Friday
April 29, 2016

# Posts by Brian

Total # Posts: 697

Calculus
Evaluate as limit approaches 0. (Without using l'hopital's rule. ( Sqrt(4+sin(x))-2 ) / (3x)
April 28, 2016

Chemistry
Calculate the total amount of heat that must be added to convert 15.7g of ice at its melting point to steam at 100.0°C
April 20, 2016

Science
A transformer with 1890 turns in its primary coil has to decrease the voltage from 4620 V to 220 V for home use. How many turns should there be on the secondary coil?
April 1, 2016

Physical Science
A 20.0-Ù resistor and a 45.0-Ù resistor in parallel are connected to a 120-V dc source. (a) What is (are) the current(s) through the resistors? current through the 20.0-Ù resistor: Incorrect: Your answer is incorrect. . A current through the 45.0-Ù ...
March 30, 2016

English
Ms. Sue, it was A, you were wrong. I should have put what i thought.
February 18, 2016

English
Thanks, and is the second one A
February 18, 2016

English
Nine Haikus During a Drought In the dusty lane A frog waits for a puddle To fall from the sky Which form best describes this poem? A. limerick B. Haiku C. Concrete D. Narrative My choice is B. Haiku What about the poem best supports the answer to the previous question? A. It ...
February 18, 2016

science
A bullet of 29g is shot from a gun of mass 20kg with a muzzle velocity of 200ms if the bullet is 30cm long.determine. a)acceleration of the bullet b)the recoil velocity of the gun
February 15, 2016

phisics
4. A gun’s bullet was launched horizontally with a speed 600m/s. It fell to the ground 300m away from the gun. a. How long was the bullets flight? b. At what height was the gun’s barrel at the moment of the shot? 5.
February 9, 2016

physical science
A golfer on a level fairway hits a ball at an angle of 38° to the horizontal that travels 85 yd before striking the ground. He then hits another ball from the same spot with the same speed, but at a different angle. This ball also travels 85 yd. At what angle was the ...
February 1, 2016

Chemistry
Given that ΔH (fusion) of water is 6025 J/mol, Cp,m(ice) = 37.7 J K–1 mol–1, and Cp,m(water,liquid) = 75.3 J K–1 mol–1, calculate ΔG (in J) for the freezing of 89 moles of water at 1 atm pressure and the constant temperature T = 14.4 °C. I got...
January 28, 2016

engineering science
calculate the work done required to push a car for 420 meters up an melon the force required to push the car is equal to 615n
January 22, 2016

chemistry
A sample of nitrogen has a volume of 50.0L at a pressure of 760mmHg. What is the volume of the gas at each of the following pressures if there is no change in temperature? A. 1500mmHg B. 4.00 atm C. 0.500atm
January 14, 2016

Math
Not sure how to solve 0.3x??
January 13, 2016

Math
How is that the ansswer. The discount was \$18 it ask the original price of the coat with a 30% discount?
January 13, 2016

Math
Jane buys a coat that is \$18 off the orinigal price. This is a 30% discount. What is the original price of the coat? Please explain how to get answer? Thanks
January 13, 2016

math
Don't get it I'm in 4th grade
January 10, 2016

math
Don't get it
January 10, 2016

math
January 10, 2016

math
Taylor's home street address number has five digits. Two digits have values of 60,000 and 300.the last digit is 9.the value of each of the other digits is ten times the value of the digit on it's right. What's Taylor's home street address number.
January 10, 2016

math
Susie loves Starbucks coffe today,while waiting to place her order for her salted caramel macchiato , she noticed the prices for the three sizes that were available 12oz for \$3.60 16oz for \$4.96 20oz for \$5.20 which size is the better unit rate
January 9, 2016

Math
Missing base 1/9= [. ] with exponent 2 please explain how I can get the answer thanks
December 15, 2015

Math
Missing exponent of 1/169=(1/13) please explain how I can find the missing exponent
December 15, 2015

English
Background Your favorite cousin has moved to your town and is looking for a job. Her previous experiences are working as a cashier and sales clerk at two department stores. You know she plans to apply at similar stores in your town. But you also know she is a perfect match for...
December 5, 2015

math
if i ran 1&5/8 mile and than later ran 9/10 of a mile what is the amount
November 17, 2015

Chemistry
Apologies, the numbers corrected are: 40.0 ml of 2.50 M KOH to prep a solution that is 0.212 M
October 23, 2015

Chemistry
How many ml of water must be added to 40.0 ml of 2.50 m koh to prepare a solution that is 0.212 m?
October 23, 2015

