Monday

August 3, 2015

August 3, 2015

Total # Posts: 1,465

**Algebra 1**

Emily rows six miles downstream in 1 hour and her friend Ashley,rowing 1 mile per hour faster,completes the return trip in 2 hours. 1.Find the speed of the current(c) and each girls rowing speed. 2.If Emily and Ashley were rowing separately,who would complete their trip first ...
*May 7, 2013*

**statistics**

-.044
*May 6, 2013*

**Physics**

a magnetic rail gun is constucted to give a space vehicle its intial launch velocity, thereby reducing the amount of fuel the vehicle has to carry. it consist of two very long parallel rails across which is positioned a large current carrying crossbar 7.65 m long. The crossbar...
*May 4, 2013*

**Math**

Use Excel’s PMT function to calculate the monthly mortgage payment
*May 2, 2013*

**math**

Alyssa is enrolled in a public-speaking class. Each week she is required to give a speech of greater length than the speech she gave the week before. The table below show the length of several of her speeches: WK #/Length of Speech (seconds) 3/150, 4/180, 5/210, 6/240 If this ...
*April 29, 2013*

**Alg 1**

Diana is driving 182 miles to Orlando for a math convention. She has already driven x miles of th trip. If Diana drives below 70 miles per hour for the remainder of th trip, which inequality best represents the amount of time in hours, t, that is will take her to complete the ...
*April 29, 2013*

**algebra**

1=radical3-3p-2p
*April 29, 2013*

**physics**

what pressure (in atm) would be exerted by 76g of fluorine gas in a 1.5 litre vessel at -37 degrees Celsius?
*April 26, 2013*

**Algebra **

What is the maxima and minima of a parobola?
*April 22, 2013*

**Math**

Ms Perez owns 2 properties in different towns. The 1st property is assessed at $125,000 and has a tax rate of $6.35 per 1000 dollars. The 2nd property has the same assessed value, but is taxed at the rate of $0.00587 per dollar. Derive the solution to the total tax obligation ...
*April 19, 2013*

**Probability**

If 5 juniors and 4 seniors apply for a job at a school which has 2 openings, what is the probability that 1 junior and 1 senior will be randomly chosen for the job.
*April 19, 2013*

**Alg 1**

If y = 1, then (x + 5) times y = x + 5 Which property does it apply to? Cumutative Property of addition? My choices are: Inverse Property of Mult. Identity Property of Mult. Associative Property of addition Cummutative Property of addition.
*April 16, 2013*

**Alg 1**

Michael takes 90 min to type 5850 words. If he increases his typing speed by 5 words/min. How many minutes will he take to type 10,500 words? Is it 150 minutes?
*April 16, 2013*

**Alg 1**

It is copied correctly. My choices are: 6/5 sqrt11 + 6/5 5/6 sqrt11 + 6/5 6/5 sqrt11 - 6/5 5/6 sqrt11 - 6/5
*April 16, 2013*

**Alg 1**

Solve the proportion: 4/x = (radical sign over 11, not -1) 11 - 1/3 Please solve and explain. My answer does not match any of my choices.
*April 16, 2013*

**Alg 1**

Why multiply it by 200? My answer choices are: 18.07 ft 35.96 ft 9.04 ft 71.93 ft
*April 16, 2013*

**Alg 1**

Landon is standing in a hole that is 6.5 ft deep. He throws a rock and it goes up into the air, out of the hole, and then lands on the ground above. The path of the rock can be modeled by the equation y = -0.005x^2 + 0.45x - 6.5, where x is the horizontal distance of the rock...
*April 16, 2013*

**alg 1**

Thanks Steve, you are always so helpful. There was no error data. The only thing I did not type from the problem was: (The measurements are accurate to the nearest inch). This was typed over the answer choices.
*April 16, 2013*

**alg 1**

Find the percent error in calculating the volume of the prism. V=(bw)(h) v=11 x 8 (7) V=616 my choices were: 19% 10% 119% 83% I'm not sure what it means to find the percent error. Please explain. Thanks.
*April 16, 2013*

**Alg 1**

What are the approximate solutions of 2x^2 -x + 10 = 0 In working this, I came up with a negative (-79) under the radical sign. Can I take the sq rt of a negative? my choices are: -2, 2.5 -1.97, 2.47 -2.5, 2 No solution I think it is no solution. Is this correct? If not, ...
*April 15, 2013*

