Friday
July 1, 2016

Posts by Robin

Total # Posts: 393

Physics
A 50.0-kg boy runs on a horizontal surface at a speed of 10.0 m/s and jumps onto a cart just before reaching a slope as shown in the figure. The cart is initially at rest. If the mass of the cart is 150 kg, what is the maximum height h the boy/cart will reach up the slope ...
May 24, 2016

Calculus
I apologize! I forgot the prime mark after (f^-1)'(2). Thank you for catching that, you clearly know better what I ment than I did! So for clarification to compute (f^-1)'(2) if f(x) = 7x + 3cos(x) + 2sin(x), it would be 1/(-3sin(2) + 2cos(2)? Thats the answer? Because...
April 18, 2016

Calculus
Compute (f^-1) (2) if f(x) = 7x + 3cos(x) + 2sin(x).... We tried solving it in the form (f^-1)(a) = (1/f'(f^-1(a))... or is this a u-sub problem? We are trying to figure out whose way is right with one getting the answer as 1/2 and the other 1/10... we are getting mixed up...
April 18, 2016

Percent
Julian's measurement was 105 percent of 50 pounds and Amanda's measurement was 95 percent of 50 pounds. How many pounds off was Julian's measurement? How many pounds off was Amanda's measurement? Did they both have the same percent error?
April 15, 2016

Percent error math
Julian's measurement was 105 percent of 50 pounds and Amanda's measurement was 95 percent of 50 pounds. How many pound off were each? Do they have the same percent error? I got 5 percent error for both even though Amanda was -5
April 15, 2016

Math grade 7
The city treasury began with $1,100,000 at the beginning of the year. Each day since tax revenues have come in at a rate of 12,500 per day. Expenditures each day average 15,000 per day. The treasury now has less than1,000,000. How many days d has it been since the beginning of...
April 15, 2016

Chemistry
Ment to write that PbCl2 in the conjugate base of HCL, not HCL is the conjugate base of PbCl2.... sorry about that!
April 11, 2016

Chemistry
Explain why the solubility of PbF2 is pH dependent, but the solubility of PbCl2 is not. I know the solubility of PbF2 is pH dependent because the solubility would increase as the solution becomes more acidic because the F^- ion is the conjugate weak base of the weak acid HF. ...
April 11, 2016

Algebra
Form a third degree polynomial function with real coefficients such that -7 + i and -9 are zeros
March 21, 2016

algebra
I am thinking of two numbers whose sum is 5. If I add the second number to twice the first number, I get 2. What are the two numbers
February 2, 2016

College Algrebra
Joel can run around a 1/4 mi track in 66 sec. Jason can run around the track in 60 sec.If the runners start at the same point on the track and run in opposite directions, how long will it take the runners to cover 1/4 mile?
January 25, 2016

Physics
A car starts from rests and accelerates at a rate of 4 feet per second squared. How far does the car travel in 10 seconds?
January 23, 2016

Chemisty
object a has a specific heat of 0.568 j/[(g)(°C)] and object B has a specific heat of 1.34 J/[(g)(°C)]. which o ject A or B will heat up faster and why Is is A because it is closer to 0?
January 21, 2016

math
sarah sailed 12 miles due south from a buoy. Then she sailed 11 miles due west. How far was she from the buoy. estimate to the nearest 10th.
January 10, 2016

biology help please :)
The answer is B
January 6, 2016

Math
taylor bought some shirts for her clothing store for $12 each. She received $40 off her entire purchase and spent a total of $200. Write an equation to find the number of shirts Taylor purchased for her store.
December 14, 2015

Chemistry
Adding 1.00 g of benzene, C6H6, to 80 g of cyclohexane, C6H12, lowers the freezing point of the cyclohexane from 6.5 to 3.3 degree celsius. What is the value of kf for cyclohexane?
December 2, 2015

math
Bass: The bass in Clear Lake have weights that are normally distributed with a mean of 2.3 pounds and a standard deviation of 0.6 pounds. (a) If you catch one random bass from Clear Lake, find the probability that it weighs less than 1 pound? Round your answer to 4 decimal ...
October 26, 2015

