# Posts by k

Total # Posts: 1,052

1. ### Biology

What selective advantages drove the development of sexual reproduction, and how did it develop?

kn kj

kn kj
4. ### Science

The dimensional formula of density of pressure is D= force/ area = Md^-1T^-2 What does M, d and T and their exponents mean?
5. ### Physics

A Ferris wheel with radius 9.5 m initially rotates at a constant rate by completing 0.75 rev in 25.00 s. It then begins to decelerate at a rate of 0.30 rad/s2 with its only passenger at the top of the wheel. Find the direction of the total acceleration vector. Express your ...
6. ### Second solution for ambiguous case?

Given a = 31.5, b = 51.8, A = 33 degrees, find the value of c in triangle ABC. bsinA = 51.8sin33 = 28.21 -> bsinA < a < b so there are two solutions Using sine law: sinB/b = sinA/a sinB/51.8 = sin33/31.5 sinB = 51.8 * sin33/31.5 sinB = 0.895628635 B = arcsin(0....

thanks
8. ### Math

Question : find (h,k) and radius x^2 + y^2 +1/2x + 2y +1/16 = 0 According to the equation : (x?h)^2+(y?k)^2 = r^2 x^2 + y^2 +1/2x + 2y +1/16 = 0 (x^2+1/2x+1/16)+(y^2+2y+1)=?1/16+1/16+1 (x+1/4)^2+(y+1)^2=1 so (h,k) = (-1/4, -1) and r = 1 theres no answer to even number from the...
9. ### Math

A car traveling from town A to town B at an average speed of 80 km/h took 54 minutes. Another car took 40 minutes to travel the same distance. What was the difference in their speed in km/h?
10. ### chemistry / science

With regard to Stainless Steels, how is a passive layer regenerated? thanks in advance!!
11. ### math

An Artisan has 63 kg of metal of density 7,000kg/m3. He intends to use make a rectangular pipe with external dimensions 12 cm by 15 cm and internal dimensions 10 cm by 12 cm. Calculate the length of the pipe in meters.
12. ### math

Manyatta Village is 74 km North West of Nyangata Village. Chamwe village is 42 km west of Nyangata. By using an appropriate scale drawing, find the bearing of Chamwe from Manyatta.
13. ### math

The angle which the tangent to the curve at the point (2, 5) makes with the horizontal
14. ### Math

The Position of two A and B on the earth’s surface are (36°N, 49°E) and (36°N, 131°W ) respectively. (a) The difference in long between town A and town B (2 marks) (b)) Given that the radius of the earth is 6370, calculate the distance town A and town B. (...
15. ### math

Find the reciprocal of 0.342. Hence evaluate:(?0.0625/0.342)
16. ### Chem - Redox rxn

Just wanna make sure, if i did it correct or not. Cl2 + 2NaBr --> Br2 + 2NaCl (0)---(+1)--(-1)---(0)------(+1)(-1) So Cl2 loss = oxidation Br2 Gain = Reduction Am I correct ? Thanks
17. ### Math

The flask consist of a cylindrical part and a frustum of a cone. The diameter of the base is 10 cm the diameter is 2 cm while that of neck is 2 cm. The vertical height of the flask is 12 cm. (a) the slant height of the frustum part; (b) the slant height of the smaller cone ...
18. ### Math

The flask consist of a cylindrical part and a frustum of a cone. The diameter of the base is 10 cm the diameter is 2 cm while that of neck is 2 cm. The vertical height of the flask is 12 cm. (a) the slant height of the frustum part; (b) the slant height of the smaller cone ...
19. ### Math

Height = 12 - 2 = 10 Cylindrical part = 12 - 2 = 2
20. ### Math

The flask consist of a cylindrical part and a frustum of a cone. The diameter of the base is 10 cm the diameter is 2 cm while that of neck is 2 cm. The vertical height of the flask is 12 cm. (a) the slant height of the frustum part; (b) the slant height of the smaller cone ...
21. ### Chemistry

A 50.0 ?mL sample of 1.50×10?2 M Na2SO4(aq) is added to 50.0 mL of 1.23×10?2 M Ca(NO3)2(aq). What percentage of the Ca2+ remains unprecipitated? Calculate the moles of Ca(NO3)2 you have (concentration * volume in L). Moles of Ca(NO3)2 = moles of Ca+2 per the ...
22. ### Chemistry

A possible reaction for converting methanol to ethanol is CO(g)+2H2(g)+CH3OH(g)?C2H5OH(g)+H2O(g) ?H0 for this reaction at 25?C. ?H0 = -165.7 kJ ?S0 for this reaction at 25?C. ?S0 = -227.4 J/K ?G0 for this reaction at 25?C. ?G0 = -97.9 kJ - Estimate Kp for the reaction at 740 K...
23. ### Math

