Lina

Most popular questions and responses by Lina
1. Math

What does it mean to get a 150% salary raise?

2. Physics

A pilot flying low and slow drops a weight; it takes 2.8 s to hit the ground, during which it travels a horizontal distance of 100 m . Now the pilot does a run at the same height but twice the speed. How much time does it take the weight to hit the ground?

3. Physics

A cork gun contains a spring whose spring constant is 18.0 N/m. The spring is compressed by a distance ∆X = 6.0 cm and used to propel a cork of mass 7.66 g from the gun. Assuming the cork is released when the spring passes through its equilibrium

4. Algebra

The general equation for depreciation is given by y = A(1 – r)t, where y = current value, A = original cost, r = rate of depreciation, and t = time, in years. A car was purchased 6 years ago for \$25,000. If the annual depreciation rate is 11%, which

5. MATH

A carpenter has a board that is 10 feet long. He wants to make 6 table legs that are all the same length. What is the longest each leg can be? Thanks

6. chemistry

A gas is confined to a container with a massless piston at the top. (Part C figure) A massless wire is attached to the piston. When an external pressure of 2.00 atm is applied to the wire, the gas compresses from 4.90 to 2.45 L. When the external pressure

7. Tcc

What are the magnitudes of (a) the angular velocity, (b) the radial acceleration, and (c) the tangential acceleration of a spaceship taking a circular turn of radius 3220 km at a speed of 29000 km/h?

8. Algebra

A type of plant is introduced into an ecosystem and quickly begins to take over. A scientist counts the number of plants after m months and develops the equation p(m)=19.3(1.089) raised to m, to model the situation. Most recently, the scientist counted 138

9. english

in robert frosts poem birches the lines you many see their trunks arching in the woods years afterwords training their leaves on the ground like girls on hands and knees that throw their hair ue which two poetic devices?

2-Eric and Frank want to equally share 4/3 feet of rope. what length of rope should each friend get? Explain how to use a drawing to help solve the problem.

11. US History

Which region of this map was ceded by France to the United States? North Northeast *** South and southeast West The picture shows West Florida in the middle, the Gulf of Mexico below it, part of some other states near the sides and top.

12. math

How many faces, edges, and vertices does the solid figure have? image

13. Algebra

An equation for the depreciation of a car is given by y = A(1 – r)t , where y = current value of the car, A = original cost, r = rate of depreciation, and t = time, in years. The value of a car is half what it originally cost. The rate of depreciation is

14. math

Which equation has the complex number 4-3i as a root? 1) x^2+6x-25=0 2) x^2-6x+25=0 3) x^2+8x-25=0 4) x^2-8x+25=0 Can anyone please teach me how to do it?THANKS A LOT!!!

15. Maths

1. In the xy-coordinate plane, point A is the midpoint of the segment with endpoints (2,4) and (-4,-4). What is the distance from point A to the origin? I know how to find the distance between the two points- 10. But I don't know where to go from there. 2.

16. CHEM HELP ANYONE ASAP

Arrange the members of the following set of cations in order of increasing ionic radii: Sr2+ Ba2+ Rb+ K+ I understand that Sr2+ = 132 pm Ba2+ = 149 pm Rb+ = 166 pm K+ = 152 pm increasing ionic radii ....Sr2+ , Ba2+ , K+, Rb+ But the its not going in online

17. Physics

The mass of an astronaut is 72kg. (a) what is his weight on earth ( taking g to be 10N/kg) ? (b) if the astronaut is on the moon's surface where the acceleration due to gravity is one-sixth on the earth , calculate (I) the mass (ii) the weight of the

18. Statistics

8.11) For the manufacturing plant discussed in Exercise 8.10, the union president and the human resources director jointly select a simple random sample of 36 employees to engage in a discussion with regard to the company’s work rules and overtime

19. Math

Explain how you would convert a measurement given in ounces into pints

20. Economic

in the early 1980s when the Polish people had to stand in long lines to purchase most consumer goods, the government ordered that every third place in line be reserved for pregnant women or disabled persons. this was presumably done to reduce their

21. chem

Calculate the ph of a buffer solution that is 0.10M in ammonia and 0.15M in ammonium chloride .kb for ammonia is 1.8*10^-5

22. Simple Probability Question

A small manufacturing company has rated 80% of its employees as satisfactory and 20% as unsatisfactory . Personnel records show that 75% of the satisfactory workers had previous work experience in the job they are now doing, while 30% of the unsatisfactory

23. Math

A monument consists of two cubical blocks of granite, the smaller resting on the larger. The total height of the monument is 5 feet, and the area of the exposed surface is 61 square feet. Find the dimensions of the blocks. Help please>.< Thank you in

24. Chemistry

How will the equilibrium: Heat energy + CH4 + 2H2S = CS2 + 4H2 be affected by the following? a) A decrease in temperature? b) The addition of H2 c) The removal of some CH4 d) An increase in the volume of the container e) The addiotion of a catalyst. i know

25. physiC

A uniform door (0.81 m wide and 2.1 m high) weighs 150 N and is hung on two hinges that fasten the long left side of the door to a vertical wall. The hinges are 1.9 m apart. Assume that the lower hinge bears all the weight of the door. Determine the

26. Statistics

For the manufacturing plant discussed in Exercise 8.10, the union president and the human resources director jointly select a simple random sample of 36 employees to engage in a discussion with regard to the company’s work rules and overtime policies.

