Lucas

Most popular questions and responses by Lucas

Why did many Texans become concerned after Abraham Lincoln was elected president? a.They were afraid Sam Houston would start a revolution b.They were afraid slavery would be abolished c.They were afraid taxes would increase. d.They were afraid the South

A fish tank in the shape of a cuboid has length 320 cm. Its length is twice that of its width. To enhance viewing, the area of the four vertical faces should be maximized. Find the optimum "viewing area" of a fish tank that is fixed to the wall so that the

3. Math

The sum of two numbers is 82. The difference is 16. What are the two numbers?

4. PHYSICS

A 75 g bungee cord has an equilibrium length of 1.20 m. The cord is stretched to a length of 1.80 m, then vibrated at 20 Hz. This produces a standing wave with two antinodes. What is the spring constant of the bungee cord?

5. PHYSICS

The electron gun in a television tube uses a uniform electric field to accelerate electrons from rest to 5.0×107 m/s in a distance of 1.2 cm. What is the electric field strength?

6. math

A farmer has 110 metres of fencing to fence off a rectangular area. Part of one side is a wall of length 15m. Find the dimensions of the ﬁeld that give the maximum area. Answers: length and width = 31,25m Thank you so much for a huge help.

7. Math

A sphere's radius expands from 1.0m to 1.1m. Using differentials, what is the change in the volume of the sphere (in m3)? The volume of a sphere is given by V=4/3∏r3.

8. math

A company's weekly profit, in riyals, is modeled by the function P(u)=-0.032u^2+46u-3000. where u is the number of units sold each week. a) the maximum weekly profit. Answer: 13531.25 riyals b) the loss for week's holiday period, where no units are sold

9. Math

In an arithmetic progression, the 5th term is six times the 1st term and the sum of the first six terms is 99. Find the 1st term and the common difference. Attempt at solution: U5 = 6(U1) 99 = 3(2[U1] + 2d)

4(7x-4) =124

11. PHYSICS

An electron iwth an initial speed of 500,000 m/s is brought to rest by an electric field. (a) Did the electron move into a region of higher potential or lower potential? (b) What was the potential difference that stopped the electron?

12. chemistry

A chemistry student weighs out 0.172 grams of acrylic acid (HCH2CHCO2) into a volumetric flask and dilutes to the mark with distilled water. He plans to titrate the acid with 0.1800 moles/liter NaOH solution. Calculate the volume of NaOH solution the

13. Math

You run a small furniture business. You sign a deal with a customer to deliver up to 500 chairs, the exact number to be determined by the customer later. The price will be \$120 per chair up to 400 chairs, and above 400 the price will be reduced by \$0.25

14. Math

In a group of 105 students, 70 students passed Mathematics, 60 students passed History and 45 students passed Geography; 30 students passed Mathematics and History, 35 students passed History and Geography, 25 passed Mathematics and Geography, and 15

15. chemistry

Arrange the species O2, O2^+, O2^-, and O2^2- in order of increasing O-O bond length.

16. biology

What does the word cycle tell you about the chemical reactions of the Calvin cycle?

17. PHYSICS

A heavy piece of hanging sculpture is suspended by a 90 cm long, 5.0 g steel wire. When the wind blows hard, the wire hums at its fundamental frequency of 80 Hz. What is the mass of the sculpture?

18. math

A rocket follows a parabolic trajectory. After t seconds, the vertical height of the rocket above the ground, in metres, is given by H(t) = 37t – t . Find the length of time the rocket is in the air. Could you please explain me, why answer is 37s? Thank

19. physics

One simple model for a person running the 100m dash is to assume the sprinter runs with constant acceleration until reaching top speed,then maintains that seed through the finish line.if sprinter reaches his top speed of 11.1m/s in 2.54s. What will be his

20. Maths

An arithmetic and a geometric sequence have the same first terms.(2)....and the same second term say X..The sum of the first 3 terms of the arithmetic sequence equals to the third term of the geometric sequence.Calculate the first 3 terms of each sequences

21. Maths

1..The first 2 terms of a geometric progression are the same as the first two terms of an arithmetic progression.The first term is 12 and is greater than the second term.The sum of the first 3 terms od the arithmetic progression is 4/3 less than the sum of

22. Math

A 60-footpiece of wire is strung between the top of a tower and the ground, making a 30-60-90 triangle. How far from the center of the base of the tower is the wire attached to the ground? How high is the tower?