The flask consist of a cylindrical part and a frustum of a cone. The diameter of the base is 10 cm while that of neck is 2 cm. The vertical height of the flask is 12 cm. (a) the slant height of the frustum part; (b) the slant height of the smaller cone that was cut off to make...
24. ### Math

Two shopkeepers, Juma and Wan bought some items from a wholesaler. Juma bought 18 loaves of bread, 40 packets of milk and 5 bars of soap while Wan bought 15 loaves of bread, 30 packets of milk and 6 bars of soap. The price of a loaf of bread, a packet of milk and a bar of soap...
25. ### Math

Two shopkeepers, Juma and Wan bought some items from a wholesaler. Juma bought 18 loaves of bread, 40 packets of milk and 5 bars of soap while Wan bought 15 loaves of bread, 30 packets of milk and 6 bars of soap. The price of a loaf of bread, a packet of milk and a bar of soap...
26. ### math

Three factories Buka, Sakono and Rama produce sugar in one hundred kilogram bags daily. Buka produces three times as much as Rama. Sakono produced two times as much as Rama. If Sakono produces 500 bags, how many tones altogether do three factories produce daily? Rama = r Buka...
27. ### Chemistry - acid base

You are asked to bring the pH of 0.500 L of 0.450 M NH4Cl to 7.00. 12.0 M NH3 How many drops (1 drop 0.05 mL) of this solution would you use? What I did, but its incorrect Using HH equation I found out NH4 pKa = 9.24 from table pH = pKa + log [A-] / [HA] 7.00 = 9.24 + log [NH3...
28. ### Chemistry - acid base

Okay I'll try. Thanks for your time
29. ### Chemistry - acid base

There isn't Ksp given in the question. What to do?
30. ### Chemistry - acid base

A 50.0 mL sample of 1.50×10?2 M Na2SO4(aq) is added to 50.0 mL of 1.23×10?2 M Ca(NO3)2(aq). What percentage of the Ca2+ remains unprecipitated? What I did n=CV Na2SO4 = (1.50×10?2 M)(0.05L) = 0.00075 Ca(NO3)2 = (1.23×10?2 M)(0.05L) = 0.000615 0.00075 - ...
31. ### Chemistry - acid base

What volume of 10.0 M NaOH is needed to prepare a buffer with a pH of 7.79 using 31.52 g of TrisHCl? ( Tris. At 25 ?C, Tris has a pKb of 5.91 ) a) The buffer from Part A is diluted to 1.00 L. To half of it (500. mL), you add 0.0250 mol of hydrogen ions without changing the ...
32. ### Math

The two legs of a right triangle are in the ratio ?3/2. If the hypotenuse is 10 units long, find the area (in square units) of the triangle. Please provide COMPLETE solution and FINAL ANSWER.
33. ### Math

The two legs of a right triangle are in the ratio ?3/2. If the hypotenuse is 10 units long, find the area (in square units) of the triangle.
34. ### Pre-Algebra

Ok i understand i am stuck on this question If m<1 = 53, what is m<4? 53 43 37 27 If m<4 = 25, then what is m<8? 105 75 175 25
35. ### Pre-Algebra

Hi has anyone done lesson 10: Geometry Unit Test Essential Algebra Readiness (Pre-Algebra) B Unit 1: Geometry i really need help has anyone done it please if u have please help!!!!
36. ### Pre-Algebra

Hi i need help with lesson 10: Geometry Unit Test Unit 1 1. Name a pair of complementary angles. 1 and 4 1 and 2 3 and 4 1 and 6 2. If m<1 = 53, what is m<4? 53 43 37 27 3. If m<1 55, what is m<5? 55 40 35 25 Please help me :(
37. ### Chem

A sample of NH4HS(s) is placed in a 2.61 ?L flask containing 0.120 mol NH3(g). NH4HS(s)?NH3(g)+H2S(g) Kp=0.108 at 25?C Part A What will be the total gas pressure when equilibrium is established at 25?C? I'm getting P = 1.21atm which is wrong. Can any1 please help. Thanks
38. ### Chem

A sample of NH4HS(s) is placed in a 2.61 ?L flask containing 0.120 mol NH3(g). NH4HS(s)?NH3(g)+H2S(g) Kp=0.108 at 25?C Part A What will be the total gas pressure when equilibrium is established at 25?C? I'm getting P = 1.21atm which is wrong. Can any1 please help. Thanks
39. ### Math

the position vectors od points A and B woth respect to the original O, are (-8,5)and (12,-5) respectively. point M is the midpoint of AB and N is the midpoint of OA. Fin the coordinate of N and M; the magnitude of NM
40. ### Math

