# Mack

Most popular questions and responses by Mack

A roofer is standing on the roof of a house 60 ft above the ground. His truck is parked 25 ft from the house. What is the angle of depression from the roofer to his truck? Round to the nearest whole degree. 22° 23° 67° 68°

2. ## CHEMISTRY

Using a 0.20 M phosphate buffer with a pH of 6.5, you add 0.72 mL of 0.46 M NaOH to 58 mL of the buffer. What is the new pH of the solution? (Enter your answer to three significant figures.) I don't even know where to begin!! I just need a set up of the

3. ## Chemistry

13.A student mixed 5.00 g (0.0594 mol) of solid cyclohexane, C6H12, (84.18 g mol–1) at its melting temperature of 6.6°C with 50.0 g (0.594 mol) of liquid cyclohexane at 50.0°C in an open yet insulated container. After thermal equilibrium was

4. ## Enviormental Science ( Human Population)

I need to find the missing word. An icrease in population could result from increased birth rate, increased __________, or immigration. Increased birthrates and immigration account for an increase in population. Decreased death rates also account for an

5. ## Math

A positive integer n is defined as a "prime interlude" if n-1 and n+1 are both prime numbers. Which of the following is not a "prime interlude?" a.4 b.18 c.30 d.72 e.90 ( First of all; What is a "prime interlude??") I don't understand the question and

6. ## Math

3,5,-5... The first term in the sequence of #'s shown above is 3. Each even # term is 2 more than the previous term and each odd # term, after the first, is -1 times the previous term. For example, the second term is 3+2, and the third term is (-1)x5. What

7. ## history

How did the Louisiana Purchase affect the size of the U.S? Look at a map of the purchase; then look at the number of square miles that was added and the number of states that were made out of the purchase. so it shortening it? """"so it got

8. ## Environmental Science

Could you please explain the distinction between eutrophication and artifical eutrophication sense eutrophication is the natural process by which a body of water gains an abundance of nutrients? One is natural and occured long before man's time. The other

9. ## Environmental Science

Name another cause of artificial eutrophication. (Is it bar b queing?)

10. ## Physics

A 15kg box is resting on a hill forming an angle with the horizontal. The coefficient of static friction for the box on the surface is 0.45. Calculate the maximum angle of the incline before the box starts to move. Steps included would be great, I have the

11. ## Geomentry

What is the converse of the theorem statement: If a line parallel to one side of a triangle intersects the other two sides, then it divides the two sides proportionally. If two sides of a triangle are divided in the same proportion, then the line

12. ## Environmental Science

Ninety seven percent of the world's water resources are found in a.fresh water b.salt water c.icecaps and glaciers d.groundwater This is my Science test that i got back from my Science teacher. My grade is a 69 0n it. She told me to work and check on it

13. ## Math

An object is projected vertically upward from the top of a building with an initial velocity of 144 ft/sec. Its distance s(t) in feet above the ground after t seconds is given by the function s(t) = −16t2 + 144t + 120. A) Find its maximum distance above

14. ## Science

[I need help finding the missing words] An increase in population could result from increased birth rate, increased _____________, or immigration. Increased life span.

15. ## Geomentry

I have to use a # line to find the ratio of the segment lengths. BD:CF point B is on the # 2. point D is on the # 9. point C is on the # 6, and point F is on the # 13. (How did they arrive with a answer of 1\1?) From B to D is 2 to 9, or 7. From C to F is

16. ## history

Why did Massachusetts Federalists support Republican Aaron Burr for governor of N.Y in the 1804 election? Please tell us your answer -- and we can discuss it. Because he had power bECAUSE HE HAD pOWER???

17. ## Physics

A spinning wheel is slowed down by a brake, giving it a constant angular acceleration of −4.60 rad/s2. During a 2.60-s time interval, the wheel rotates through 85.4 rad. What is the angular speed of the wheel at the end of the 2.60-s interval?

18. ## Math

Which of the following is a prime #? a.2 b.19 c.37 d.51 e.67 I choose 2. But the book answer is 51. The book says:( 2,19,37, and 67 are prime #'s) 3x17=51, so it is not prime. I forgot what prime #'s mean that's why I choose anything like 2. help me. A

19. ## science

Flight simulators are used to train new pilots because ____.

