Darren
Newest questions and responses by Darren
math
The dilation D: (x, y) → (0.2x, 0.2y) has been applied to the polygon S(–5, 5), T(–5, 10), U(5, 15). What are the coordinates of the image points? a S'(–1, 1), T'(–1, 2), U'(1, 3) b S'(–4.8, 5.2), T'(–4.8, 10.2), U'(5.2, 15.2) c S'(–5.2,
asked on December 18, 2017 
Maths
A square prism and square pyramid have the same base and the same surface area. Show that the slant height, l, of the pyramid is l=5/2 x s where s is the length of the base.
asked on May 8, 2017 
algebra
5:11 and 6:12 7:13 and 21:39 8:14 and 24:30 10:20 and 20:30 which pair of ratios form a proportion?
asked on March 24, 2017 
math
A step ladder 2.2m high was opened making an angle of 30° Calculate distance between legs of ladder
asked on October 5, 2016 
chemistry
If 10.0 L of butane and oxygen are combined at the same temperature and pressure, which gas will be left over after reaction? Include your calculation/reasoning.
asked on September 24, 2016 
math ples help
Please help.. How to answer if.. 2log8/6 + 2^2log3  2log12 Thank you so much
asked on March 5, 2016 
Chemistry, pH
What is the (OH) when pH = 4.25
asked on March 8, 2015 
Calculus
Hi. I need help with finding the derivative of the function: y= [(sec^7 x)/7]  [(sec^5 x)/5] Thanks!
asked on September 30, 2014 
Calculus
Hi! I need help finding the derivative of this function. f(x)= ln [(x(x1))/(x2)] Thank you.
asked on September 30, 2014 
Math
Given the following prime factors, determine the original number as well as all of its factors. 2*3*5*7 I know that 2*3*5*7 is 210 but I don't know what to do next.
asked on September 29, 2014 
Psychology
Indicate the independent variable and dependent variable: A research psychologist, working in a federal prison, is asked to assess the effectiveness of a new life skills program in promoting problemsolving skills. From a pool of 70 inmate volunteers, the
asked on October 8, 2013 
Geometry
A diver is currently at the surface of the water out at sea. If he descends into the ocean at an angle of depression of 32 degrees, what will be his depth to the nearest tenth of a foot after swimming for 5 minutes
asked on June 15, 2013 
Physics
Physics Help!!!!! Maximum Kinetic Energy based on a graph? A 2.50kg ball is attached to an unknown spring and allowed to oscillate. The figure shows a graph of the ball’s position x as a function of time t.(Figure 1) Part A: What is the maximum kinetic
asked on May 1, 2013 
statistics
Given that the general population is normally distributed on a standard scale measuring math aptitude with Mean = 50 (s.d. = 10), approximately what percentage of the population has a math aptitude score between 40 and 60?
asked on March 3, 2013 
Calc
Find the area between the x axis and the graph of y = (2e^x)/(1+e^(2x)) a. e^2 b. pi c. pi/2 d. 2pi d. none of the above
asked on January 25, 2013 
Calc
Calculate the area under the curve y=e^x above the x axis on the interval [1, infinity). a. infinity b. 0 c. 1/e d. 1/e e. none of the above
asked on January 25, 2013 
Calc
Evaluate the integral or show that it diverges: Integrand 0, lower, to 3, upper, (1/x)dx. a. infinity b. negative infinity c. 0 d. ln 3 e. none of the above
asked on January 25, 2013 
Calc
Find the limit as x approaches 0: (e^x^21)/(2x^2) a. 0 b. 1/2 c. infinity d. does not exist e. none of the above
asked on January 25, 2013 
Calc
Evaluate the integral (3x+4)/[(x^2+4)(3x)]dx a. (1/2)ln(x^2+4) + ln3x + C b. (1/2)arctan(x/2) + ln3x + C c. (1/2)arctan(x/2)  ln3x + C d. ln(sqrt(x^2+4)/(3x)) + C e. None of the above
asked on January 25, 2013 
Calc
Compute the average value of f(x) = x/(x+3) over the interval [a,a], 0 < a < 3. a. 1 + (3/2a)ln[(3a)/(3+a)] b. 2a + 3ln[(3a)/(3+a)] c. 3/(9a^2) d. 1/(2a) e. None of the above
asked on January 25, 2013 
Math
93*3^26^24^3
asked on January 7, 2013 
math
the gift box fits 2 layers of 10 cubic inches. what is the volume of the box.
