Wednesday

May 4, 2016
Total # Posts: 1,487

**Please help**

what is the sum of arithmetic series 2+5+8+...+260?
*May 3, 2016*

**my brother is not learning**

My mom also tried a lot.
*May 3, 2016*

**my brother is not learning**

I have a brother who is 5 years old, he is going to UKG. I managed to teach him the alphabet and numbers, but I'm struggling to teach him letter sounds. He is obsessed with TV he will not come to study. I am a middle schooler by the way.
*May 3, 2016*

**calculus**

rewrite each summation using the sigma notation. Do not evaluate the sums (a)3 + 4 + 5 + . . . + 93 + 94 (b)9 + 16 + 25 + 36 + . . . + 14
*May 2, 2016*

**calculus**

You own a small airplane that holds a maximum of 20 passengers. It costs you $100 per flight from St. Thomas to St. Croix for gas and wages plus an additional $6 per passenger for the extra gas required by the extra weight. The charge per passenger is $30 each if 10 people ...
*May 2, 2016*

**calculus**

Find the dimensions of the rectangle with the largest area if the base must be on the x-axis and its other two corners are on the graph of: (a) y=16-x²,-4<=x<=4 (b)x²+y²=1 (c)|x|+|y|=1 (d)y=cos(x),-pi/2<=x<=pi/2
*May 2, 2016*

**calculus**

Evaluate lim (1³ +2³ +3³ +…+ n3)/n^4 n →∞ by showing that the limit is a particular definite integral and evaluating that definite integral.
*May 2, 2016*

**calculus**

Evaluate π ∫ tan² x/3 dx 0
*May 2, 2016*

**calculus**

Use the Fundamental Theorem of Calculus to find G'(x) if: G(x)=∫ up(x²) bottom(1) cost dt
*May 2, 2016*

**calculus**

Use the Fundamental Theorem of Calculus to find G'(x) if: /x² G(x)= / cos t dt / 1
*May 2, 2016*

**calculus**

I'm having trouble on this question: Find the area of the region in the first quadrant that is bounded above by the curve y= sq rt x and below by the x-axis and the line y=x -2.
*May 2, 2016*

**Maths Urgent please**

Thanks
*April 25, 2016*

**Maths Urgent please**

i have no clue
*April 25, 2016*

**Probability**

jeff has 8 red marbles, 6 blue marbles, and 4 green marbles that are the same size and shape. he puts the marbles into a bag, mixes the marbles, and randomly picks one marble. what is the probability that the marble will be blue?
*April 24, 2016*

**calculus**

Find the maximum value of the function f(x)=(x^2+9x-3) / x^2
*April 24, 2016*

**calculus**

Find the critical numbers for the function f(x) = 2x / sqrt(x-1)
*April 24, 2016*

**Urgent help Maths Ms sue**

Use binomial series to find the Taylor series about 0 for the function f(x)=(1+x)^-3/5 giving all terms up to the one in x^4. Then use this series and Taylor series for sin x to find the quartic Taylor polynomial about 0 for the function f(x)= sinx/(1+x)^3/5
*April 24, 2016*

**Meteorology**

It occurs more frequently in warmer temperatures because of the speed in warmer liquids' molecules is fast enough for there to be many chances to get away or 'escape'. I am not sure if that made sense to you, but evaporation occurs more in warmer temperatures.
*April 19, 2016*

**Life orientation**

How can I help? Do you need information about this topic?
*April 19, 2016*

**Spanish**

1. (wrong) the answer is - A - 2. correct 3. correct
*April 18, 2016*

**calculus**

Find f'x given f(x)= 1/(1+(1/(1+(1/x))))
*April 18, 2016*

**math calculus**

Find the intervals on which the function f(x)=x²/³(10-x) is increasing and decreasing. Sketch the graph of y=f(x)and identify any local maxima and minima. Any global extrema should also be identified.
*April 18, 2016*

**Math/algebra**

Please reply if my answer has helped you.
*April 18, 2016*

**Math/algebra**

I am not sure, but this may help 1. Simplify 60 + -25x = 35x + 20 2. You change the order of the terms at this stag: 60 + -25x = 20 + 35x 3. Solving for variable x. Move the terms containing x to the left side, and the other terms to the right side. 4. Add -35x to both sides ...
*April 18, 2016*

**Language**

That Helped
*April 18, 2016*

**dramatic art .tourism. history and math lit**

Please post your question in more detail, what can we help you find information about?
*April 17, 2016*

**physics**

before 1900 the activity per mass of atmospheric carbon due to the presence of carbon-14 averaged about 0.255bq/g of carbon 1. what fraction of carbon is carbon-14
*April 17, 2016*