Math
Vehicle can travel 0-60mph in 7.6 sec. From a dead stop, what is the highest rate of speed vehicle can reach and decelerate to 10mph in 500 ft distance?
October 12, 2015

St Katerina
How to find the width of a rectangular pen area of 176 meter square and 16 meter long?
September 23, 2015

math
How many pairs of integers $(b,c)$ satisfy the equation \[\frac{b + 7}{b + 4} = \frac{c}{9}?\]
September 15, 2015

MRGS SCHOOL.
State the fundamental theorem of Arithmetic.
June 30, 2015

geometry
got a parallelogram ABCD = 100 sq in. AC=2 times BD. what is CD and BD? the diagonals AC divided into AE=2x and EC =2x, diagonal BD is divided into BE=x and ED=x. I got x=1. So line AC=2x or 4x? line BD=x or 2x? so, 100 sq in 0divided by 3x or 6x. Or did I goof?
May 26, 2015

geometry
I have 2 problem that I don't know if I did it right. 1) right triangle with base=12 altitude=c, hypotenuse=d. 71 degrees is opposite 90 degrees. need to find C and d. I did tan 71=d/12. = 12 x 2.9042 = d = 34.85 Do I do the same process to get c? 2) right triangle with ...
May 18, 2015

geometry
I need d and e. Have a right triangle. Base=d; hypotenuse=e; altitude= 2sqrt3. < opposite 90 = 60.
May 15, 2015

Statistics
A random sample of 150 pumpkins is obtained and the mean circumference is found to be 45 cm. Assuming that the population standard deviation is known to be 1.8 cm, use a 0.03 significance level to test the claim that the mean circumference of all pumpkins is greater than 38 cm.
May 9, 2015

Algebra 2
A freely falling object hit the ground in 18𝑎! seconds. It fell ℎ feet. Use the formula ℎ = 16𝑡! to find ℎ in terms of 𝑎.
May 1, 2015

geometry
I sent question about rt triangle, ABC, needing to find a & b. altitude was 4, base a and hypotenuse b. You mentioned knowing another angle. There is one < A is 45 degrees. Thanks for all your help. Math is not an easy subject for me.
April 25, 2015

geometry
I tried to do this problem but the answer doesn't jive. Circle C has a radius of 13. Chord AB is 10. Find the distance from the center of the circle to chord AB which is labeled CD. I labeled CD = x. 1/2 of AB = 5. The line segment CB (13) is the same os CD (x). I tired x ...
April 24, 2015

geometry
circle E with a diameter AC and m<DAC = 62 degrees, calculate the following m<BAC arc m<AD m<ABD and m<DBC
April 24, 2015

geometry
what got sent looks like ??. I need x & y. I'll try again C | \ | \ y 9 | \ | \.D 90de< | x /\ | / \ 8 90de< B .____/______\. A 2 E 10
April 21, 2015

geometry
for Remy I need x and y. tri< ABC similar to tri< ADE th you . | \ y | \ 9 | \. 90 deg < | / \ | x/ \ | / \ 90 deg < B.__/________\. A 2 10
April 21, 2015

geometry
I have right triangles I need to solve. Can you see if I am doing them correctly or screwed up..1) Rt < is in left corner C: Opposite is 60 deg< A, last angle is at top- 30 deg <. line segment of AB is 10. Hypo is f. I got 10 0r 12.5 for answer. 2) Triangle is ABC ...
April 20, 2015

geometry
I have a triangle ADB. AD = 2, AB = 3 DB is x. I need to find x. Additional info. AB/BC = BD/BD = AD/BD. Other triangle is DCB. DB is x, DC is 8, CB is y. Booth of triangles are connect by DB. Figure resembles a kite. (Needed to complete 3/y =x/x= 2/x. Is this correct?)
April 20, 2015

geometry
I did problem but would like someone to see if I did it correctly. triangle ABC similar to ADE by AA theorem need x and y. start at B and go rt. around the 2 connected triangles BA=12; (AD 8 with rest of line =y so have ADC = 8+y; CD = 9. Line DE = x. <D = 90 deg. So have ...
April 19, 2015

geometry
I need help. One diagram backward Z, has 2|lines intersected by another line. The upper corner on left is 32 degrees. coming down intersecting line, the bottom <Z is outside corner of figure. The other figure is a triangle. Left corner = x, rt. corner =46 degrees , top ?. X...
April 12, 2015

