# Posts by jane

Total # Posts: 1,649

**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

**science**

What may be some long-term effects of human interactions with the oceanic environments?

**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

**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 ...

**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 ...

**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?

**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.

**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?

**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.

**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

**math**

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

**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

**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?

**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.

**Alg 1**

Thanks you all so much!

**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

**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 ...

**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 ...

**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?

**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?

**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.

**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 ...

**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 ...

**Lit**

What works has become a classic expressions of the meaning of American democracy?

**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 ...

**Alg I**

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

**Chemistry**

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

**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

**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.

**math**

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

**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.

**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

**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

**billing and insurance**

I need to know what the cpt code is for a bilateral iliac arteriogram

**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 ...

**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??

**chemistry**

i'm sorry the equation is 2A + 3B +C<--->2D +3E

**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...

**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

**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?

**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?

**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 ...

**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

**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.

**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 ...

**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?

**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.

**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.

**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

**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

**physics**

200

**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 ...

**Precalc**

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

**Precalc**

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

**Precalc**

Convert the complex number c=3cis 0.25 into rectangular form.

**Precalc**

Write the complex number z = −6 in polar form

**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.

**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?

**Statistics**

2/2.5 = 0.8 z=0.7881 1-0.7881 = 0.2119

**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.

**Statistics**

-2 z=0.0228 1-0.0228 answer 0.9772

**Statistics**

54.5-50/50 = 4.5/5 = 0.9 z= 0.1841

**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

**English**

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

**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

**physics**

An object is dropped from ret from a height of 39.4m. What is its average acceleration (assumed to be constant) if it hits the ground with a speed of 1.61m/s? My quesion is, is a not 9.8 since gravity is acting on the object.

**science**

"Reproductive cells and somatic cells are not separated early in development, as they are in animals。 Instead, plant somatic cells that have undergone many rounds of mitosis can undergo meiosis and produce gametes." This is said in my notes under properties of...

**math**

mark recently completed a math course in which he took three tests. his scores were 80,75,85 each time out of 100 points. What score represents marks total achievement in the course?

**physics**

An airplane flies 200km due west from city A to city B and then 305km in the direction of 33.5 degrees north of west from city B to city C. a.) in straight-line distance, how far is city C from city A? b.) relative to city A,in what direction is city C? c.)Why is the answer ...

**physics**

A girl delivering newspapers covers her route by traveling 10.00 blocks west, 4.00 blocks north, and then 5.00 blocks east. a.) what is her resultant displacement? b.) what is the total distance she travels?

**physics**

a person walks 13.0 degrees north of east for 3.80km. How far due north and how far due east would she have to walk to arrive at the same location?

**math**

A bag contains ﬁfty slips (small pieces of paper) with the numbers 1, 2, . . . , 50 written on them (One number on each slip!). Your friend writes down ten numbers from 1, 2, . . . , 50 on a sheet of paper, and then you draw—without replacement—twenty slips ...

**Medical Terminology**

when comparing Hemodialysis and Peritoneal dialysis, it can be said that?

**Math: Algebra**

The points (5,2), (-10,-2), and (t,01) lie on the same line. Find the value of t. Please help me!

**Chem**

Rario z 1:2.mass ratio z 32 g:60 g.Therefore 64.69 g of li2o.

**the science of the mind (psychology)**

It's not C

**trigo**

the front wheel of a bicycle has a diameter of 16 in and the back wheel has a diameter of 26 in. through what angles does the front wheel turn if the rear wheel turns through 24 radians?

**Math**

is this right

**Math**

%68 0.9655 40 30

**Math**

? 3. the persents are 34/50

**Math**

3. In the small country of Varia, a bill becomes law only if of the senators approve it. What percentage is ? (1 point) 53% 58% 68% 88% 4. Write the percent 96.55% as a decimal. (1 point) 9655 965.5 0.9655 9.655 5. Liam wants to buy a bicycle that costs $290.00. His parents ...

**Math**

Jess is running around a circular track, one lap every 40 seconds. Mackenzie is also running at a constant speed around the same track, but in the opposite direction. They meet every 15 seconds. How many seconds does it take Mackenzie to do one lap?

**Math**

Oh i see now! Ok thank you!

**Math**

So what exactly would the answer be? im confused..

**Math**

Peter has 1200 yards of fencing to enclose a rectangular area. Find the dimensions of the rectangle that maximize the enclosed area?

**university physics**

come on guys,it's urgent

**university physics**

A cryogenic storage container holds liquid helium, which boils at 4.20 K. Suppose a student painted the outer shell of the container black, turning it into a pseudo-blackbody, and that the shell has an effective area of 0.615 m2 and is at 3.01·102 K. a) Determine the ...

**university physics**

A copper sheet of thickness 2.19 mm is bonded to a steel sheet of thickness 1.13 mm. The outside surface of the copper sheet is held at a temperature of 100.0°C and the steel sheet at 25.7°C. a) Determine the temperature (in °C) of the copper-steel interface. b) ...

**Biology**

Hemoglobin is physiologically designed to deliver more Oxygen to exercising tissues than to resting tissues. Discuss three pieces of evidence that support this argument.

**Astronomy**

What is the size of the smallest craater on the moon that you can see with a telescope with a resolution of 2 arc seconds at a distance of 384,400 km?away

**Astronomy**

What is the maximum altitude above the horizon at which it is possible to find the moon when you are observing from a position at 42 degrees northern latitude?

**Astronomy**

What is the radius of the sun?

**math**

There were 20% more boys than girls in a swimming club. After 50 girls left, there were twice as many boys as girls in the club. How many boys were there in the club?

**math**

The ratio of the number of girls to the number of boys in a stamp club was 3 : 2 last year. When 15 boys joined the club this year, the ratio became 2 : 3. Find the total number of children in the club this year.

**math**

There were 20% more boys than girls in a swimming club. After 50 girls left, there were twice as many boys as girls in the club. How many boys were there in the club?

**Math**

a bout travels 1km upstream and 1 km downstream.it took the boat 1 hour for the round trip. the speed of the current is 2 kph. find the speed of the boat in still water.

**math**

what abot if it was 34/50

**poetry**

thanks so is this a free verse

**poetry**

this is how i put it in my own words Each month passed us by we were in endless winter every day was cold as ever and night so harsh an cruel we wait for the return of the glorious wonder,the sun

**poetry**

this is the first saanzer of Scott Goodbye we saw the months of wicked weather, As day to painful night did turn, Waiting, huddled close together For the frozen sun’s return.