**Alg 1**

Reasoning: The equation 3x^2 + bx + 3 = 0 has one real solution. What must be true about b? I think it is: b must be the same as -4(a)(c). What are your thoughts?
*April 15, 2013*

**Alg 1**

The equation is: -w^2 +75w - 1200 the neg sign was so close to the = sign above. Sorry about that.
*April 15, 2013*

**Alg 1**

The quadratic formula and the discriminat. The daily production of a company is modeled by the function p=-w^2 + 75w - 1200. The daily production, p, is dependent on the number of workers w, present. If the break-even point is when p=0, what are the least and greatest number ...
*April 15, 2013*

**Alg 1**

A box shaped like a rectangular prism has a height of 17 in. and a volume of 2720 in^3. The length is 4 inches greater than twice the width. What is the width of the box? Please solve and explain what I need to do. The choices are: -10 8 20 40
*April 14, 2013*

**Alg 1**

The rectangular has an area of 5400 cm^2. What is the value of w? 5400 = (w)(2w - 30) 5400 = 2w^2 - 30 w 5400 = 2w(w - 15) Now I am stuck. My choices are: -45 cm 45 cm 60 cm 90 cm What do I need to do next to get the correct answer? Thanks.
*April 14, 2013*

**Alg 1**

Completing the square: Which of the following is a solution x^2 + 14x + 112 = 0? If necessary round to the nearest hundredth. x= -0.24 x= -4.24 x= 4.24 no solution I worked it and got neither of the answers. I got x= 0.9 and x=-14.9. Where did I go wrong? Thanks
*April 14, 2013*

**Alg 1**

Completing the square: Find the value of c such that each expression is a perfect-square trinomial. p^2 - 11p + c Is the answer 30.25? If not, please explain. Thanks
*April 13, 2013*

**Alg 1**

That two consecutive numbers that multiply and equal 42 is 6x7. 6 + 1+7
*April 13, 2013*

**Alg 1**

The product of two consecutive integers, n and n+1, is 42. What is the positive integer that satisfies the situation? Is it 6 x 7?
*April 13, 2013*

**Alg 1**

A triangular-shaped wall has a base of 2x+4 and a height of x+3. The area of the triangle is 56 in^2. What is the value of "x"?
*April 13, 2013*

**Al**

Factoring to solve quadratic equations: Find the value of x as it relates to the triangle. Area = 600 cm^2 There is a large triangle that is divided by a 90 degree angle in the middle. That 90 degree angle line is "x" and the complete bottom of the large triangle is...
*April 13, 2013*

**PHYSICS**

Bricks have a thickness of 12 cm, if an external wall of the house measures 10 mx 15m, calculate the rate of heat exchange through this wall if the inside temperature is 200C and the outside temperature is 50C.
*April 10, 2013*

**Alg 1**

Factoring to solve quadratic equations: Use the Zero-Product Property to solve each equation. Write your solution in roster form: The volume of a storage tub shaped like a rectangular prism is 24 ft^3. The height of the tub is 3 feet. The width is w feet and the length is w+...
*April 8, 2013*

**Alg 1**

The length of a rectangular prism is four times the width. The height of the prism is 8 ft. If the volume of the prism is 160 ft^3, what is the width of the prism? Round to the nearest tenth of a foot. Please solve and explain. Thanks
*April 6, 2013*

**Alg 1**

Solving quadratic equations: What is the value of "b" in the triangle where one part of the right angle is "3b" and the other part of the right angle is "b". The area inside is 24 in^2. Please solve and explain. Thanks
*April 6, 2013*

**Alg 1**

Solving quadratic equations: What is the radius of the largest circular quilt that can be made with an area less than or equal to 70 ft^2? Round your answer to the nearest tenth of a foot if necessary. Please solve and explain. Thanks
*April 6, 2013*

**science**

What may be some long-term effects of human interactions with the oceanic environments?
*April 5, 2013*

**math**

The square yard you are mowing has an area of 9600 ft^2. What is the side length of the yard? Round your answer to the nearest tenth of a foot if necessary. Please solve and explain
*April 5, 2013*

**Chem HW!! Difficult! HELP!**

Urea (H2NCONH2) is used extensively as a nitrogen source in fertilizers. It is produced commercially from the reaction of ammonia and carbon dioxide. 2 NH3(g) + CO2(g) ---Heat pressure---> H2NCONH2(s) + H2O(g) Ammonia gas at 223°C and 90. atm flows into a reactor at a ...
*April 5, 2013*

