# Posts by Rachel

Total # Posts: 1,634

1. ### Math

Thanks so much. Mrs.Sue what school do you teach and what grade?
2. ### Math

Can someone help me on how to do this without a calculator. It would really help me out thanks The problem is below An item on sale costs 65% of the original price. The original price was \$15 .
3. ### Math

hello how are you
4. ### chem

Based on the ratio of mean moles of O2/mol KClO3 what is the chemical equation for the reaction that occurred? Why? Is this conclusion in accord with the mass of the solid product that you obtained? Explain
5. ### Math

Sales of a video game released in the year 2000 took off at first, but then steadily slowed as time moved on. The table below shows the number of games sold, in thousands, from the years 2000–2010. Year 2000 2001 2002 2003 2004 2005 Number Sold (thousands) 142 149 154 155...
6. ### Math

Thank you Steve :)
7. ### Math

Determine the expotential growth equation from the following table? Year 2007: 1.6 million subscribers Year 2008: 2.7 Year 2009: 4.4 Year 2010: 6.4 Year 2011: 8.9 Year 2012: 13.1 Year 2013: 19.3 Year 2014: 28.2 Year 2015: 38.2 Year 2016: 48.7 A. What is the expotential ...
8. ### chem

A researcher studying the nutritional value of a new candy places a 3.50-gram sample of the candy inside a bomb calorimeter and combusts it in excess oxygen. The observed temperature increase is 2.23 °C. If the heat capacity of the calorimeter is 31.30 kJ·K–1, ...
9. ### chem

If the heat of combustion for a specific compound is -1160.0 kJ/mol and its molar mass is 90.75 g/mol, how many grams of this compound must you burn to release 823.00 kJ of heat?
10. ### fine art research paper help please

Hm, I see that you are the one who likes to complicate the things. Why don't you solve the issue faster? Turn to the writing company students use. Primewritings is providing all parts of the writing papers for the students at online. It is having good and effective set of ...
11. ### chem

A 8.00-L container holds a mixture of two gases at 23 °C. The partial pressures of gas A and gas B, respectively, are 0.349 atm and 0.819 atm. If 0.210 mol of a third gas is added with no change in volume or temperature, what will the total pressure become?
12. ### chem

1.45 g of an unknown gas at 53 °C and 1.10 atm is stored in a 1.85-L flask. What is the density of the gas what is the molar mass of the gas
13. ### Chem

How many molecules are there in an ideal gas with a volume of 1.99 L at STP?
14. ### Chem

If 2.41 moles of an ideal gas has a pressure of 4.65 atm, and a volume of 27.33 L, what is the temperature of the sample in degrees Celsius?
15. ### chem

would I do 4.03*51.80
16. ### chem

If 63.5 moles of an ideal gas is at 4.03 atm at 51.80 °C, what is the volume of the gas?
17. ### Chem

If 86.5 mol of an ideal gas occupies 13.5 L at 79.00 °C, what is the pressure of the gas?
18. ### Chem

A sealed container holding 0.0255 L of an ideal gas at 0.989 atm and 71 °C is placed into a refrigerator and cooled to 45 °C with no change in volume. Calculate the final pressure of the gas.
19. ### chem

A flexible container at an initial volume of 4.11 L contains 7.51 mol of gas. More gas is then added to the container until it reaches a final volume of 15.9 L. Assuming the pressure and temperature of the gas remain constant, calculate the number of moles of gas added to the ...
20. ### Chem

A sample of an ideal gas has a volume of 3.20 L at 14.80 °C and 1.50 atm. What is the volume of the gas at 21.80 °C and 0.989 atm?
21. ### Chem

A balloon is inflated to a volume of 7.0 L on a day when the atmospheric pressure is 765 mmHg. The next day, as a storm front arrives, the atmospheric pressure drops to 725 mmHg. Assuming the temperature remains constant, what is the new volume of the balloon, in liters?
22. ### chem

A hot air balloon is filled with 1.51 × 106 L of an ideal gas on a cool morning (11 °C). The air is heated to 103 °C. What is the volume of the air in the balloon after it is heated? Assume that none of the gas escapes from the balloon.