asked on December 16, 2012 
Physics
Calculate a space shuttle territory 250 km above Earth's surface. Earth's mass is 6.0 * 10^24kg and its radius is 6.38 * 10^6 m (6380km)
asked on October 18, 2012 
Physics
A 1800kg car experiences a combined force of air resistance and friction that has the same magnitude whether the car goes up or down a hill at 28 m/s. Going up a hill, the car's engine produces 52 hp more power to sustain the constant velocity than it
asked on October 15, 2012 
Math
An external sinusoidal force is applied to an oscillating system which can be modelled by a model spring and a damper. The general solution of the equation of the motion is given by, x = 5 + 3.071cos(2πt – β) + 3.14exp(7.96t) cos(αt + φ) where α,
asked on September 3, 2012 
Math
A particle A of mass 2.11 kg collides with another particle B of mass 3.86 kg. Their initial velocities are u1 = 2.16i + 0.88j and u2 = 0.7i + 1.12j just before impact. After collision, they both merged and becomes a composite particle, which travel with a
asked on September 3, 2012 
Algebra 2
(x^3+8) x ((x2)/(x^22x+4))/ (x^24)/(x6)
asked on March 5, 2012 
Statistics
The average age of vehicles registered in the united states is 96 months, with a standard deviation of 16 months. If a random sample of 36 vehicles is selected, find the probability that the mean of their ages is between 90 and 100 months. Provide four
asked on March 4, 2012 
chemistry
The purity of a pharmaceutical preparation of sulfanilamide, C6H4N2O2S, can be determined by oxidizing the sulfur to SO2 and bubbling the SO2 through H2O2 to produce H2SO4. The acid is then titrated with standard NaOH. Calculate the purity (%w/w
asked on February 15, 2012 
chemistry
A 0.4515 g sample of pure CaCO3 was transferred to a 500 mL volumetric flask and dissolved using 6M HCl then diluted to volume. A 50.00 mL aliquot was transferred to a 250mL Erlenmeyer flask and the pH adjusted. Calmagite was used as an indicator the
asked on February 15, 2012 
chemistry
The amount of Fe in a 2.0008 g sample of an iron ore was determined by a redox titration with K2Cr2O7. The sample was dissolved in HCl and the iron brought to a +2 oxidation state. Titration required 26.48 mL of 0.034 M K2Cr2O7. Calculate the iron content
asked on February 15, 2012 
GPA help
if i had a 1.875 and i get a C to go up to a B what is my GPA? will it be a 2.0? i need help i want to play baseball.
asked on January 23, 2012 
English
if i had a 1.875 and i get a C to go up to a B what is my GPA?
asked on January 23, 2012 
French
Can someone please help edit my French? My French: Quelles matières étudiezvous cette année ? Moi, je fais deux les maths, la chimie, la physique, l’anglais et le français. Je n’aime pas les maths parce que il y a beaucoup des devoirs pour les
asked on January 20, 2012 
Algebra 2
You are designing a kit for making sand castles. You want one of the molds to be a cone that will hold 48π cubic inches of sand. What should the dimensions of the cone be if you want the height to be 5 inches more than the radius of the base?
asked on December 30, 2011 
math
24+1+1/8
asked on December 5, 2011 
chem
What volume of a 8.50M Na2CO3 solution would be required to prepare 220.00mL of a 8.20%w/v Na2CO3 solution?
asked on November 29, 2011 
chem
mix 35.50 mL of a 0.201 M solution of K2CrO4 with 35.50 mL of a 0.201 M solution of AgNO3, what mass of solid will form?
asked on November 29, 2011 
phsyics HELP PLEASE
A 40.6kg crate rests on a horizontal floor, and a 69.1kg person is standing on the crate. Determine the magnitude of the normal force that (a) the floor exerts on the crate and (b) the crate exerts on the person.
asked on November 29, 2011 
physics
In a European country a bathroom scale displays its reading in kilograms. When a man stands on this scale, it reads 90.4 kg. When he pulls down on a chinup bar installed over the scale, the reading decreases to 79.5 kg. What is the magnitude of the force
asked on November 29, 2011 
phsyics
A 40.6kg crate rests on a horizontal floor, and a 69.1kg person is standing on the crate. Determine the magnitude of the normal force that (a) the floor exerts on the crate and (b) the crate exerts on the person.
asked on November 28, 2011 
physics
In a European country a bathroom scale displays its reading in kilograms. When a man stands on this scale, it reads 90.4 kg. When he pulls down on a chinup bar installed over the scale, the reading decreases to 79.5 kg. What is the magnitude of the force
asked on November 28, 2011 
physics,
A student presses a book between his hands The forces that he exerts on the front and back covers of the book are perpendicular to the book and are horizontal. The book weighs 30.8 N. The coefficient of static friction between his hands and the book is
asked on November 28, 2011 
Phsyics
A 40.6kg crate rests on a horizontal floor, and a 69.1kg person is standing on the crate. Determine the magnitude of the normal force that (a) the floor exerts on the crate and (b) the crate exerts on the person.