23. Math

You run a small furniture business. You sign a deal with a customer to deliver up to 500 chairs, the exact number to be determined by the customer later. The price will be \$120 per chair up to 400 chairs, and above 400 the price will be reduced by \$0.25

24. Math

You run a small furniture business. You sign a deal with a customer to deliver up to 500 chairs, the exact number to be determined by the customer later. The price will be \$120 per chair up to 400 chairs, and above 400 the price will be reduced by \$0.25

25. Math

An arithmetic series has first term -50 and common difference 4. How many terms are in the series so that the sum of the series first exceeds 100?

26. algebra

A rectangular prism has a volume of 750 cubic millimeters. Its length is 15 millimeters, and its width is 10 millimeters. What is its height

27. math

Two students, Mary and John, play a game. Each time Mary passes “start” she received \$25. Each time John passes “start” he receives 15% of the amount he already has. Both students start with \$200. a. How much money will Mary have after she has

28. science

find the angle of elevation of a gun that fires a shell with a muzzle velocity of 120m/s and hits a target on the same level but 1300m distant.

29. Math

A swimming pool is in the shape of a cuboid with dimensions 50 metres long by 25 metros wide by 2.5 metres deep. If the pool is completely filled with water, calculate a) the volume of water in the pool b) the longest straight distance a swimmer could swim

30. Math

An oil rig breaks and begins to leak oil into the arctic ocean at an increasing rate of R(t) = 20t + 20 litres per day. At the instant of breakage (t=0), 100 litres of oil was spilled into the ocean via the emergency release valve. What is the equation

31. math

In a group of 105 students, 70 students passed Mathematics, 60 students passed History and 45 students passed Geography; 30 students passed Mathematics and History, 35 students passed History and Geography, 25 passed Mathematics and Geography, and 15

32. geometry

A tetrahedron is a triangular pyramid in which each face is an equilateral triangle. Calculate the volume of a tetrahedron that has all its edges 6 cm in length. Hint: You will need to know some geometry and trigonometry.

33. math

A company's weekly profit, in riyals, is modeled by the function P(u)=-0.032u^2+46u-3000. where u is the number of units sold each week. a) the maximum weekly profit b) the loss for week's holiday period, where no units are sold c) the number of units sold

34. Math

The exchange rate from US dollars (USD) to euros (EUR) is given by 1 USD = 0.753 EUR. Give the answers to the following correct to two decimal places. Roger receives 800 Australian dollars (AUD) for 610 EUR. Calculate the value of the US dollar in

35. Algebra

The Smiths invested \$14,000, part at 3% simple interest and the rest at 4% simple interest for a period of one year. if the total interest earned was \$460, how much was invested at each rate?

36. English- Lord of the Flies

CHAPTER 7 (#1)- When the boar charges, what does ralph do? (#2)-What part does civilization play in dictating a need for good grooming?

37. math

On the first day he runs 1.5 km. Every day he runs 10% more than the day befor. a) Write down the distance he runs on the second day of training. ..... 1,5km +0,15 = 1,65 km b) Calculate the total distance He runs in the first seven days of training. When

38. math

A company's weekly profit, in riyals, is modeled by the function P(u)=-0.032u^2+46u-3000. where u is the number of units sold each week. a) the maximum weekly profit. Answer: 13531.25 riyals b) the loss for week's holiday period, where no units are sold

39. Math

kyle just started a new job that pays \$7 per hour. He had been making \$5 per hour at his old job. Kyle worked a total of 54 hours last month and made \$388 before deductions. How many hours did he work at his new job?

40. Math

A 60-footpiece of wire is strung between the top of a tower and the ground, making a 30-60-90 triangle. How far from the center of the base of the tower is the wire attached to the ground?How high is the tower? (The center of the base would be the point

41. algebra

1/4 times 1/2 = 4d

42. math statistic

In Megabucks, a player who correctly chooses five out of the six winning numbers gets \$400. What is the probability of winning \$400? Answer is 0.0000924 in the book but I really don't know where I'm doing mistake. my work is = 6!/5!(1!) combination Thank

43. Maths

Eric thinks of 2 sequences.One is geometric and the other arithmetic.Both sequences start with the number 3.The common ratio of the geometric sequence is the same as the common difference of the arithmetic sequence.If the 6-th term of the geometric

44. materials bahavior

A specimen has an initial diameter of 200mm and a length of 700mm. At a stress of 40MPa and a temperature of 538oC the steady state strain rate is about 2×10−4% per hour. Find the primary creep elongation and the steady state creep elongation after 5000

45. geometry

The sector shown is formed into a cone by joining its two radii. Calculate the volume of the cone correct to the nearest whole number. It shows a diagram with a 240 degree sector or two-thirds of a circle with a radius of 12 cm. How do I do this? Thank you

46. Science

A microwave oven supplies 1.000kj per second.how many min should be set on the microwave in order to heat 250.g of water from 24.3 degrees c to its boiling point?