Use mathematical induction to prove the property for all positive integers n. A factor of (n^3+3n^2+2n) is 3.
41. ### Math

Multiply the numbers together. Area of rectangular prism = length x width x height
42. ### Math

Multiply the numbers together. A of rectangle = length x width
43. ### Math

Three factories Buka, Sakono and Rama produce sugar in one hundred kilogram bags daily. Buka produces three times as much as Rama. Sakono produced two times as much as Rama. If Sakono produces 500 bags, how many tones altogether do three factories produce daily?
44. ### Math

Twenty members of a group contributed sh 80000 each to buy a piece of land. They already had sh 120000 in a bank out of which sh 20000 was to remain in the bank and the rest spent in buying the price of land. How much did the piece of land cost?
45. ### Math

Twenty members of a group contributed sh 80000 each to buy a piece of land. They already had sh 120000 in a bank out of which sh 20000 was to remain in the bank and the rest spent in buying the price of land. How much did the piece of land cost?
46. ### Math

Pupils in a school prepared a circular flower garden of diameter 28 meters. They dug holes each 4 meters apart along the circumference for planting flowers. How many holes were dug?
47. ### math

The number of children at a film show was 49 more than that of adults . They entry fee for each child was sh 15 while that of each adult was sh 30. The total amount of money paid by the was sh 2055. How much money was paid by the children and the adults altogether?
48. ### Math

Mwachia and Mbuu shared some money in the ratio 5:2. Mbuu received sh 30 less than Mwachia. How much money did Mbuu get?
49. ### Math

A tailor made 48 pieces of uniform. Half of the number of the uniforms was each made using 1 1?4 meters of material. A quarter of the remainder was each made using 1 1?2 meters of material and the rest was each made using 1 3?4 meters of material. The tailor also fixed a logo ...
50. ### Math

Lesson 10: Geometry Unit Test B Unit 1: Geometry 1.B 2.C 3.D 4.C 5.C 6.A 7.D 8.C 9.B 10.B 11.A 12.A 13.A 14.B 15.C 16.C 17.C 18.B 19.B I got a pretty bad grade so i just wanted to help u guys who were having trouble
51. ### Government HELP

How are the first amendment rights seen in the constitution? Like how congress can't change religion
52. ### Math

In a cupboard there are pencils, rulers and books. The number of pencils is 15 more than that of rulers. The number of books is three time that of rulers. If the number of pencils is p, which one the total number of items in the cupboard?
53. ### math

What is the area of the region bounded by the x-axis and the lines x+y=24 and 3x-2y=12? Please show full solution and explanation
54. ### math geometry

A right circular cone has a base diameter of 10 and a height of 18. A second right circular cone has a base diameter of 15. If the volume of the second cone is equal to the volume of the first cone, then what is the height of the second cone? provide complete solution w ...
55. ### math

God bless you Damon and I hope you have a lovely day!
56. ### math

A right circular cone has a base diameter of 10 and a height of 18. A second right circular cone has a base diameter of 15. If the volume of the second cone is equal to the volume of the first cone, then what is the height of the second cone?
57. ### math

The Southeastern Conference (SEC), has fourteen universities, each of which fields a football team. The football teams are divided into two seven-team divisions. Each season, every team plays every other team in its division once, and also plays two teams from the other ...
58. ### math probability

Three cards are drawn at random without replacement from a standard fifty-two card deck of playing cards. What is the probability that among the three cards there is a pair or three of a kind? please provide complete solution with explanations:)
59. ### math

Ben can run six miles in forty-eight minutes. If Luke can run twenty percent faster than Ben, how many minutes will Luke take to run nine miles? Please provide COMPLETE solutions with explanation please

1. Write the equation of a line in slope intercept form that is parallel to y = 3x - 2 and passes through the point (-2, 1) y = -3x-5? 2. Write the equation of the line that passes through (2, 1) and is perpendicular to 5x + y = 9. x + 5y = 3?
61. ### Math

3 each if there are 4 friends. 20-8 family members =12 cookies, so 12 divided by 4 friends is 3 each. 3*4=12
62. ### MATH (HARD!)