asked on November 28, 2011 
Math Pre calculus
A community birdwatching society makes and sells simple bird feeders to raise money for its conservation activities. The materials for each feeder cost $5, and the society sells an average of 20 per week at a price of $9 each. The society has been
asked on November 1, 2011 
algebra
The product of two consecutive positive even numbers is 840. What are the numbers? (Enter solutions from smallest to largest.)
asked on October 22, 2011 
Math
Solve the equation. (Enter solutions from smallest to largest. If there is no solution, enter NONE in the answer boxes.) 4x^2 = 7x + 2
asked on October 22, 2011 
Physics
You are holding a 5 kg dumbbell straight out at arm's length. Assuming your arm is 0.63 m long, what torque is the dumbbell exerting on your shoulder?
asked on October 10, 2011 
math
I'm having trouble solving this problem: definite integral (2t)(sqrt(t)), 0..2
asked on September 24, 2011 
Math
What property changed(4c + 3c) + 6 to (4+3)c + 6?
asked on September 11, 2011 
pre algebra
Solve for m. 6m  7 = 5m + 3
asked on May 19, 2011 
Physics
Suppose you wish to visit a star which is 450 light years away, and that you want your 21000 kg rocket to move so fast that you only age 20 years during the round trip. a. How fast must the rocket travel relative to the Earth? Give your answer as the
asked on May 5, 2011 
Physics
a)What speed must one frame of reference be moving relative to another for the two to disagree about the length by 1% b)What speed must one frame of reference be moving relative to another for the two frames to disagree about time intervals by 1%? Both
asked on May 5, 2011 
Physics
At what speed must one frame of reference be moving relative to another for the two frames to disagree about lengths by 1%? Express your result as a fraction of the speed of light. At what speed must one frame of reference be moving relative to another for
asked on May 3, 2011 
Physics
A rocket cruising past Earth at 0.79c shoots two bullets at 0.92c relative to the rocket with one of the bullets fired along the direction of the rocket's motion and the other fired opposite the rocket's motion. (a) What velocity does an Earthbased
asked on April 29, 2011 
Math
An airplane takes off in a straight path. When it has traveled 5 km, it is 3 km high. To the nearest kilometer, what is the horizontal distance, d that the airplane has flown over?
asked on April 28, 2011 
chemistry
A 0.040M solution of a weak acid has a pH of 3.02 at 25°C . What is the value of Ka for the acid?
asked on March 15, 2011 
chemistry
What are the concentrations of H3O+ and OH and what is the pH of a 0.15 M solution of Na2CO3 (at 25 °C).
asked on March 15, 2011 
accounting
I'm stumped in reference to figuring the answer for the following question. If anyone can help I would be so thankful. The question is as follows: A county fire department receives property tax revenue on a 55% (December), 40% (April), 5% (June) basis. The
asked on January 2, 2011 
Media Studies
Hi there, I need to make a response to this quote, could anyone give me ideas of what this quote might mean in relation to media today. "The Internet is to News, What Car Horns are to Music" Thanks.
asked on November 17, 2010 
health
When HIPAA requires auhtorization to disclose information the authorization must
asked on November 5, 2010 
Englsih, Sonnets
Can someone help me with Sidney Sonnet 31 and 39 questions? The sonnets are at the bottom if you need them. 1. The unifying theme of Sidney's Sonnets 31 and 39 is... a. natural beauty b. hopeless love c. relief from pain d. endless suffering 2. Which of
asked on October 28, 2010 
algebra
A person bought 17 gifts for his nieces and nephews. The gifts were dolls for the nieces at $12.99 each, and robots for the nephews at $10.99 each. The total spent was $198.83. How many of each gift was bought?
asked on October 1, 2010 
10th grade
scientist needs 5L of 12% solution. She has on 10% and 17% solution. How much of each does
asked on October 1, 2010 
Vectors
Could someone help me solve these system using elementary operations, I am having trouble with both of them. x+y+z =0 xy =1 yz =5 (For the one above the answer is (1,2,3) 2xy =0 2yz =7 2zx =0 (For the one above the answer is (2,4,1)
asked on June 1, 2010 
Vectors
Could you please help me solve this question: Solve this system of equations using elementary operations. 1. x/3 + y/4 + z/5 =14 2. x/4 + y/5 + z/3 =21 3. x/5 + y/3 + z/4 =7 So far, I have multiplied all three equations by 60, to turn them into whole
asked on May 25, 2010 
Biology
Why is there electrical activity in the brain? Describe how it is used by neurons.
asked on May 16, 2010 
English
Hi there, I am doing a presentation comparing women in Hamlet times to women today. But i need help finding a cartoon representing women from Hamlet's time. Please direct me to links for this.
asked on May 11, 2010 
Vectors
A mass 0f 10kg is suspended by 2 pieces of string, 30 cm and 40 cm long, from twp points that are 50cm apart and at the same level. Find the tension in each piece of string.