How do you find the dimensions of a box that hold 2xs as many cubes as a box that is 2 by 3 by 4?

48. physics

football is kicked off with an initial speed of 66 ft/s at a projection angle of 45 degrees. A receiver on the goal line 63 yd away in the direction of the kick starts running to meet the ball at that instant. What must be his minimum speed (in

49. Math

Train A and train B leave station going in opposite directions. Train B leaves 1/2 later than train A. Train B travels 80km/h faster than Train A. In 2 hours the trains are 3200KMs apart. How fast is each train traveling.. thank you

50. Math

Find the minimum number of terms in the geometric series 10 + 8 + 32/5 + ... such that the sum is greater than 49.

51. College Algebra II

A patient’s cost for a hospital stay is determined as follows: Admission = \$50 Room charge: first night: \$1000 nights 2-4: \$1500 per night night 5 and beyond: \$2000 per night Surgery: \$8500 per surgeon, plus \$3000 for an anesthesiologist (a) What would

52. Calculus

A rancher wants to make an animal pen by fencing in an area of 2500000 square feet in a rectangular field and then divide it up with 5 fences down the middle parallel to one side. The rancher wants to use the shortest total length of fencing possible. If

53. Maths and science

The sum of the first n terms of a sequence is given by 4-4(1/2)^n.calculate the first 3 terms

54. chemistry

3Ag(s)+4HNO3(aq)-->3AgNO3(aq)+NO(g)+2H2O(l) Write the new ionic equation.

55. Math

kyle just started a new job that pays \$7 per hour. He had been making \$5 per hour at his old job. Kyle worked a total of 54 hours last month and made \$388 before deductions. How many hours did he work at his new job?

56. english

lord of the flies - what does ralph daydream about in chapter 7

57. Maths

A rectangular room 8m long by 5m wide contains 129m square of air. Calculate the height of the room. I assume that the above question is a trick question. Since the room is 8m high, it then goes that the height I 8metres. Thank you.

58. math

A farmer has 110 metres of fencing to fence off a rectangular area. Part of one side is a wall of length 15m. Find the dimensions of the ﬁeld that give the maximum area. Thank you so much for a huge help.

59. AP Physics

A car slows down from 18 m/s to rest in a distance of 91 m. What was its acceleration, assumed constant?

60. chemistry

What would happen if MnO2 was mixed with KBrO3 ND 9 M sulfuric acid?

61. math

Write two other ratios equal to 9/12?

62. chemistry

An element has an ion with +2 charge.It has 38 electrons and 51 neutrons. write the nuclear symbol for the element.

63. Maths

A farmer deposits R11 944, for 60 months to buy a tractor.suppose that 12 months afta the purchase of the present tractor and every 12 months thereafter,the farmer withdraws R5000 from his account to pay for maintanance of the tractor.If he makes such

64. Maths

Thato caught 4 snails and placed them all in the same small circle on the ground and organised a race......1st snail travelled 24cm in 4minutes,2nd snail travelled 35 cm in 7minutes,3rd snail travelled 33cm in 5minutes and the 4th snail travelled 39cm in

65. ferreira

i need helo with this poem for sci that is about chlorine can some one help me

66. chemistry

I^- H5IO6 BrO2 HClO I2 Which could not disproportionate?

67. Chem

Using condensed electron configurations, give reactions showing the formation of the common ions of the following elements. (Type your answers in the following order. In the first box enter your answer using the format [Ar] 4s2 3d10 4p2 for [Ar]4s23d104p2.

68. physics

A 2.000-kg particle rests on a frictionless horizontal surface and is attached to the free end of a spring. The particle is pulled horizontally so that it stretches the spring 0.05 m and is then released from rest at t = 0. Determine the displacement, x,

69. chemistry

The molecular structure around the oxygen in water is ? The molecular structure around all the carbons in ethanol is ?

70. Geometry

If each of the sides of an isoceles triangle is 5 x the size of the baseline and the perimeter of the triangle is 121 cm, how many centimeters is each of the sides of the triangle? I have the sides at 50 cm and the base at 21cm. ?

71. Algebra 2 (Math)

Solve by the system of equations by substitution. x + 2y + z = 14 y = z + 1 x = -3z + 6 Anyone able to help me with this? I've been stuck on it all day and can't seem to solve it, it doesn't make any sense to me.

72. math

This year Gloria's garden is one foot wider and three feet shorter? What were the dimensions of the garden last year?