20. ## math

Elizabeth earns a weekly salary of \$165 plus a 10% commission on sales. Find her total income for a week when her total sales were \$2800. They got \$445. How did they get that and what is commissions? \$165 + 10% of \$2800 is the answer. Do the numbers. 165 +

22. ## S.A.T Math

At Central Park Zoo,the ratio of sea lions to penguins is 4 to 11. If there are 84 more penguins than sea lions, how many sea lions are there? The answer book says: C is the answer. The correct answer should yield a ratio of sea lions to Penguins of 4 to

23. ## Environmental Science

Many areas of the world that do not have adequate fresh water have become habitable because a.rainfall patterns have changed b.water management projects have diverted water to the areas c.icebergs have been towed in to provide fresh water d.people have

24. ## statistics

A company markets educational software products, and is ready to place three new products on the market. Past experience has shown that for this particular software, the chance of "success" is 80%. Assume that the probability of success is independent for

25. ## African Amer. Study

The Middle Passage Why was the mortality rate so high? Explain the term seasoning. Explain the term triangle slave routes. How long did the voyage take? (on a regular ship)

26. ## physics

I need a plan to solve this problem and I'm stuck. Please help. A basketball laeaves a player's hands at a height of 2.10m above the floor. The basket is 2.60m above the floor. The player shoots the ball at a 38.5 degree angle. If the shot is made from a

27. ## Math

Each fence section has a post at each end. How many posts are needed to build a fence with 10 sections? Is it 8, 11, 10 or 9 posts ?? Please explain to really want to understand this!!

28. ## S.A.T Math

I do not understand This: Employee x is paid \$12.50 an hour for the first 36 hours he works in a week, and is paid double that rate for every hour over that. Employee Y is paid \$15.00 an hour for the first 40 hours she works in a week, and is paid 1.5

29. ## Math

A circus performer walks on a tightrope 25 ft above the ground. The tightrope is supported by two beams and two support cables. If the distance between each beam and base of its support cable is 15 ft, what is the length of the support cable?

30. ## Algebra

Ameter stick casts a shadow 1.4 m long at the same time a flagpole casts a shadow 7.7 m long. The triangle formed by the meterstick and its shadow is similar to the triangle formed by the flagpole and its shadow. How tall is the flagpole?

31. ## Environmental Science

Most of the oil that pollutes the ocean comes from a.operating boats and personal watercraft b.spills from oil tankers c.runoff from cities and towns d.leaking underground storage facilities I picked d. That made sense to me. something that is leaking from

32. ## American Sign Language

What is a asl classifier for President? What is a asl classifier for woman? What is a asl classifier for letter? What is a asl classifer for brother?

33. ## history

What were the 2 most valued possessions of the pioneers that owned the conestoga wagon? You may be able to find your answer in this site, although I didn't see anything about most valued possessions. http://www.answers.com/topic/conestoga-wagon I would say

34. ## Science

What groups of organisms are most in danger of extinction? [I'm not to sure. I think it's c.] a.Those with small populations b.those that migrate or need special habitats d.both (a) and (b) Since you didn't put C down, I don't have any idea as to what the

35. ## physic

A football is kicked stright up into the air it hits the ground in 4.6 sec later, what was the greatest height reached?

36. ## history

"Upon what principle is it that the slaves shall be computed in the representation? Are they men? Then make them citizens and let them vote. Are they property? Why then is no other property included" - Gouverneur Morris What is the meaning of this quote?

37. ## history

What are 5 ways that Jefferson and Republicans simplified Government? Which Republicans are you refering to? The Democratic-Republican Party of Jefferson or the Republican Party of Lincoln? Jefferson Jefferson

38. ## history

can some one check my work? i can where is it It's the one with the one that says order the sequence. Hi! brie. My work is on the 2nd page. Count the BLACK dots next to everybody's name until you find the 35th dot. Check that work. You'll see it next to my

39. ## Environmental Science

I need help trying to figure out what the main idea of the passage is because I don't really understand it. The natural process of eutrophication is accelerated when inorganic plant nutrients, such as phosphorus and nitrogen, enter the watr from sewage and

40. ## Environmental Science

What is the purpose of adding alum to water during the water treatment process? a.to filter and remove large organisms and trash b.to form flocs that bacteria and other impurities will cling to c.to prevent bacterial growth d.to remove unwanted gases I

41. ## history

In 1860 what concerns were brought about during Lincoln's Presidency? The attempt of the South to secede from the Union was the main convern. This erupted into the Civil War one year later, when Union forces were attacked at Fort Sumter, South Carolina.