Is it 3.6 + 4.2 Added these are 7.8 Mulitply by 1.5 to get. 11.7 Could be wrong but thats what i think
63. ### Mathss

Item 20 A bathtub is draining at a constant rate. After 2 minutes, it holds 28 gallons of water. Three minutes later, it holds 7 gallons of water. Write an equation that represents the number y of gallons of water in the tub after x minutes.

km
65. ### Algebra: simplifying polynomials

Please simplify the following. Please show solution if possible:) Question 1: (x^3 + x^2 - y^3 - y^2) / (x^2 - 2xy + y^2) Question 2: (u^6 + v^6 + 2u^3 • v^3) / [u^3 - v^3 + (u^2 • v) - (u • v^2)]
66. ### History

How are religion and culture connected? (Essay)
67. ### Chemistry

how'd you get 12.3 degrees C
68. ### Chemistry

u know how to do the third one?
69. ### Chemistry

12.3 degrees Celsius do we have the same lab?
70. ### Math

Determine the number of factors of 5^x + 2•5^x+1. Choices: A) x B) x + 1 C) 2x D) 2x + 2 Please show solution:)
71. ### Math

Thank you and God bless
72. ### Math

Determine the number of factors of 5^x + 2•5^x+1. Choices: A) x B) x + 1 C) 2x D) 2x + 2 Please show solution:)
73. ### math

Find the 6th term in the expansion (x^2 - 1/x)^25 It is a Binomial Theorem problem and I am extremely confused. Please and thank you!
74. ### Surface area of threaded hollow tube

I have a question for calculating the surface area of a threaded cylinder,there are ten about 19 little threads in one inch, the rod is about 6 inches, the outer diameter is about 0.6 in and the inner diameter is 0.02. Each thread is 0.014 thick if that matters, I just have no...
75. ### biology

In order to maintain homeostasis, human cells must have a higher concentration of sodium ions outside the cell than inside the cell. In addition, the concentration of potassium ions must be higher inside the cell than outside the cell. Which of the following forms of cellular ...

Tickets
77. ### English

"The sun was shining on the sea, Shining with all his might: He did his very best to make The billows smooth and bright — And this was odd because it was The middle of the night. The moon was shining sulkily, Because she thought the sun Had got no business to be ...
78. ### Math geometry

1) The base angles of an isosceles triangle are (50-x)^6 and (30x-12)^6 what is the vertex angle? 2) The area of a trapezoid is 52cm^2 if it's bases are 8 cm apart find the sum of their heights 3) What is the area of a circle inscribed inside an equilateral triangle whose ...
79. ### Social Studies

lesson 11: The Canadian Mosaic Social Studies 7 B Unit 1:Build a Regional Background: The U.S and Canada 1.A 2.D 3.A 4.C 5.C 6.C 7.A 8.C 9.C 10.D
80. ### Math

How many positive integers, not having the digit 1, can be formed if the product of all its digits is 33750. With solution pls:)
81. ### algebra

What is 7 more than five times the number 9 divided by 15?
82. ### Math

K: 1) simplify: 1 - 1/2 + 1/4 - 1/8 + 1/16 - 1/32 2) Simplify: (1/2 - 1) - (1/3 - 1) + (1/4 -1) 3) In the proportion x^2 : 27 = 9 : x^3, what is x? 4) Between what two consecutive integers does cube root of -100 lie? 5) What is the area of a rectangle whose sides are thrice as...
83. ### Mathematics

2 people are in one red car 1 red car = 2 2 red cars = 4 1st blue car = 1 2nd blue car = 3 3rd blue car = 4 So 2+2+1+3+4 = 12 :)
84. ### Social Studies

a b d correct
85. ### Social Studies

oof yeah its correct
86. ### math

Part of the road is to be on a parabolic curve given by a function of the form y = ax2 + bx + c where x and y are local co-ordinates. The road alignment must pass through the following 3 points:- x = 150m y = 190.650m x = 300m y = 611.450m x = 450m y = 831.141m 5.1. Substitute...
87. ### Math

yeah eyeless jack is right
88. ### American Government

Thanks Ms. Sue! I only got one wrong, which was 6. 6 is A.
89. ### American Government

I need help on my American Government quiz.. Not looking for answers but for someone to see if mine are right, and if not, to help me out. Thanks! 1. When categorizing the Executive Offices of the President, what can you assume when noting the number of departments devoted to ...
90. ### Math

SOMEONE HELP ME
91. ### Math

Key:8 | 3= 8.3 what does 7|2 mean in the same stem and leaf plot

roasted
93. ### Pre cal

Determine all x-intercepts, vertical asymptotes, horizontal asymptotes, and removable discontinuities of f (x)=(x^2-x-6)/(x^3-4x).
94. ### biology

If the first child of a couple was without dimples, an recessive trait, what is the chance that the second child will be born without dimples? A) 100% B) 25% C) 50% D) Cannot be determined from the phenotype of the child

96. ### math

If lim?(n??)??(x_n-x)/(x_n+x)?=0, prove that lim?(n??)??x_n ?=x.