie/2, pie)
October 10, 2011

physics
Each of 108 identical blocks sitting on a frictionless surface is connected to the next block by a massless string. The first block is pulled with a force of 108N. Part A. What is the tension in the string connecting block 108 to block 107? Part B. What is the tension in the ...
October 9, 2011

Chem
A lake may be polluted with Pb2+ ions. what precipitation reaction might you use to test for the presense of Pb2+?
October 9, 2011

Physics
An ice sled powered by a rocket engine starts from rest on a large frozen lake and accelerates at 15.0 m/s 2 . At t1 the rocket engine is shut down and the sled moves with constant velocity v for another t2 s. The total distance traveled by the sled is 5.60 × 10 3 m and ...
October 6, 2011

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