**Alg 1**

A baseball player hit a ball with an upward velocity of 46 ft/s. Its height h is feet after t seconds is given by the function h = -16t^2 + 46t + 6. What is the maximum height the ball reaches? How long will it take the baseball to reach the maximum height? How long does it ...
*April 4, 2013*

**alg 1**

Quadratic graphs and their properties: Identify the domain and range of each function: y = 4x^2 - 3 I have no idea how to find the range and domain. Would you please explain in detail how I can determine the domain and range in the quadratic problems?
*April 4, 2013*

**STAT**

A population has a standard deviation ó of 23 units. (Give your answers correct to two decimal places.) (a) Find the standard error for the mean if n = 11. (b) Find the standard error for the mean if n = 41. (c) Find the standard error for the mean if n = 85.
*April 3, 2013*

**math**

A diagram shows the design of the 12 in quilt (12" x 12") block that a quilter is sewing. What are the dimensions of each triangle in the quilt block? What are the dimensions of each triangle to the nearest tenth of an inch?
*April 3, 2013*

**Alg 1**

A golden rectangle is 32 cm long. The ratio of length to width is (1 + sq rt 5)/2. What is the width of the rectangle in simplest radical form? Please solve and explain. Thanks.
*April 3, 2013*

**Alg 1**

Find the exact solution for each equaton. Find the approximate solution to the nearest tenth. 3 sq rt 3/sq rt 1 + sq rt 1 = x/sq rt 3 Please solve and explain. Thanks
*April 3, 2013*

**math**

Operations with radical expressions: Simplify each quotient. -3/sq rt 2 + sq rt 5
*April 3, 2013*

**Alg 1**

Find the exact solution for each equation. Find the approximate solution to the nearest tenth. 5 sq rt 2/ sq rt 2 -1 = x / sq rt 2 Please explain in detail how to work this. I am really confused. Thanks
*April 3, 2013*

**Alg 1**

Operations with radical expressions: Simplify each quotient 7/sq rt 2 - sq rt 3 Please solve and explain how you did it. What do you do when the denominator is a negative?
*April 3, 2013*

**Alg 1**

An area rug is shaped like a golden rectangle. Its length is 8 ft. What is the rug's width? Write your answer in simplified radical form and rounded to the nearest tenth of a foot. Please explain how to work this. Thanks.
*April 2, 2013*

**Alg 1**

Thanks you all so much!
*April 2, 2013*

**Alg 1**

Would you please show me how you arrived at the answer "D." I don't know how to set up the problem to get the answer. Thanks
*April 2, 2013*

**Alg 1**

Simplifying Radicals A gardener is mowing a 20-yd-by-40 yd rectangular pasture using a diagonal pattern. He mows from one corner of the pasture to the cxorner diagonally opposite. What is the length of this pass with the mower? Give your answer in simplified form. My answer ...
*April 2, 2013*

**math**

A gardener is mowing a 20 yard-by-40 yd rectangular pasture using a diagonal pattern. He mows from one corner of the pasture to the corner diagonally opposite. What is the length of this pass with the mower? Give your answer in simplified form. Please explain to me how to ...
*April 2, 2013*

**math**

A walking path is shaped like a rectangle with a width 7 times its length "l". What is a simplified expression for the distance between opposite corners of the walking path?
*April 2, 2013*

**math**

A carpenter is building rectangular walls for a room addition. The width of a section of wall is two times the height h. Each section has a brace that connects two opposite corners of the section. What is a simplified expression for the length of a brace?
*April 2, 2013*

**Math**

Pythagorean Theorem A rectanglar box is 9 in. wide, 11 in. tall, and 20 in. long. What is the diameter of the smallest circular opening through which the box will fit? If necessary, round to the nearest tenth of a centimeter.
*April 1, 2013*

**Social Studies**

PLEASE EXPLAIN IN YOUR OWN WORDS PLEASE PLEASE HELP IN YOUR OWN WORDS PLEASE. :( :( 1) Explain the similarities and differences between corporate farms and mixed-crop farms. 2) Identify two problems resulting from urban sprawl in the western region of the United States. If ...
*March 28, 2013*