Physics
A uniform, 274-N rod that is 2.05m long carries a 225-N weight at its right end and an unknown weight W toward the left end.When W is placed 50.3cm from the left end of the rod, the system just balances horizontally when the fulcrum is located 78.0cm from the right end. i ...
April 12, 2015

Pre-calculus
bring 3 to the other side so now ur eqn will look like sqrt(5r-9)=sqrt(r+4)+1. now square both sides. when u do this u'll eventually get 2r-7=sqrt(r+4).you must square them both again to get rid of the square root. once u do this n simplify everthing u should get 4r^2-29r+...
April 11, 2015

geometry
sorry about nos. A(-3, 2) B (5, -4).calculate midpoint. Calculate length of AB, AM, and MB. Thanks again
April 6, 2015

geometry.
use midpoint formula to calculate the midpoint of AB. Name it point M and plot it in the graph. Calculate lengths AB, AM, MB. thanks for help.
April 6, 2015

geometry
Given m<XWY = 2x+5, m<YWZ = 5x-79, and m<XWZ = 122 degrees, M<XWZ = what (X) (y) (W) (Z) connect letters x to w, w to y, and w to z. Does WY bisect <XWZ. show work please th you
April 6, 2015

algebra
I asked a question and it was answered by Steve. He had the numbers wrong. The problem should be sqrt of 18 over (sqrt of 8)-3. not sqrt of 18 -3. I got 2+sqrt of 8. Is it correct?
March 25, 2015

algebra
how do you simplify (sqrt18)over(sqrt8)-3? And (4-3sqrt2)squared? I tried but get some unreal answer. thanks in advance.
March 24, 2015

Chemistry
Titration of Na2CO3 with HCl. (pKa1(H2CO3) = 6.352, pKa2(H2CO3) = 10.329) . Calculate the pH at each of the following volumes of 0.20 M HCl added to 20.00 mL of 0.10 M Na2CO3. I figured out everything except for adding 20.00 ml of 0.20M HCL. Please help asap.
March 23, 2015

algebra
how do you simplify 3j cubed - 51j squared + 210j? I have the answer as j(j(3j-51) = 210 or is it 3j ((j squared -17j + 70)? thank you for your assistance.
March 19, 2015

Organizing, analyzing and interpreting Data (scien
the actual volume of a ligquid is 24.5 mL. which of the sets of data indicates both accuracy and precison?
March 12, 2015

Calculus
What would an example of a logarithmic function that contains a radical within it and a quotient within it where you would need to use chain rule and quotient rule to take derivative look like? How would taking the derivative of the function in its original form look different...
February 12, 2015

Calculus
What would an example of a logarithmic function that contains two trig functions within it where you would need to use chain rule and product rule to take derivative look like? How would taking the derivative of the function in its original form look different when using log ...
February 12, 2015

English 2
That aids digestion is really true.
February 4, 2015

English 2
Water that aids digestion is really true.Identify the function of the noun clause.
February 4, 2015

Math
Thank you so much Yrafaj!!! Robin
February 3, 2015

Math
No, don't think what I wrote before is correct.
February 3, 2015

Math
So if 50 is half of what Tyler had then he had 100. Grace had 3 times Tyler so that would be 300. She ate 50 so she has 250 left (and a very bad stomach ache). If this is even correct is there some algebraic way to show the work??? This is just for a 4th grader and I have no ...
February 3, 2015

Math
Can't get started on this for my granddaughter: Grace had 3 times as many berries as Tyler. After Grace eats 50 berries she has half as many berries as Tyler. How many berries does Grace have left.
February 3, 2015

math
Thanks Ms. Sue.
January 28, 2015

math
I have 23 hundreds, 47 tens, 5 ones, 8 tenths and 10 hundredths. What number am I. We got the numbers to the left of the decimal - 2775 but to the right is it .81 or .18 or .9 as 10 hundredths is the same as 1 tenth so add 8 tenths and 1 tenth together? Thanks! Robin
January 28, 2015