27. physics

A figure skater glides along a circular path of radius 4.70 m. (a) If she coasts around one fourth of the circle, find the magnitude of the displacement vector. m (b) If she coasts around one fourth of the circle, find what distance she skated. m (c) What

28. Maths..

Uh...Yea... Sorry about this, but I"m trying to study and I need someone to walk me through, missed a lot of school. fyi, when there's a / its under the entire string before it until you hit the inequality symbol. Tony Bowled 135 and 145 in his first two

29. Math

Ryan bought 2 1/4 pounds of almonds and divided them into bags with 1/8 pound in each bag.

30. Math

If 2 gulps = 5 slurps, and 2 slurps = 7 sips, then 35 sips is equal to how many gulps?

31. chemistry

What volume of oxygen(in Liters) at 25 degrees C and 1.05 atm is needed to completely combust 2.65L of methane, measured at STP

32. Geometry

Write a two column proof. Given: angle STV is congruent to angle TVU, angle STU is congruent to angle UVS. Prove: Angle SVT is congruent to angle UTV.

33. math

if the product of five tenths and three tenths is subtracted from the sum of two tenths and six tenths what is the difference

34. Physics

Also got lost on this question: A rescue plane wants to drop supplies to isolated mountain climbers on a rocky ridge 235m below. If the plane is traveling horizontally with a speed of 250 km/h (69.4 m/s), (a) how far in advance of the recipients

35. Algebra

A passenger boat which travels 6 mph faster than a freighter required 3 days less time to make a trip of 2592 miles. Find the rate of the passenger boat.

36. Physics

A mass M = 40.0 kg is suspended by a massless string from the ceiling of a van which is moving with constant acceleration a, as shown in the figure. If the string makes an angle theta = 21° with respect to the vertical, what is the acceleration a of the

37. Micro Economics

A nation's production possibilities curve is "bowed out" from the origin because a. resources are not equally efficient in producing every good c. resources are scarce d. wants are virtually unlimited . John has a paper route and spends all his weekly

38. Algebra

Calvin deposits \$400 in a savings account that accrues 5% interest compounded monthly. After c years, Calvin has \$658.80. Makayla deposits \$300 in a different savings account that accrues 6% interest compounded quarterly. After m years, Makayla has

39. Chemistry for Engineers

A gas is confined to a container with a massless piston at the top. (Part C figure) A massless wire is attached to the piston. When an external pressure of 2.00 atm is applied to the wire, the gas compresses from 4.90 to 2.45 L. When the external pressure

40. Physics

A particle P travels with constant speed in a circle of radius 7.3 m and completes one revolution in 34.0 s (see Figure). The particle passes through O at t = 0 s. What is the magnitude of the average velocity during the interval from t = 11.9 s and t =

41. Physics

A cork gun contains a spring whose spring constant is 18.0 N/m. The spring is compressed by a distance ∆X = 6.0 cm and used to propel a cork of mass 7.66 g from the gun. Assuming the cork is released when the spring passes through its equilibrium

42. pre-calculus

Rewrite the expression so that it involves the sum or difference of only constants and sines and cosine to the 1st power (sinx)^4

43. Math

A sport arena covers 710,430 square feet of ground. A newspaper reported that the arena covets about 700,000 square feet of ground. To what place value was the number rounded?

44. accounting

rigoberto invests 8,000 at 6% interest, compound semiannually for 1 year

45. Math

Tim ate some chocolate cake for an afternoon snack He left 3/4 of the cake. If his parents ate 1/3 of the remaining cake for dinner, write a multplication problem to represent how much cake tims parentd ate

46. physics!!! Damon?