24. ### Chem

Complete and balance the molecular equation, including phases, for the reaction of aqueous sodium sulfate, Na2SO4, and aqueous barium nitrate, Ba(NO3)2. I don't know how to do this please help
25. ### Math

The error is that the kid should put the answer in cubic inches not square. The answer should be 300 in*3
26. ### CHEM

A reaction of 48.5 g of Na and 53.7 g of Br2 yields 55.4 g of NaBr. What is the percent yield? 2Na+Br2 2NaBr
27. ### chem

ok so far I have gotten 0.257 mol H2O2 0.169 mol N2H4 Im not sure where to go after this
28. ### chem

determine how many grams of N2 are produced from the reaction of 8.75 g of H2O2 and 5.43 g of N2H4. 2H2O2+N2H4 4H2O+N2 g N2?
29. ### chem

I mean how did you get the number 5
30. ### chem

How do you get 6 molecules or mols of C5H12
31. ### chem

If 6.64 moles of C5H12 reacts with excess O2, how many moles of CO2 will be produced in the following combustion reaction? Can plz explain how to do it Thank You
32. ### Math

DO NOT LISTEN TO @justtheretohelp, HE/SHE IS LYING!!! The real answers are: 1.C 2.C 3.C 4.C 5.C 6.A 7.A 8.A 9.C 10.A 11.B 12.D 13.C 14.A 15.B 16.A 17.C 18.A 19.A 100% I promise you! You will get 19/19+ whatever your teacher gives you. DO NOT LISTEN TO @justheretohelp, you will...
33. ### math

Solve the following system of equations: 4x+y–2z=10 2x–y+2z=–9 x+y+z=6
34. ### math

A rectangular playground is to be fenced off and divided in two by another fence parallel to one side of the playground. Five hundred and forty feet of fencing is used. Find the dimensions of the playground that maximize the total enclosed area. What is the maximum? area?
35. ### math

Determine whether QS || PT . Justify your answer. PQ = 18, QR = 6, RS = 12, ST = 36
36. ### math

Find x so that QS || PT PQ = 8, QR = 5, RS = 15, ST = x + 3
37. ### Math

A company makes batteries with an average life span of 300 hours with a standard deviation of 75 hours. Assuming the distribution is approximated by a normal curve fine the probability that the battery will last . Less than 250 hours b. Between 225 and 375 hours c. More than ...
38. ### Geometry

Complete two column proof. Given: x/6+2=15 Prove: x=78 x/6+2=15 A:______ x/6=13 B:______ x=78 C:_______ A:a. Given b. Subtraction Property of Equality c. Division Property of Equality B:a. Given b. Addition Property of Equality c. Multiplication Property of Equality C:a. Given...

im not sure if my question posted before because it isn't showing up when I look for it In /\?PRS, segment PT is an altitude and segment PX is a median. Find RS if RX = x + 7 and SX = 3x – 11 for this one I figured out that RS=4x+-4...but I think I need an actual ...
40. ### math

Matching: The segments used in reference to the triangle vs. concurrent point. Write the correct letter by the word. 1. Altitudes 2. Angle bisectors 3. Medians 4. Perpendicular Bisectors A. Centroid B. Circumcenter C. Incenter D. Orthocenter
41. ### math

In ?PRS, segment PT is an altitude and segment PX is a median. Find RS if RX = x + 7 and SX = 3x – 11 Find RT if RT = x – 6 and m?PTR = 8x - 6
42. ### math

In ?ABC, segment BF is the angle bisector of ?ABC, Segments AE, BF, and CD are medians, and P is the centroid. Find x if DP = 4x – 3 and CP = 30. Find y if AP = y and EP = 18
43. ### math

wait actually that question I posted before completing it...I will repost it
44. ### math

In ?ABC, segment BF is the angle bisector of angle ?ABC, Segments AE, BF, and CD are medians, and P is the centroid.