**chemistry**

Phosphoric acid is a triprotic acid with the following pKa values: pKa1=2.148 pKa2=7.198 pKa3=12.375 You wish to prepare 1.000 L of a 0.0200 M phosphate buffer at pH 7.11. To do this, you choose to use mix the two salt forms involved in the second ionization, NaH2PO4 and ...
*March 28, 2013*

**Lit**

What works has become a classic expressions of the meaning of American democracy?
*March 28, 2013*

**chemistry**

Carbon dioxide dissolves in water to form carbonic acid, which is primarily dissolved CO2. Dissolved CO2 satisfies the equilibrium equation: CO2(g)<==> CO2 (aq) K=0.032 The acid dissociation constants listed in most standard reference texts for carbonic acid actually ...
*March 27, 2013*

**Alg I**

Find a pair of factors for each number by using the difference of two squares. 84 55 80 Please explain. Thanks
*March 27, 2013*

**Chemistry**

balance Single replacement reactions and name of the products. 1. Zn+Cu3(PO4)2= 2. Na+F2O3= 3. Li+HNO3=
*March 27, 2013*

**math**

A parallelogram has an area of 8x^2 - 2x -45. The height of the parallelogram is 4x + 9. I know the formula for a parallelogram is A=bh. Please work and explain how I get the length of the base of the parallelogram. Thanks
*March 27, 2013*

**Alg I**

12r^2 + ____ + 6 How do I solve this ax^2 + bx + c problem. Please explain in detail. I simply do not get it. Thanks.
*March 27, 2013*

**math**

In factoring ax^2 + bx + c, what are the steps in finding the unknown "b"?
*March 26, 2013*

**Alg I**

Factoring ax^2 + bx + c Find two different values that complete each expression so that the trinomial can be factored into the product of two binomials. Factor your trimonials. 4n^2+ __n - 3 Please explain and solve.
*March 25, 2013*

**chemistry**

calculate the mass in grams of hydrogen chloride produced when 5.25 L of a molecular hydrogen measured at STP reacts with an excess of molecular chlorine gas
*March 24, 2013*

**chemistry**

If 3.12 kg of S are reacted with oxygen calculate the volume of SO2 gas in mL formed at 35 degrees Celsius and 1.09 atm
*March 24, 2013*

**billing and insurance**

I need to know what the cpt code is for a bilateral iliac arteriogram
*March 19, 2013*

**chemistry**

One step in the isolation of pure rhodium metal (Rh) is the precipitation of rhodium(III) hydroxide from a solution containing rhodium(III) sulfate According to the following balanced chemical equation: Rh2(SO4)3(aq)+ 6NaOH(aq)→ 2Rh(OH)3(s)+ 3Na2SO4(aq) What is the ...
*March 14, 2013*

**chemistry**

For the reaction 2A(g) + B(aq) + 3C(l)<------> D(s) + 3E(g), the concentrations at equilibrium are found to be: A: 2.3x10^3 Pa B: 1.8x10^-2 M C: 15.8M D: 12.5M E: 5.6x10^4 Torr i got an answer of 1.83x10^-13 is this correct??
*March 14, 2013*

**chemistry**

i'm sorry the equation is 2A + 3B +C<--->2D +3E
*March 13, 2013*

**chemistry**

the concentrations and pressures at equilibrium were found to be: 1.6 × 10–2 M for A, 8.1 × 103 Pa for B, 13.6 M for C, 13.1 M for D, and 3.9 × 104 Torr for E. Calculate the equilibrium constant, K the right answer is 1x10^12 i tried this problem so many...
*March 13, 2013*

**Algebra**

Would you please show me how you arrived at that answer. I do not know how to set up the problem to get the answer. Thanks
*March 13, 2013*

**math**

A telephone pole is 55 feet tall. Jeri stands in the shadow of the pole. She is 66 inches tall, gut her shadow is 12 feet long. How far away from the telephone pole is she standing?
*March 6, 2013*

**math**

A circular pool has a diameter of 12 feet. The pool is 5 feet deep everywhere. How much water is needed to fill the pool?
*March 6, 2013*

**math**

A community center is expanding the size of its rectangular meeting hall. The hall is currently 300ft long and 150ft wide. The center plans to expand both the length and the width of the meeting hall by 3x ft. What polynomial in standard form represents the area of the ...
*March 4, 2013*