Math
otto spent 3/4 of the money he had saved on a new video game. if the game cost \$48, how much money did he have before he bought the game?
October 22, 2015

Southridge
What's the process if the input numbers are 1,2,3,4,5 and the output numbers are 2,5,10,17,26
September 29, 2015

Math
On a ruler that measures both metric and English units, we see that 1m=39.37 in. This implies that 2m = 78.74 in. Use this information to write an equation to convert x in. to y meters.
September 28, 2015

math
simplify: 5-(-3)^2 -6
August 25, 2015

nyonithwele
math: 38 learners at a high school,24play hockey,30play netball and 4play neither hockey nor netball.use venn diagram
August 23, 2015

Physics
Two charged particles have equal mass and carry charges of 2 nC and 3 nC respectively. They enter a magnetic field of strength 2 mT at the same velocity. Assuming that both particles exit the field parallel to each other and perpendicular to the field, determine the separation...
August 14, 2015

physics
the Apollo 10 spacecraft traveled at 11 km/s just prior o its re-entry, setting a speed record for humans. Suppose advanced technology raises the speed record by a factor of 100, to 1100 km/s. if a time travel of 1 hour elapsed on a ground-based clock, by how many seconds ...
August 13, 2015

Math
there are 600 fruits in a supermarket. If .64 are oranges and the rest are apples how many more oranges than apples are there
July 8, 2015

calc
I am having problem with the 1oo n. I know by taking the limit to the 1/n power gives me e in the denominator. How and what does (100n)^1/2n become?
June 27, 2015

calc
use the root test to to determine the convergence or divergence of the series 100n/e^n
June 27, 2015

math
1000ml x 15 gtt x 1 hr = 31 gtt 8hr ml 60 min How do you do this???
June 15, 2015

English
Dragonwings by Laurence yep What conflict is left unresolved at the end?
June 7, 2015

Both the authors of Zoos: Joys or Jails and the author of Why do we need Zoos : a. think animals should live in their natural habitat b.believe animals are protected in zoos c.wish people would make donations to zoos d. want to help wild animals, esp. endangered ones.
June 4, 2015

math
A 110lb woman is started on a nitroglycerin IV drip. The order is to administer the Nitro at mcg/min. The pharmacy sends a 250 ml IV container with 25 mg of nitro added to the container. What is the flow rate in ml/hr that the IV should run?
June 1, 2015

math
How many mls of 45% dextrose and 15% dextrose do you need to make 780 mls of 35% dextrose
June 1, 2015

math
How many mls of 55% Dextrsoe and water do you nee to make 980 mls of 27.5 Dextrose? No clue on what to do.
June 1, 2015

Algebra 2 Honors
You sure its not -3/81 = y/9? My answer came out as -1/3 and I solved in 2 different ways.
May 11, 2015

Algebra 2 Honors
Well, I'm having trouble on some of my homework questions and looking to get help as soon as possible on one of them about inverse variation. 1. If y varies inversely as x and y = -3 when x = 9, find y when x = 81. I will use the equation y = k/x but I have no idea how to ...
May 11, 2015

Physics
Consider a situation where immediately after birth, twins are separated. One continues to live on earth, while the other is whisked away in a space ship at 90% of the speed of light. After 65 years they are reunited. Will they look the same? Show proof of your answer through ...
May 10, 2015

Physics
Which of the following is correct for the two coherent light waves to produce zero light? The light waves should travel in perpendicular directions. The light waves are in phase with each other. The light waves are out of phase with each other. The light waves should pass ...
May 10, 2015

Algebra
It’s the end of the semester, and sisters Sarah and Chelsea are eager to head home for the summer. It’s a long drive, and Sarah’s old car can manage an average speed of only 55 miles per hour, so she leaves early in the morning. An hour later, Chelsea follows ...
April 24, 2015

Algbra
It’s the end of the semester, and sisters Sarah and Chelsea are eager to head home for the summer. It’s a long drive, and Sarah’s old car can manage an average speed of only 55 miles per hour, so she leaves early in the morning. An hour later, Chelsea follows ...
April 24, 2015

math
0.25 this website is a joke the answer was wrong
April 15, 2015

english
15. Identify the sentence in which the underlined pronoun is used incorrectly. There are only six days left in the school year. It will be fun to visit their house in the summer. Their just going to have to wait to see the movie. Greg refused to go there because of the bad ...
April 10, 2015

chemistry
first set 2.34*10-59= (5x)^5*(3x)^3(1x)^1 which is from the balanced equation. you will get 84375(x)^9=2.34*10-59= 8.67*10-8 mol/liter then you take the 502 grams/ mol and the 1 liter and multiple them all together to get 4.35*10^-5
March 29, 2015