**physics**

before 1900 the activity per mass of atmospheric carbon due to the presence of carbon-14 averaged about 0.255bq/g of carbon 1. what fraction of carbon is carbon-14
*April 16, 2016*

**chem**

thanks Drbob222
*April 13, 2016*

**chem**

A sample of hexane was cracked. A sample of 50cm³ of gas was produced. The gas decolorized 4cm³ of 0.23moldm–³ solution of bromine. What % of alkenes was produced?
*April 13, 2016*

**chem**

alkene not alien
*April 13, 2016*

**chem**

A sample of hexane was cracked. A sample of 50cm³ of gas was produced. The gas decolorized 4cm³ of 0.23moldm–³ solution of bromine. What % of aliens was produced?
*April 13, 2016*

**chemistry**

I saw the solution as ..E for 1 molecule is 243kj/mol / 6.022E23 molecules. I don't seem to understand that part.
*April 13, 2016*

**chemistry**

calculate the lowest frequency of UV. light which has enough energy to break a Cl-Cl bond. ( bond energy =243kj/mol). I got 7.89E14 but the answer is 6.14E14s–¹. how?
*April 13, 2016*

**volume**

what is volume, if base area 56 in2, height 6 in
*April 12, 2016*

**Maths Ms sue **

A library opens with a collection of 300 books. During the first week after the opening, an additional ten books are donated to the library’s collection. In each subsequent week, six more books are donated to the library’s collection than were donated in the previous...
*April 12, 2016*

**chemistry**

magnessium chloride can be used to distinguish between cabonate and hydrogencarbonate ions. Describe how this is done with experimental observations
*April 11, 2016*

**chemistry**

magnessium chloride can be used to distinquish between cabonate and hydrogencarbonate ions. Descrbe how this done with experimental observations
*April 11, 2016*

**Math**

For this problem (2)^0 (-2)^0 do I add the exponents? If so then what Would I do with 2 and negative 2
*April 9, 2016*

**Math**

For this problem it says to explain why an equilateral scalene triangle is impossible to draw. Would it be because not all three sides will be equal?
*April 9, 2016*

**physics **

Periodic waves spread out over the surface of a lake where two women, Jenny and Melissa, are fishing in separate boats 65 meters apart. Each woman's boat bobs up and down 19/min. At a time when Jenny's boat is at a crest, Melissa's boat is at its lowest point, and ...
*April 8, 2016*

**physics **

Two tuning forks are sounded together. One has a frequency of 741 Hz and the other a frequency of 715 Hz. Calculate the beat frequency that would be produced.
*April 8, 2016*

**physics **

A 3580 Hz tuning fork is sounded at the same time that a note on a piano is struck. You hear 8 beats/s. You loosen the string slightly and now hear 12 beats/s. What is the frequency of the vibrating piano string now after the loosen ing?
*April 8, 2016*

**physics **

How much will it cost you (in cents) to operate a 29 Ω electric skillet on a standard 120 V outlet for 5 hours and 36 minutes? The unit price for electrical energy in this case is 7.350 cents/kWh.
*April 8, 2016*

**physics **

1. A typical household circuit is capable of carrying 15.0 Amps of current at 120 V before the circuit breaker will trip. How many 1500-W hair dryers can run off one such circuit? In the rush to get ready for lecture, a physics professor leaves the hair dryer described in the ...
*April 8, 2016*

**chemistry**

A mixture of 0.2 moles of alcohol A and 0.5 moles of alcohol B has a total vapour pressure of 40 mmHg at 297 K. If the mixture obeys Raoult's law, find the vapour pressure of pure B at 297 K given that the pressure of a pure A is 20 mmHg at 297 K.
*April 5, 2016*

**Math**

what is the distance between points A and E? A is located at (3,4) and E is located at -1 on the x-axis answers: a. 2.8 b. 3.2 c. 4.9 d. 5.7 is the answer A?
*April 1, 2016*

**chemistry**

please how do I solve it?
*April 1, 2016*

**chemistry**

A certain elementary gas is triatomic and has vapour density 48 . The atomic mass of the gas is (a) 48 (b) 96 (c) 32 (d) 16 ..
*April 1, 2016*

**physics**

A radioactive source of a single nuclide emits 2.4-MeV neutrons at the rate of 9200 neutrons per second. The number of atoms in the source is 4.0 ×109. The activity of the source, in nCi, is
*March 31, 2016*

**physics**

A radioactive source of a single nuclide emits 2.4-MeV neutrons at the rate of 9200 neutrons per second. The number of atoms in the source is 4.0 ×109. The activity of the source, in nCi, is
*March 30, 2016*