**math**

The radius of a cylinder is 3x-2 cm. The height of the cylinder is x+3 cm. What is the surface area of the cylinder? The choices are: 2pi(3x^2 + 10x - 8) 2pi(12x^2 + 7x - 2) 2pi(12x^2 - 2x + 13) 2pi(12x^2 - 5x - 2) Please help me in setting this up and solving. Thanks
*March 4, 2013*

**physics**

the coefficient of friction between a block of weight 15N and a horizontal board on which it is resting is 3.0find the horizontal force which will just remove the block and the force acting at an angle of 30 with the horizontal which will just move the block.
*March 1, 2013*

**math**

A rectanglar blacktop with a length of 5x and a width of 3x has been erected inside a rectangular field that has a length of 12x and a width of 7x. What is the area of the part of the field that is not blacktop? (I believe the answer is 69x^2) There is a circular fountain in ...
*March 1, 2013*

**math**

There is a circular garden in the middle of a square yard. The radius of the circle is 4x. The side length of the yard is 20x. What is the area of the part of the yard that is not covered by the circle?
*March 1, 2013*

**Math (2nd Try)**

A rectangle has a length of 6x^3 y^2 - 1 and a width of 3xy + 2. The formula for the perimeter of a rectangle is P=2l + 2w, where l is the length and w is the width. What is the perimeter of the rectangle? Simplify your answer.
*March 1, 2013*

**Alg. I**

A rectangle has a length of 6x^3 y^2 - 1 and a width of 3xy + 2. The formula for the perimeter of a rectangle is P=2l + 2w, where l is the length and w is the width. What is the perimeter of the rectangle? Simplify your answer.
*February 28, 2013*

**Alg. I**

(-5d^-5) (6d^2) -30d^-3 I know that d^-3 goes on the bottom to make it positive;however,does -30 go on the bottom as well? Please explain the rule(s) for this. Thanks
*February 26, 2013*

**physics**

A proton (mass m = 1.67 10-27 kg) is being accelerated along a straight line at 2.1 1015 m/s2 in a machine. The proton has an initial speed of 2.4 107 m/s and travels 4.2 cm. (a) What is its speed? 1 . m/s (b) What is the increase in its kinetic energy? 2 . J
*February 25, 2013*

**Thermodynamics**

A cylinder contains one liter of air at room temperature (300 K) and atmospheric pressure (10^5 N/m^2). At one end of the cylinder is a massless piston, whose surface area is 0.01 m^2. Suppose that you push the piston in very suddenly, exerting a force of 2000 N. The piston ...
*February 23, 2013*

**Precalc**

The vectors, (2, -1) and (4, 8), are 1)parallel 2)perpendicular 3)neither parallel or perpendicular
*February 23, 2013*

**Precalc**

Write the complex number z = 2 + 5i in polar form, rounding to the nearest hundredth if needed.
*February 23, 2013*

**Precalc **

Convert the complex number c=3cis 0.25 into rectangular form.
*February 23, 2013*

**Precalc **

Write the complex number z = −6 in polar form
*February 23, 2013*

**Algebra I**

The cost of 4 scarves and 6 hats is $52. The cost of two hats is $1 more than the cost of one scarf. What are the costs of one scarf and one hat? Please show me how to set this up and work it.
*February 21, 2013*

**Physics**

the energy that can extracted from a storage battery is always less than the energy that goes into it while it is being charged. why?
*February 18, 2013*

**Statistics**

2/2.5 = 0.8 z=0.7881 1-0.7881 = 0.2119
*February 10, 2013*

**Statistics**

The lengths of pregnancies are normally distributed with a mean of 273 days and a standard deviation of 20 days. If 64 women are randomly selected, find the probability that they have a mean pregnancy between 273 days and 275 days.
*February 10, 2013*

**Statistics**

-2 z=0.0228 1-0.0228 answer 0.9772
*February 10, 2013*

**Statistics**

54.5-50/50 = 4.5/5 = 0.9 z= 0.1841
*February 10, 2013*

**Science (8th grade)**

You just forgot to include the decimals :) a snail dosen't go over 4000 mph! Use common sense before turning these things in. Once said a turtle went 50 mph on a test,,, silly me
*February 9, 2013*

**English**

Yes, though using "cannot" instead of "can't" eliminates the awkward double contraction
*February 9, 2013*

**Science**

A stretched spring with k=21.6 N/m is pulling with a force of 1.5 N. How much work was done to stretch the spring
*February 6, 2013*