Physics
A 1.42 kg ball is connected by means of two massless strings, each of length L = 1.29 m, to a vertical, rotating rod. The strings are tied to the rod with separation d = 1.29 m and are taut. The tension in the upper string is 48.0 N. What are (a) the tension in the lower ...
March 14, 2015

Chemistry
6Li(s) + N2(g) 2Li3N(s) a) What mass of lithium is required to produce 0.575 g of Li3N in the balanced reaction? b) What mass of nitrogen is required for the reaction? ------------------------------------------- I tried dimensional analysis in a couple different ways but I ...
March 8, 2015

Math
For the first of two basketball games the price of each reserved seat was \$1.50,the price of each unreserved seat was 5 cents, and the number of reserved seats sold was 1/25 of the number of unreserved seats sold.If, at a second game, the price of the reserved seats is to be ...
March 3, 2015

Chemistry
What is the name of the substance with formula Cu(H2O)6SO4?
February 17, 2015

Chemistry, HELP!!
Write two hydrolysis reactions for Cu^2+ reacting with water in each step to form CuOH^+ and Cu(OH)2. The hydrolysis constants for the two reactions are: log kh1 = -7.7 and log Kh2 = -6.1
February 8, 2015

physics
An object falls a distance h from rest. If it travels 0.45h in the last 1.00 s, find the time and the height of its fall.
February 6, 2015

physics
A stone is dropped into a river from a bridge 43.8 m above the water. Another stone is thrown vertically down 1.65 s after the first is dropped. Both stones strike the water at the same time. What is the initial speed of the second stone?
February 6, 2015

physics
The figure gives the acceleration a versus time t for a particle moving along an x axis. The a-axis scale is set by as = 15.0 m/s^2. At t = -2.0 s, the particle's velocity is 7.00 m/s. What is its velocity at t = 6.0 s?
February 6, 2015

the unit is in amu unit
February 4, 2015

Carbon tetrachloride contains one carbon and four chlorine atoms. For this compound 11.818 g of chlorine combine with 1.000 g of C-12. Using this information, calculate the atomic mass of chlorine.
February 4, 2015

Physics
7. An early objection to the idea that the earth is spinning on its axis was that the earth would turn so fast at the equator that people would be thrown into space. Show the error in this logic by calculating the centripetal force needed to hold a 100. kg person in place at ...
February 2, 2015

math
Given only an 11 liter jug and an 8 liter jug, each with no markings, find the method of using the two jugs to measure out eactly 1 liter of water while using the smallest amount of water. Argue clearly why you think that your procedure uses the smallest amount!
January 9, 2015

geometry
how do you find the speed of the plane 130 miles per hour, cross wind 20 miles hour
December 27, 2014

marh
Daryl reaned 426 points out of 500 points in English class. Which represent approximately represents Darl's points?
December 16, 2014

Calc I
Find an equation of the tangent to the curve at the given point. y=4(sinx)^2 point: pi/6,1) So I took the derivative of the original function to get: y' = 8cosx*sinx I then chose a point to plug in to find a point for the slope. i picked pi/6 because i thought it would be ...
December 7, 2014

Calc I
if f(t)=sqrt(4t+1) find f''(2) I got the first derivative to be: 1/2(4t-1)^-1/2 * 4t^3 and i'm trying to figure out if i need the product rule again to find the second derivative -1t^3(4t-1)^-3/2 * 4t^3 The answer if -4/27 and I'm not sure how to get that if I...
December 7, 2014

Calc I
Find the derivative of y=(x^2 + x^3)^4 What I got: 4(x^2+x^3)^3 * (2x+3x^2) The correct answer: 4x^7(x+1)(3x+2) How did they get that?
December 7, 2014

chemistry
H2CO3 (aq) + 2OH- (aq)CO32- (aq) + 2H2O (l)
December 5, 2014

Chemistry (Electrochemistry)
The standard potential for the following galvanic cell is 1.72V : Be(s)|Be2+(aq)||Pb2+(aq)|Pb(s) The standard reduction potential for the Pb2+/Pb half-cell: E = -.13V Calculate the standard reduction potential for the Be2+/Be half-cell. What I know: Be is the anode Pb is the ...
December 5, 2014

college algebra
I'm going to assume that the only thing under the square root symbol is the 2. Write your equation with a "y" on the left side: y = √2x+9 And then to find the inverse, you first just switch the x's and the y's, and get, x = √2y+9 And then you ...
December 1, 2014

statistics
A simple random sample of students is selected, and the students are asked how much time they spent preparing for a test. The times (in hours) are as follows: 1.3 7.2 4.2 12.5 6.6 2.5 5.5 Based on these results, a confidence interval for the population mean is found to be &...
November 30, 2014