**nuclear physics**

how do I solve it?
*March 30, 2016*

**nuclear physics**

Neptunium 239 93 Np has a decay constant of 3.40 ×10-6 s-1. A 3.0-mg sample of Np-239 is prepared. The activity of the Np-239 sample, in Ci, is
*March 30, 2016*

**physics**

Neptunium 239 93 Np has a decay constant of 3.40 ×10-6 s-1. A 3.0-mg sample of Np-239 is prepared. The activity of the Np-239 sample, in Ci, is
*March 30, 2016*

**physics**

A proton is projected at a stationary 6238 Ni aluminum target. The proton momentarily comes to a halt at a distance from the center of an aluminum nucleus, equal to twice the nuclear radius. Assume that the nucleus retains its spherical shape and that the nuclear force on the ...
*March 30, 2016*

**physics**

the nuclei Co-57 an odd-even unstable nucleus is often used as a source of radiation in nuclear processes. Show that the nuclei is stable relative to beta plus decay by electron capture
*March 30, 2016*

**Maths**

A large school in the UK offers its pupils the opportunity to learn several non-English languages. It turns out that: • 55% of pupils in this school choose to learn French; • of the pupils who learn French, 40% also learn German. (c) Additional information is now ...
*March 30, 2016*

**Hypothesis Testing - maths**

Data were collected on the differences in weight gains of 12 people one month after they stopped smoking, compared with their weight at the time when they stopped smoking. The data are given in Table 2. A positive quantity corresponds to a gain in weight, a negative quantity ...
*March 29, 2016*

**Maths - Statistics**

A large school in the UK offers its pupils the opportunity to learn several non-English languages. It turns out that: • 55% of pupils in this school choose to learn French; • of the pupils who learn French, 40% also learn German. (a) For pupils in this school, let F ...
*March 29, 2016*

**Math**

Marcus has a large supply of rectangular wooden tiles. He wants to lay them out to form a square such that there are no gaps, and no tiles overlap. Each tile measures 44 mm wide and 56 mm long a) What will be the dimensions of the smallest square he can form using these tiles...
*March 29, 2016*

**Math **

An auditorium has 150 rows of seats. The first row has 15 seats, the second row has 17 seats, the third row has 19 seats, and so on, each row having two more seats than the previous row. How many seats are there together in the auditorium.
*March 29, 2016*

**precal**

If = 38° and y = 42 cm, what is the value of z to the nearest tenth of a centimeter?
*March 26, 2016*

**physics**

thanks a lot Damon
*March 26, 2016*

**physics**

A force of 80N acts on a body initially at rest and moves 72m in 6s. If the force is removed after 6s calculate how far the body moves after 6s
*March 26, 2016*

**physics**

a handbag weighing 162N is carried by the students each holding the handle of the bag next to him. If each handle is inclined at 60° to the vertical, find the force on each students arm
*March 26, 2016*

**math !**

She asked not have the answers why did u give it to her
*March 23, 2016*

**MATH**

Ginger has 12 plastic bead containers. The containers measure 1 inch on each side. How many rectangular prisms, each with a different-sized base, could Ginger make by stacking all of the bead containers?
*March 23, 2016*

**U.S. History**

I have to do a slide presentation, and just needed some ideas to write about. Students will create a 3-slide presentation on any development in culture, science, and technology from 1914-1945, in America. So can you give me some ideas to write about?
*March 16, 2016*

**Calculus**

The City Electric System(CES) recently constructed a major transmission line along parts of South Street in the city. The transmission lines are strung between power poles and the hanging lines form a catenary curve. For this Problem we will use the following equation y=(T/w)...
*March 7, 2016*

**math**

It takes a hose 4 minutes to fill a rectangular aquarium 8 inches long, 9 inches wide, and 10 inches tall. How long will it take the same hose to fill an aquarium measuring 22 inches by 26 inches by 34 inches?
*March 2, 2016*

**Physics**

A certain spring stretches 6 cm when a load of 30 N is suspended from it. How much will the spring stretch if 50 N is suspended from it (and it doesn't rsach its elastic limit)? I don't understand what to do for this problem.
*February 27, 2016*

**Physics**

A 50-kiligram block initially at rest on a flat, level and smooth surface is pulled by 6.0 Newton acting 37 degrees North above the horizontal. Find the normal force and acceleration of the block.
*February 23, 2016*

**math**

Find the variation constant and an equation of variation if y varies directly as x and the following conditions apply.
*February 21, 2016*

**physics**

I'm sorry its 4m to the positive xaxis from point A. I started by calculating the electric potential and potential energy at point P.. but I don't know which distance to use in solving for the workdone. is it the distance from A or B or both.
*February 20, 2016*