The graph at the right is a positive vs. Time graph for the motion of an object moving along a horizontal (x) axis For each of the 8 1-second time intervals, describe the displacement, instantaneous velocity (+/- and whether the velocity is increasing or

47. physics

Your spaceship lands on an unknown planet. To determine the local value of g, you ask a steel-toed crew member to kick a stone, and you find that if she kicks it at 18.0m/s at various angles, the maximum range she can achieve is 30.8m. What is g on this

48. Chem

2. Suppose a chemistry student made 2000. mL of 6.00 M HCl. He accidently spilled half of this solution on the floor. What is the Molarity of HCL left in the beaker? Explain the answer... - for this problem, would I use the eq'N, M1V1=M2V2. 3. What is the

49. pre-calculus

use a sum or difference formula to find the exact of the trigonometric function cos(-13pi/12)

50. Statistics

city law enforcement has state that 20% of items sold by paywn within city stolen john purchase 4 items from city pawn shop for x=the number of john purchase that have been stolen how I can determine:a P(x=0, b P(2

51. Social Studies

What is a sentence that explains how the terms tributary and drainage basin are related

52. Math

Oliver has one juice box. Lucy has one fewer juice box than oliver. How many juice boxes does lucy have?

53. Maths

|a|-3/4=-5/8 a. 1/8 or -1/8 b. 7/8 or -7/8 c. 1 3/8 or -1 3/8 d. No solution could someone walk me through perhaps? I missed a ton of class.....So did Fae.

54. math

The length of a rectangle is 3 m more than double the width, and the area of the rectangle is 54 m^2. Find the dimensions of the rectangle.

55. child development

(Penn Foster) 1- Neueon development and elaboration, which occurs between birth and age 10, is prompted by: A -aural prompts from the famiy school and environment. B-physical movement on the part of the child C- Intake of foods rich in vitamins and

56. Science

I forgot my book in my desk and have homework over the weekend!! HELP ME!

The Eatery Restaurant has 200 tables. On a recent evening, there were reservations for 1/10 of the tables. How many tables were reserved?

A total revenue function is given by R(x) = 1000(x^2 - 0.1x)^1/2 , where R(x) is the total revenue, in thousands of dollars, from the sale of x items. Find the rate at which total revenue is changing when 20 items have been sold.

Where was the site of the Battle of Fort Sumter in the Civil War? Thanks!

Can a secondary consumer be eaten by another secondary consumer? Thanks! :-)

Hi I need help with my math problem. It is: Name the function rule from the table given. Table- X= Y= -4 4 -2 2 0 0 answers: y = -x y = -4 y = 2x y = x I do not get how to solve this problem!

62. biochemistry

Calculate the pH change of 10mL of HCl added to 1M phosphate buffer in 1L with initil pH of 7.2?

63. statistics

A researcher has observed independent samples of females and males, recording how long each person took to complete his or her shopping at a local mall. The respective times, in minutes, are listed in file. Using the 0.025 level of significance in a

64. statistics

Please only the formula and steps to do this problem. Thank you An assembly process includes a torque wrench device that automatically tightens compressor housing bolts; the device has a known process standard deviation of ó = 3 lb-ft in the torque

65. statistics

Please only the formula and step I need for this problem. thank you In response to media inquiries and concerns expressed by groups opposed to violence, the president of a university with over 25,000 students has agreed to survey a simply random sample of

66. physics

A steel beam is used in the construction of a skyscraper. By what fraction (change in L)/(Lo) does the length of the beam increase when the temperature changes from that on a cold winter day (-15 F) to that on a summer day (+105 F)? Can anyone please give

67. Math

Write your answer in standard form. Show all your work if you want to be eligible for partial credit. Write the equation of a line perpendicular to the line y = (2/3)x - 7 and passing through the point (4,-2). The slope of the line y = (2/3)x - 7 is 2/3.

Marty had 316 keys and Nick had 541 keys. After both of them lost the same number of keys, Nick had 6 times as many keys as Marty. How many keys did each of them lose?

69. Math

Jon's test grades are 76,84,83 and 78.What does he need to make on his next test to have an 83 average?

70. Physics

Calculate the thermal energy required to convert 5kg of ice at 0 Celsius to steam at 100 Celsius

71. physics

A student stands at the edge of a cliff and throws a stone horizontally over the edge with a speed of 22.0 m/s. The cliff is h = 38.0 m above a flat horizontal beach, as shown in the figure below. How long after being released does the stone strike the

72. Physics

I did the problem but i'm confused on what to do next: 1.A hunter aims directly at a target (on the same level) 120m away. (a) If the bullet leaves the gun at a speed of 250m/s, by how much will it miss the target? (b) At what angle should the gun be aimed

73. Chemistry Really Confused!!

'm confused on how to set up the problem for each question.. 1.) Calculate the empirical formula of a compound if a 6.21 g sample contains 1.67g of cerium and the remainder iodine 2.) An unknown compound contains 85.64% carbon with the remainder hydrogen.

74. Chemistry

I'm confused on how to set up the problem for each question.. 1.) Calculate the empirical formula of a compound if a 6.21 g sample contains 1.67g of cerium and the remainder iodine 2.) An unknown compound contains 85.64% carbon with the remainder hydrogen.