Yes
46. ### math

In a random sample of 200 students who were asked their favorite color, it was found that twenty more students liked blue than purple and eight fewer liked green than blue. Find the number of students who chose each color as their favorite.
47. ### Math

Given: measure of angle D=~ measure of angle F ; line GE bisects angle DEF Prove: line DG=~ line FG =~ is the congruent sign
48. ### Chemistry

The Haber process developed to produce fertilizer from nitrogen and hydrogen, is governed by the following unbalanced reaction: a N2 + b H2 -> c NH3 . If 10.5 kg of NH3 product is required, how many kg of hydrogen are required if nitrogen is in excess?
49. ### math

Given the function f(x) = x2– 3x + 3, find the following: f(-2) = _________ f(5) = _______
50. ### math

Give the domain and range of the following functions: f(x) = 1?4x – 7 g(x) = 3x2+ 2
51. ### Science

Scientific _____ involves knowledge and understanding necessary for evaluating information, making personal decisions, and taking part in public affairs. Please help!!
52. ### math

Find the midpoint of the line segment with endpoints (3, 10) and (–1, –16)
53. ### math

Find the slope of the line that goes through the points (-6, 3) and (2, 3).

Thank you!
55. ### Maths

Which works out at 4.8 bags?
56. ### Maths

A baker uses 3/5 of a bag of flour to make 6 muffins. How many bags of flour will he need to make 48 muffins?
57. ### math

Segments MN, LT, PQ, and OR all intersect at point S. If m?LSO = m?PSN , prove m?LSP = m?OSN . write a two column proof
58. ### Logic

Is this an imperative, declaritive, interrogative or exclamatory 1.God exist answer: exclamatory 2.What are you up to? answer: interrogative 3. Some dentist have clean teeth answer: imperative

It's 16?
60. ### math

A square 4 inches on a side is cut up into smaller squares 1 inche on a side. What is the maximum number of such squares that can be formed?
61. ### physics

Block A (mass = 3 kg), moving at +5 meters per second, collides with stationary block B (mass = 4 kg). Block A comes to a sudden stop, while block B starts moving. What will be the approximate final speed of block B?
62. ### Maths

Four decimal numbers are given below. Which THREE numbers, when added together, would result in a whole number? 0.9,0.45,0.65,0.3 0.9=9/10 0.45=45/100(9/20) 0.65=65/100(13/20) 0.3=3/10 Can you plz help me!!! Thanks
63. ### Geometry

TV screens are measured on the diagonal. If we have a TV-cabinet that is 72 inches long and 64 inches high, how large a TV could we put in the space (leave 2-inches on all sides for the edging of the TV)? Round your answer to the nearest tenth.
64. ### Algebra 2

Write a polynomial function f of least degree that has rational coefficients, a leading coefficient of 1, and the given zeros 2, 2i, and 4-sqrt 6
65. ### Math

Fraction: M is 1/6. A is 1/4. T is 1/6. H is 1/12. E is 1/12. I is 1/12. C is 1/12. L is 1/12. Decimal: Both M and T are 0.166667, A is 0.25, and H,E,I,C,and L are all 0.083333 Percentage: M is 16.6%. T is 16.6%. A is 25%, H is 8.3 %. E is 8.3%. I is 8.3%. C is 8.3%. L is 8.3%
66. ### Geometry

A flat screen television is advertised as being 59 inches on its diagonal. If the TV is 13 inches tall, then how wide is the screen?
67. ### Maths

Is it A=SxS 2mx2m=4m 1m=100cm =400/20=20tiles
68. ### Maths

A tile layer is laying tiles on a square wall of sides 2metres. If each tile measures 20cm by 20cm,calculate: 1. The number of tile required to tile the entire wall. 2. The cost of the tiles if they are sold at \$2.00 each.
69. ### Maths

Plz help me understand this
70. ### Maths

Judy made a rectangular shaped figure of dimensions 20cm by 5cm with a piece of clay . She then took the same amount of clay and made a square figure. If the thickness of the square is the same as that of the rectangle, calculate the length of one side of the square figure ?
71. ### Math

A square field has a side of 50 meters.How many times must an athlete jog around this field to cover a distance of 3 kilometers? Area = S x S = 50 × 50 =2500 meters .... I'm stuck
72. ### science

How would you separate a mixture of small beads, sand, iron filings, salt, and water, using a magnet, filter funnel, filter paper, bunsen burner and a tripod with a bunsen burner? I thought of Filtration, Evaporation, Distillation, Magnetism, and even Sieving but only 4 of ...
73. ### Geography