Math
Great thanks Rose.
January 27, 2015

Math
Of the coins in Tricia's bank, 5/7 are quarters. If Tricia has 95 quarters in her bank, how many coins does she have in all. Is this correct? 5/7*x = 95 (7/5)(5/7)*x = 95 x= 95*7/5 95x7 = 665 665/5=133 x=133 Thanks from a Grandma helping w/4th grade math
January 27, 2015

Math
40+(40+13)=93 40+53=93
January 12, 2015

Math
Thanks!
January 12, 2015

Math
At a tournament, 2 different games went on for a total of 93 mins. If 1 game took 13 mins longer than the other, how long did it take to complete each game.
January 12, 2015

pre-algebra
how do i solve -x=-7
December 16, 2014

kendriya vidyalaya
How to write 22nd November 2014 in 9 letters
November 23, 2014

Chemistry
I figured it out. I got the wrong K value too. You have to take e^-(-1.893) so e^(1.893)=6.63 From there, K=(x)/(.3-x)(.4-x) where K=6.63 Solve for x and you get 0.178 To find the values, plug in 0.178 for x to find values at equilibrium.
November 6, 2014

Chemistry
I thought you would just set up an ICE table and subtract .15 from the reactants and add .15 to the product but that is not right.
November 6, 2014

Chemistry
A reaction: A(aq)+B(aq)<-->C(aq) has a standard free-energy change of –4.69 kJ/mol at 25 °C. What are the concentrations of A, B, and C at equilibrium if, at the beginning of the reaction, their concentrations are 0.30 M, 0.40 M, and 0 M, respectively? I know ...
November 6, 2014

college statistics
how many ways can a 3 person committee be formed from 12 people
November 5, 2014

math
2y+10x=10
October 25, 2014

math
2+2
October 5, 2014

Statistics
Assume that a procedure yields a binomial distribution with a trial repeated n times. Use the binomial probability formula to find the probability of x successes given the probability of success on a single trial, n=9, x=2, p=0.35.
August 25, 2014

Chemistry
which ka value would we use and would the concentrations of the acid and base be the same?
August 7, 2014

ALGERBRA
16 feet
June 13, 2014

albebra
solve arithmetically and algebraically. The perimeter of a rectangle is 54 cm. Its length is 6 cm. What is its width?
April 14, 2014

math
Jerry is 50 inches tall growing at a rate of 1/24 inches per month. Adam is 47 inches tall growing at a rate of 1/8 per month. If they continue to grow at these rates for the next 4 years in how many months will they be the same height? Solve two different ways and show ...
April 14, 2014

business communication CO210
Prepare a one-page description of your plans to solve the problem for one of the following research studies. Use the following headings for the problem:
April 8, 2014

Physics
A single force acts on a 1.1 kg particle-like object in such a way that the position of the object as a function of time is given by x = 4.1t - 3.6t2 + 4.5t3, with x in meters and t in seconds. Find the work done on the object by the force from t = 0 to t = 8.6 s.
March 8, 2014

Physics
The force on a particle is directed along an x axis and given by F = 1.7(x/2.8 - 0.95) where x is in meters and F is in Newtons. Find the work done by the force in moving the particle from x = 0 to x = 6.9 m.
March 8, 2014

Physics
Three vectors are given by: a=0i+oj+4.0k b=3.0i+-3.0j+-1.0k c=1.0i+2.0j+-1.0k a) Find a(bxc) b) Find a(b+c)
February 25, 2014

accounting
If on the opening day of business, you put in supplies worth $250 and $3000 cash, would that be considered a transaction OR would it be considered your beginning balances because it's the first day of business? Would it be considered beginning capital OR a credit to ...
February 24, 2014

Physics
Some insects can walk below a thin rod (such as a twig) by hanging from it. Suppose that such an insect has mass m and hangs from a horizontal rod as shown in the figure, with angle θ = 37°. Its six legs are all under the same tension, and the leg sections nearest the...
February 17, 2014

Physics
a vector with a magnitude of 17.6 m is directed at angle θ = 43o counterclockwise from the +x axis. What are the components (a) ax and (b) ay of the vector? A second coordinate system is inclined by angle θ' = 20o with respect to the first. What are the ...
February 9, 2014