75. Socials

How did the building of the transcontinental railway benefit the country? I know that First Nations were kicked off their farmland to make way for the building of the railway and for settlers(why would settlers need the land?). Why was the railway so

76. ALGEBRA

perimeter = 24 feet triangle that have one side is b =? second side is b =? third side is b - 3 =? How to solve this problem?

77. math

write the direct variation equation for the following:y varies directly with x and y=60 when x=10

78. math

If r = 12.5 and s = |−13|, which of the following inequalities is not true??? 1.r≠s 2.r< s 3.r≥s 4.r≤s

79. Physics

A long solenoid ( radius = 1.8 cm) has a current of a 0.33 A in its winding. A long wire carrying a current of 22 A is parallel to and 1.2 cm from the axis of the solenoid. What is the magnitude of the resulting magnetic field at a point on the axis of the

80. geometry

A rectangular garden 10m * 18m . Find the area of a sidewalk that is 2m from the side of a garden ?

81. Physics

A lift is pulled up to the top of a building by a constant force of 6400N at a constant speed of 2m/s. It takes 3mins to reach the top. (a) how much work is done in raising the lift to the top of the building ? (b) what is the power required ?

82. Health, Safety, and Nutrition (Penn Foster)

Health, Safety, and Nutrition 1. Today in class you’re going to talk to your students about Vitamin C and what it does for a person’s body. From which one of the following food groups should you select your snack for today? A. Bread, cereal, rice, and

83. physics

A man stands on the roof of a 19.0 m-tall building and throws a rock with a velocity of magnitude 30.0 m/sat an angle of 42.0 degrees above the horizontal. You can ignore air resistance. Calculate the maximum height above the roof reached by the rock.

84. physics [vectors]

The concept i get, but somehow i just can't execute this problem, please help me! You are given vectors A = 5.5 6.2 and B = - 3.7 7.4 . A third vector C lies in the xy-plane. Vector C is perpendicular to vector A and the scalar product of C with B is 19.0.

85. statistics

Please, give the formula and steps to do this problem. Thank you The average length of a flight by regional airlines in the United States has been reported as 299 miles. If a simple random sample of 30 flights by regional airlines If The average length of

86. Math

What would be considered as a competitive interest rate and was is a compeititve interest rate?

87. Math

14 2 7 3 9=10 insert symbols to make it work 9*2 11 8 4 1=60

88. Math

If a, b, and c are three integers in geometric progression, prove that the number a^2+b^2+c^2 is exactly divisible by the number a+b+c.

89. Physics

A particle P travels with constant speed in a circle of radius 7.3 m and completes one revolution in 34.0 s (see Figure). The particle passes through O at t = 0 s. What is the magnitude of the average velocity during the interval from t = 11.9 s and t =

90. chemistry

the molar mass of NaOH is 40g/mol, how many grams ofNaOH are required to yield 0.65 mol?

91. math

oliver can jog about 3 times as fast as he can walk. If his average walking rate is one mile in 20 minutes, about how far could he jog in 2 hours?

92. Chemistry

Kinetic energy = 1/2 mv^2 where m is the mass of the particle and v is the velocity of the particle. A joule is the SI unit for energy and is kg.m^2/s^2. Find the energy in joules of a 56.7 g mass moving at the speed of 70. km. hr.

93. Physics

A long solenoid ( radius = 1.8 cm) has a current of a 0.33 A in its winding. A long wire carrying a current of 22 A is parallel to and 1.2 cm from the axis of the solenoid. What is the magnitude of the resulting magnetic field at a point on the axis of the

94. Physics

A long solenoid ( radius = 1.8 cm) has a current of a 0.33 A in its winding. A long wire carrying a current of 22 A is parallel to and 1.2 cm from the axis of the solenoid. What is the magnitude of the resulting magnetic field at a point on the axis of the

95. Physics

A long solenoid ( radius = 1.8 cm) has a current of a 0.33 A in its winding. A long wire carrying a current of 22 A is parallel to and 1.2 cm from the axis of the solenoid. What is the magnitude of the resulting magnetic field at a point on the axis of the

96. Physics

A long solenoid ( radius = 1.8 cm) has a current of a 0.33 A in its winding. A long wire carrying a current of 22 A is parallel to and 1.2 cm from the axis of the solenoid. What is the magnitude of the resulting magnetic field at a point on the axis of the

97. Maths SUPER URGENT

Hey What size down pipe would I need, and how many if my roof area equals 1224.78 metres squared and I have average rainfall of 173kl per year? Also how much plumbing would I need from my hypothetical tanks?

98. world history

Which of the following was the first known king of Mesopotamia? A. Sargon B. Lipit-Ishtar C. Hammurabi D. Gilgamesh

I need help figuring out this on a food web. It goes from a flower to a butterfly to a frog to the bird to a coyote. Now I have to label them. I got them all however i do not know what the frog and bird is. HELP!! :-)