Why did the original farms on the Prairies turn out to be too small? What happened as a result of this?
74. ### chem

How many moles of O2 are contained in 5.25 L at 26 degrees Celsius and 1.2 atm?
75. ### Pre calc

Sorry steve not everyone is as smart as you. Thanks for your help tho
76. ### Pre calc

Please help me proof the identity. This isn't even math to me, I can not understand it so please show all work. God bless A)1-cos2x/sin2x=tanx B) sin4x/sinx=4cosxcos2x

78. ### Pre calc

The answer I keep getting is -3 square root of 10 over 130
79. ### Pre calc

sin(? ? ?); tan(?) = 5/12 ? in Quadrant III, sin(?) = ? sqaure root 10/10 ? in Quadrant IV I tried this numerous times can somone please help me
80. ### Chemistry

Assume you are performing the calibration step and you begin with 70 g of water at 20*C and 70 g of water at 80*C. After adding the two portions of water into your calorimeter setup and following the procedure outlined in the experiment, you determine the temperature of the ...

1-cos (2A)/2sin A+ SIN (2A)= tan (A/2) I need to verify the identity I have no idea how to do that and I have a test please explain!!!
82. ### Calculus

the problem is asking me to use optimization to find the minimum surface are and then determine how much it would cost to make it
83. ### Calculus

A manufacturer needs to produce a cylindrical can with a volume (capacity) of 1000cm cubed. The top and the bottom of the container are made of material that costs \$0.05 per square cm, while the side of the container is made of material costing \$0.03 per square centimeter. ...
84. ### pre calc

To measure the height of the cloud cover at an airport, a worker shines a spotlight upward at an angle 75° from the horizontal. An observer D = 600 m away measures the angle of elevation to the spot of light to be 45°. Find the height h of the cloud cover. (Round your ...
85. ### A.P Chemistry

For a certain reaction ?H is 54 kJ/mol and ?S is 128 J/mol · K. This reaction can become spontaneous only above some temperature. What is this temperature? Answer in units of ?C.
86. ### Math

Find the magnitude and direction angle of p = 42i + 35j
87. ### Math

Find the exact value of the trig function below. cos a/2 if cosa = - 31/49 (assume cos a/2 is negative)
88. ### civics

C. Major rule. The people were supposed to be able to have control over the laws that were made and how their country was ruled. Decisions were made based on the majority of opinion.
89. ### math

I meant to type that it seemed like it would cost at least 1,000
90. ### math

The annual cost of a gym membership can be represented by the function C(t)=300-5t, where t is the number of years that one has belonged to the gym. If Jeffrey has been a member for 5 years, what is the total amount of money that he has paid to the gym over the past 5 years. I...
91. ### math

There are 4 romantic novels and 6 adventurous novels on a book shelf. Without looking, Carmen chooses two novels out of the shelf. What is the probability that she chooses 2 romantic novels?
92. ### math

The probability that Jeff will be accepted to Green Valley College is 3/4, and the probability that Justin will be accepted to Blue Ridge College is 2/5. What is the probability that Justin will be accepted and Jeff will not?
93. ### math

If 8^x = 12, then 24^x = ? Estimate your answer to one decimal place.
94. ### math

If 8.2^p = 10.5^q, then p/q = ? Estimate your answer to two decimal places.
95. ### math

That was my mistake. It was supposed to say k=?
96. ### math

If 16x^2 - 24x + k = 0 has two roots (a double root) equal to 3/4, 4 = ?
97. ### math

For his troops' popcorn fundraiser sale, Mike sold caramel corn for \$10, buttered microwave popcorn for \$8, and lightly buttered popcorn for \$7. By the end of the fundraiser, he had sold 400 items and made \$3,272. If he sold twice as many lightly buttered microwave popcorn...
98. ### physics

a force of 372 N is used to move a piano with a maass of 532 kg up a ramp 14 m long. what is the vertical height of the ramp
99. ### math

If g(x)=x+3 h(x)=9-x^2, what is the maximum of h(g(x))?
100. ### Math

If cscØ = 4/3, find sinØ + sinØ cot^2 Ø
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