73. Math

An individual federal tax return form asks, among other things, for the following information: income (in dollars and cents), number of dependents, whether filing singly or jointly with a spouse, whether or not deductions are itemized, amount paid in local

74. Math

ln(y-9)-ln7=x+lnx Thank you sooo much for helping:))))

75. Physics

There are 2 objects connected with ideal, massless string that is hanging over an ideal (massless and frictionless) pulley. The angled surface is at a 25.0 degree angle. All surfaces are firctionless. A force F1 is applied horizontally as shown to the

76. Math

Claire wants to determine how brightly to illuminate her stage. stage width (in metres) x stage length (in metres) x 0.14 = total watts for stage If her stage is 7.25 metros wide and 11.5 metres long, a) calculate the exact number of watts needid to

77. math

Claire wants to determine how brightly to illuminate her stage. stage width (in metres) x stage length (in metres) x 0.14 = total watts for stage If her stage is 7.25 metros wide and 11.5 metres long, a) calculate the exact number of watts needid to

78. Math

Caroline says to Jed, "If you insult me one more time, I am going to slap you!" Jed replies, "That's OK, Caroline. If I don't insult you, you will be able to slap me anyway." If p=you insult me one more time and q=I am going to slap you Explain briefly,

79. math

A 12 cm by 12 cm ice cube tray is in the shape of a cuboid with twelve hemispheres inset. The depth of each hemispheres is 1 cm. a) If all the hemispheres were filled with water, calculate the total volume of water that the ice cube tray could hold. It is

80. math

A 12 cm by 12 cm ice cube tray is in the shape of a cuboid with twelve hemispheres inset. The depth of each hemispheres is 1 cm. a) If all the hemispheres were filled with water, calculate the total volume of water that the ice cube tray could hold. It is

81. Math

A 12 cm by 12 cm ice cube tray is in the shape of a cuboid with twelve hemispheres inset. The depth of each hemispheres is 1 cm. a) If all the hemispheres were filled with water, calculate the total volume of water that the ice cube tray could hold. It is

82. math

10t-640/t^2 = 0 Thank you so much for huge help:)))

83. LECTRICAL ENGINEERING

WHAT IS THE FORMULAR FOR CALCULATING THERMAL ENERGY WHEN GIVEN CURRENT,VOLTAGE,TIME,TEMPERATURE

84. Physics

A bullet whose mass is 0.0015kg leaves a 5kg leaves a 5kg rifle at a muzzle velocity of 800 m/s. It strikes a 7kg block of wood and becomes embedded in it. After the bullet hits the rock, what is the speed of the bullet/ block system?

85. math

The graph of the function f(x)=2^x/a passes through the points (0,b) and (2,0.8). Calculate the values of a and b. Thank you so much for huge help:)))

86. physics

Suppose that it takes exactly 17.0 hr to drain a container of 6.20 liters of water. What is the average mass flow rate (in kilograms/second) of water from the container? Assume that the density (mass/volume) of water is exactly 1 g/cm^3.

87. agriculture

what are the important features of a building which could be used as a milking shed(parlour),dairy(milk room) and food store to ensure production of clean fresh milk?

88. agriculture

outline and explain the objectives of fencing a farmland

89. Maths

In a quadratic sequence.....Term 2 is 11,Term 4 is -7,term 7 is -64....determin the general term for the sequence

90. Maths-financial

Ted needs to take out a loan to buy a new bicycle.He is able to repay the loan by means of 15 semi-annual payments of R2500,starting in 6months from now,when interest is 16% p.a compounded quartely.Calculate the amount of the loan

91. Maths

Determine how long in years it will take the value of a motor vehicle to decrease to 25% of its original value if the rate of depreciation based on the reducing balance method is 21% per annum?

92. finance

Given: WACC= 12%, NPV=+1,491.39, IRR=14.87378%, your all-equity firm has 5,000 common shares outstanding, and the cash flows are: CF0= -18,000, CF1= 3,000 CF2= 3,000, CF3=7,000, CF4?, CF5= 10,000. What is the cash flow at time-point 4.

93. geometry

Find the surface area of pyramid that has a regular hexagonal base od edge 6 cm and a height of 8 cm. Thank you so much

94. geometry

Find the surface area of pyramid that has a regular hexagonal base od edge 6 cm and a height of 8 cm. Thank you so much

95. chemistry

What would happen if chlorine water was added to an aqueous solution of sodium chloride?

96. Chem.

Using condensed electron configurations, give reactions showing the formation of the common ions of the following elements. (Type your answers in the following order. In the first box enter your answer using the format [Ar] 4s2 3d10 4p2 for [Ar]4s23d104p2.

97. Physical Science

What steps should we use to prevent the soil from eroding while we are letting the soil dry?

98. Writing

I am writing an intro paragraph for comparing and contrasting private schools and public schools. NEED HELP!!

99. Math

using each digit 0-9 exactly once to complete addition problem where answer is four digits.