asked on May 5, 2010 
neighborhood know how!
all neigh have rights.with these rights come responsibilities.draw a picture of a responsible neighbor.
asked on March 24, 2010 
bsa 375
Why is a systems development process needed? What is the objective of each phase of the SDLC? Describe briefly? How important are feasibility studies. The text mentions four types of feasibility studies: operational, technical, economic, and schedule. In
asked on March 20, 2010 
cummunity helper project
my cummunity helper is a
asked on March 1, 2010 
Social Studies
what would happen if wheat was no longer a resource to the U.S.
asked on April 30, 2009 
out of curiosity...
does anyone know what is the pathway used to board an airplane? the bridgelike pathway that connects to the doors of the plane and are used to board and go off the plane? answer would be greatly appreciated..tnx :)
asked on March 12, 2009 
Intro to Accounting
Les Fleurs, a boutique in Paris, France, had the following accounts in its accounting records at December 31, 20X2 (amounts in Euros, denoted as "E") Purchases………………... E250,000 Freight In……………… E8,000 Sales discounts………….
asked on March 3, 2009 
diction
what is the opposite of cohesive but still using cohesive in it incohesive?
asked on November 12, 2008 
Naming
what are people from rhode island called? rhode islanders?
asked on November 12, 2008 
writing
PRONOUN REFERENCES. EMPLOYEES ARE BEGINING TO TAKE ADVANTAGE OF THE COMPANY'S ATHLETIC FACILITIES. THEY OFFER SQUASH AND TENNIS COURTS, A SMALL TRACK, AND SERVERAL TRAMPOLINES.
asked on September 9, 2008 
math
solve for x. 1.25x^2=13 2.2(x5)^2=3
asked on March 21, 2008 
algbra
Write your answer with only positive exponents. y^5y^10
asked on February 17, 2008 
science
Scientists debate about the use of fossils as a tool to determine records of various events, such as the vanishing of the dinosaurs or the origin of our ancestors.discuss the role of fossils in helping scientists develop accurate records of the geologic
asked on February 14, 2008 
algebra
I don't know how to find the GCF if the variables are different. For example, 48a^3 and 16b^5.
asked on February 8, 2008 
math right triangle
the hypotenuse of a right triangle is 1 inch longer than one leg and 8 inches longer than the other. Find the length of each side of the triangle. Let l1, l2 be the legs. l1^2 + l2^2 = h^2 but h= l1+1 and h= l2 + 8 solve these for l1, l2, put them in the
asked on December 5, 2006

Chemistry
I don't know lot but you have done right welldone I am doing PhD in chemistry
posted on November 21, 2017 
Accounting
These were the present values I had obtained. 1. PV = 1,180,000 2. PV = 671476 3. PV = 1,087,033 4. PV = 1,204,627 4 is the one I had trusted myself least on.
posted on April 26, 2017 
Higher Chem
16.11008228
posted on January 18, 2017 
math
dontknow
posted on January 3, 2016 
math
I don't know the answer
posted on October 14, 2015 
Chemistry, pH
im confused, is the answer 1.77827941x10^10 or 5623413252????
posted on March 8, 2015 
algerbra
can you plz explain 693 = 9x7x11 so we would need multipliers of 7 and 11 to yield a perfect square so 693x7x11 = 9x49x121 Thanks
posted on December 18, 2014 
Calculus
Ohh I see. Thank you!
posted on September 30, 2014 
Calculus
I'm a little confused though.. Where did you get the (1/7) and (1/5) in the second line?
posted on September 30, 2014 
Calculus
Thank you Reiny!
posted on September 30, 2014 
Calculus
Thanks Sarah!
posted on September 30, 2014 
U.S/history AP
Hi, what are evidence of the 2 superpowers in the cold war.
posted on April 14, 2013 
Math (Please help immediately)
x+y=180 y= x+38 x+(x+38)= 180 2x+38=180 38 =38 2x = 142 x= 71 plug it in equation 71+71+38= 180 angle 1 = 71 angle 2 = 109
posted on September 6, 2012 
Math (Please help immediately)
angle 1= x angle 2=8x so 8x+x=180 9x=180 9x= 180 divided by 9 is 20 so x=20 angle 1=20 angle 2=160 Hope it helps :)
posted on September 6, 2012 
Math (Please help immediately)
You know complementary angles add up to 90 degrees so let x = one angle let 3x = the other angle x + 3x = 90 4x = 90 x = 22.5 degrees so one angle (x) is 22.5 and the other (3x) is (3 x 22.5) = 67.5
posted on September 6, 2012 
Physics
the speed of sound in air is 343 m/s. using the relationship: 5280 feet in a mile, 3 feet in a yard and 3.3 feet in a meter. how many meters is this?
posted on September 3, 2012 
pre algebra
It's 5m not 5m
posted on May 19, 2011