**physics**

what is the work done a bringing a charge from infinity to a point P, if the point P is 5m to the positive y-axis from a charge A(5uC) which is 3m to the left of another charge B(-2uC)?
*February 20, 2016*

**Calc**

Simplify Sq. rt of 5 +4t^2
*February 17, 2016*

**MATH 4 GRADE**

(3/4 + 3/4) = 1.5 miles. 3 miles / 1.5 miles = 2 days
*February 17, 2016*

**Physics **

Suppose a chinook salmon needs to jump a waterfall that is 1.32 m high. (a) If the fish starts from a distance 1.24 m from the base of the ledge over which the waterfall flows, find the x- and y-components of the initial velocity the salmon would need to just reach the ledge ...
*February 17, 2016*

**Math **

Seven and one half percent is equivalent to the decimal number 0.075. If the sales tax rate is 7.50 what is the sales tax on a $10.00 purchase?
*February 17, 2016*

**Java Programming**

I am trying to finish this final problem on my Java homework. Due to a death in the family I've missed a class and now am trying to get back on track. Write a driver class called GasPumpDriver that meets the following specifications: • Prompt the user to enter a 16 ...
*February 14, 2016*

**chemistry**

Determine how much heat (in kilojoules) is evolved or absorbed in the reaction of 1.05 g of Na with H2O: 2Na(s)+2H2O(l) →2NaOH(aq)+H2(g),ΔH∘=−368.4 kJ
*February 11, 2016*

**Math**

Three equivalent ratios for 1 2/3: 5/4
*February 10, 2016*

**master chemistry**

The rate constant of a chemical equation has increased from 0.100s^-1 to 2.70s^-1 upon raising the temperature from 25C to 45C. Find the activation energy. So far I done 3.30=(Ea/8.314)(-2.11x10^-4)
*February 6, 2016*

**physics**

pls can u work it out? I don't understand how u got the answer.
*February 3, 2016*

**physics**

Two trucks A and B each travelling at 40 km/hr, move towards each other . At the instance when the two trucks are at a distance 50 km from one another, a car moving at 60 km/hr overtakes A. How far behind the car is A at the point when the car meets B?
*February 3, 2016*

**Geometry**

Find the point that is one-fourth of the way from (-3,1) to (11,9)
*February 2, 2016*

**calculus**

The demand for your hand-made skateboards, in weekly sales, is q = −4p + 600 if the selling price is $p. You are prepared to supply q = 6p − 400 per week at the price $p. What price should you sell your skateboards for so that there is neither a shortage nor a ...
*January 30, 2016*

**math**

A license plate in a particular state consists of 5 characters. The first 4 characters are made up using the digits 0-9, but the first character cannot be a zero. The remaining characters are letters. No characters can be repeated. How many different license plates are ...
*January 28, 2016*

**LA 1Question 2 parts**

ok thx!
*January 21, 2016*

**Math**

N= -1 x h + 24
*January 20, 2016*

**math **

perform this operation to the correct significant figure. 2.0cm × 0.01m in the correct significant figure. should the answer be in two or one significant figures
*January 19, 2016*

**physics**

an ideal gas occupies a volume of 22.4litres at stp while absorbing 2.53KJ of heat from the surrounding the gas expands isobarically to 32.4 litres. What is the change in internal energy
*January 19, 2016*

**Matg**

If a soft all team has 10 players, how many teams need to be formed for at least 68 players ?
*January 12, 2016*

**Algebra**

a flower garden has a length that is 4 feet shorter than twice it's width. The area of the garden is 96 square feet. What are the dimensions?
*December 16, 2015*

**physics**

determine the energy stored in a 2m long wire of cross sectional area 0.5mm^2 kf the force of 50N is applied to it.
*December 14, 2015*

**physics please urgently**

A body whose weight is W1=75N is tied to another body whose weight is W2=45N .If the coefficient of kinetic friction between W1 and the inclined plane (25°)AB is 0.15,calculate the coefficient of kinetic between W2 and the inclined plane(15°) BC when the two masses ...
*December 12, 2015*

**physics**

please its urgent
*December 12, 2015*

**physics**

W1 and W2 are connected by a rope that is passed through apulley.
*December 12, 2015*

**physics**

A body whose weight is W1=75N is tied to another body whose weight is W2=45N .If the coefficient of kinetic friction between W1 and the inclined plane (25°)AB is 0.15,calculate the coefficient of kinetic between W2 and the inclined plane(15°) BC when the two masses ...
*December 12, 2015*

**numerical analysis**

need a probability distribution to select a parking stall in a parking lot with 50 stalls
*December 10, 2015*