CALC 1
Suppose that h is a function with h'(x) = xe^x. Find all intervals where the function h is concave up. Now, I understand that concavity is determined by the second derivative, so what my question here is, is it just taking the first derivative and then taking it again? Is ...
November 30, 2014

Calculus I
Hmm, even so though, it doesn't make too much sense. V=x^2h = 100 h= 100/x^2 C = x^2 + 4xh C= 10x^2+4(1)xh C= 10x^2+4x(100/x^2) 10x^2+400x/4x^2 C= 10x^2 + 100/x C'(x) = 20x-100/x^2 20x^3=100 x^3 = 5 5^(1/3) = 1.7099 y = 100/5^(1/3) y = 58.5 That seems like a lot for a ...
November 28, 2014

Calculus I
An open box with square base is to be constructed. The material for the base costs \$10 per square foot. The material for the sides costs \$1 per square foot. the box must have an area of 100 square feet. Find the dimensions of the box that minimize cost. What I have so far: A...
November 28, 2014

Math
A ball rebounds the ground to a height of 72 cm, and each time it rebounds to two thirds of the height. Estimate the total distance the ball travels before it comes to rest
November 22, 2014

math
868.3844538698p568u4
November 17, 2014

physics
In the figure, a 4.3 kg block is accelerated from rest by a compressed spring of spring constant 660 N/m. The block leaves the spring at the spring's relaxed length and then travels over a horizontal floor with a coefficient of kinetic friction μk = 0.260. The ...
November 15, 2014

riga technical university
At what concentration of silver electrolyte the potential of the silver elevtrode will be greater than 0.1V of the silver electrode standard potential?
November 4, 2014

programming
create the logic for a program that calculates and displays the amount of money you would have if you invested \$5000 at 2 percent simple interest for one year. create a separate method to do the calculation and return the result to be displayed.
October 28, 2014

Math
Tina is trying to choose finger food for her party. She is choosing between 5 types of nuts, 5 types of crackers, and 4 types of cheese. If Tina chooses one of each,how many combinations does she have to choose from?
October 18, 2014

physics
A railroad flatcar is loaded with crates having a coefficient of static friction of 0.394 with the floor. If the train is moving at 57.1 km/h, in how short a distance can the train be stopped at constant acceleration without causing the crates to slide?
October 16, 2014

English
Which pronoun fits. Another boy and him/he won blue ribbons for their work.
October 14, 2014

physics
An 80 kg skateboarder going 10 m / s is launched nearly vertically off a ramp as shown. Approximately how high does he go?
October 11, 2014

english
what three jobs besides author did david keys have.
October 10, 2014

Chemistry
v is1/2 mv squared 2
October 10, 2014

History -- two questions?
October 6, 2014

History -- two questions?
the first one is Muslims from Afghanistan the second one is right!
October 6, 2014

Chemistry, HELP!!
a) If the volume of a flask is 165 mL and the mass of the vapor in the flask is 0.2136 grams, what is the density of vapor in the flask? b)If the temperature of the vapor is 25 degrees Celsius, what is the molecular weight of the vapor? (Assume the gas pressure to be 1.00 atm.)
September 23, 2014

Chemistry, empirical formula
Determine the empirical formula for the following compounds with these compositions (by mass): a) Cr 47.7% F 52.3% b) Na 42.1% P 18.9% O 39.0%
September 23, 2014

Lunch
It doesn't even make sense :)
September 22, 2014

memorial
How I can do this abswer
September 19, 2014

Math
I understand that part, but what about the subintervals
September 11, 2014

Math
consider the polynomial (x-a)(x-b)and the real number line Identify the points on the line where the polynomial is zero. In each of the three subintervals of the line, write the sign of each factor and the sign of the product.For which values does the polynomial possibly ...
September 11, 2014

physics
a large aircraft accelerates sown the runway for a distance of 3000m before leaving the ground. It then climbs at a steady 3 degree angle. After the plan has travelled 4000m along this new trajectory, how high is it and how far horizontally is it from its initial position?
September 9, 2014

Math
297x^2 - 167x - 100 Can someone help me find the roots of this
September 8, 2014

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