Physics
A train at a constant 41.0 km/h moves east for 28 min, then in a direction 53.0° east of due north for 15.0 min, and then west for 64.0 min. What are the (a) magnitude (in km/h) and (b) angle (relative to north, with east of north positive and west of north negative) of ...
February 9, 2014

Physics
A plane flies 407 km east from city A to city B in 44.0 min and then 871 km south from city B to city C in 1.90 h. For the total trip, what are the (a) magnitude (in km) and (b) direction of the plane's displacement, the (c) magnitude (in km/h) and (d) direction of its ...
February 9, 2014

Physics
Three vectors are given by a= 0i+0j+4.0k , b= 3.0i+ -3.0j+-1.0k and c=1.0i+2.0j+-1.0k. Find (a) a(bxc) and (b)a(b+c)
February 9, 2014

Physics
For the vectors with a = 3.3 and b = 2.2, what are (a) the z component of AxB, (b) the z component of AxC, and (c) the z component of BxC?
February 9, 2014

Physics
A vector with a magnitude of 17.6 m is directed at angle θ = 43o counterclockwise from the +x axis. What are the components (a) ax and (b) ay of the vector? A second coordinate system is inclined by angle θ' = 20o with respect to the first. What are the ...
February 9, 2014

Physics
In the sum A+B=C, vector A has a magnitude of 10.2 m and is angled 48.0° counterclockwise from the +x direction, and vector C has a magnitude of 15.0 m and is angled 22.0° counterclockwise from the -x direction. What are (a) the magnitude and (b) the angle (relative to...
February 9, 2014

Physics
Oasis B is a distance d = 7.0 km east of oasis A, along the x axis shown in the figure. A confused camel, intending to walk directly from A to B instead walks a distance W1 = 22 km west of due south by angle θ1 = 15.0°. It then walks a distance W2 = 34 km due north. ...
February 9, 2014

Physics
Two trains, each having a speed of s, are headed at each other on the same straight track. A bird that can fly at speed 2s flies off the front of one train when they are d apart and heads directly for the other train. On reaching the other train it flies directly back to the ...
February 5, 2014

Physics
A particle starts from the origin at t = 0 and moves along the positive x axis. A graph of the velocity of the particle as a function of the time is shown in the figure; the v-axis scale is set by vs = 7.0 m/s. (a) What is the coordinate of the particle at t = 5.0 s? (b) What ...
February 5, 2014

Physics
Grains of fine California beach sand are approximately spheres with an average radius of 50 μm and are made of silicon dioxide, which has a density of 2.4 × 10^3 kg/m3. What mass of sand grains would have a total surface area (the total area of all the individual ...
January 30, 2014

Physics
A severe thunderstorm dumped 2.4 in of rain in 30 min on a town of area 35 km^2. What mass of water (in kg) fell on the town? One cubic meter of water has a mass of 103 kg.
January 30, 2014

Can someone plz help me?
4) The ratio of the number of tickets sold from Jane to Blake is 8:52. Simplify this to get 4/27. 10) Distance between starting line and first aid is 1.25 inches. Convert to miles: 2 inches=50 miles 1 inch=25 miles 1.25=1 mile and a quarter 50/4=12.5 25+12.5=37.5 miles from ...
November 26, 2013

Calculus
How can I get partial sums of a series on a TI 89 calculator?
November 26, 2013

Calculus
Calculate 20 terms for the sequence P0=-.5 and k=1.8, P0=.5 and k=2.8, and P0=.3 and k=1.8. Does the limit depend on the choice of P0? Does it depend on the choice of k?
November 25, 2013

Calculus
Solve the separable differential equation 10x−6ysqrt(x^2+1)dy/dx=0. with the initial condition y(0)=4.
November 18, 2013

Calculus
Determine whether the sequence is divergent or convergent. If it is convergent, evaluate its limit. A (sub n)=((4n-7)/(4n+9))
November 16, 2013

Calculus
Determine whether the sequence is divergent or convergent. a(sub n)=(−1)^n(sin(2/n))
November 16, 2013

Calculus
Solve the seperable differential equation 8yyŒ =x. Use the following initial condition: y(8)=4. Express x^2 in terms of y.
November 15, 2013

Calculus
Find the particular solution of the differential equation particular solution of the differential equation dy/dx=(x−7)e^(−2y).
November 15, 2013

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