42. ## math (fractions)

Three people share a sum of money. The first receives 2/7 and the second receives a 2/5 share of the money. What fracion does the third receive?

43. ## physics

the centers of two 5000 kg blocks are separated by 1.13 m. What is the gravitational force between the two blocks? What must be the distance between the centers of the blocks if the gravitational force decreases 25 times?

44. ## Social Studies

What did Clinton mean by "a dear bought victory, another such would have ruined us"

45. ## history

What vital right did the Spanish allow the Western farmers? Answer: It was that Spain allowed Americans to travel on the lower Mississippi to New Orleans and to ship their goods. "cORRECT right??" mmhmm Can you help me out with this one???? Did you ever

46. ## Science

[I choose b.] Why are there so many species still unknown to modern science? a.many of these species are found in remote environments. b.smaller species receive less attention than large organisms. c.Cataloging these species is a huge task d.all the above

47. ## physics

A man can throw a ball a maximum horizontal distance of 142 m. The acceleration of gravity is 9.8 m/s 2 . How far can he throw the same ball vertically upward with the same initial speed? Answer in units of m.

48. ## EMERGENCY!!!

HELLO! I DON'T KNOW WHAT'S GOING ON WITH ME LEFT HAND. MY PINKY IS SWOLLEN AND I HAVE NO IDEA WHY MY PINKY IS SWOLLEN. I DON'T REMEMBER INJURING MY LEFT HAND OR MY PINKY IN ANY WAY TODAY AND NONE THIS PAST WEEEK. WHEN I BEND MY PINKY I FEEL NUMNESS AND

49. ## math

I forgot how to add and subtract mixed # fractions. How do you do it? ex) 3/7+5/6=1 11/42- How did they get this answer?? ex) 5 6/13-2 8/13=2 11/13- How did they get this answer?? ex) 3/7+5/6=1 11/42 You need to find a common denominator when adding or

50. ## Environmental Science

Here is a sentence that says: In bodies of water polluted by phosphorus, algae can form large floating mats, called algal blooms. What substance causes an alfal bloom to form? (I don't understand the sentence) That's "algal bloom" See:

51. ## Environmental Science

Which of the following is a source of point pollution? a.unlined landfill b.runoff from city streets c.precipitation containing air pollution d.runoff from farms d Yep, it is d.

52. ## Environmental Science

How is fresh water used in industry? a.in manufacturing processes b.in the disposal of waste products c.to generate power d.all of the above i picked b. I'm no expert on environmental science, but wouldn't it be (d)? I thought that because: a. People use

53. ## Science

What's the vocabulary word for the definition (activities such as camping in wilderness areas) Surely you have a list of words to choose from. THere are many words or phrases that fit these words, but which is your vocabulary word? Only you have access to

54. ## chemistry

what products would be formed if glycerol were combusted? wright a balanced equation for the combuntion reaction of glycerol (C3,H8,O3).

55. ## Statistics

The mean serum cholesterol level in the population of males who do not develop heart disease is known to be 219 mg/100 ml. Suppose you perform a study to investigate whether the mean serum cholesterol levels in males who do develop heart disease is higher

56. ## Environmental Science

A hole that is dug into the ground to obtain fresh water is called a.the recharge zone b.a well c.an aquifer d.a watershed a. right? I don't agree with that... re check Try http://www.answers.com and look up each term. Then let us know what you think the

57. ## Science

Where are many critical biodiversity hotspots located? a.cities and developed areas of the world b.islands,tropical rain forests, and coastal areas c.desert and polar environments d.all the above [I picked d.] I wont disagree with you. So is d the

58. ## history

what are the two towns near boston that in 1775 the first battles of the american revolution fought in? See below. =) Whatis the answer? you said see below but there's no answer. Writeacher wants you to look at the Wikipedia website that she linked in her

59. ## Physics

A 160g stone, tied to a thread, swings in a horizontal circle with a 100 cm diameter. if the maximum tension the thread can withstand before snapping is 28 N, find the A) Maximum speed of the stone B) Acceleration of the stone at this speed. I solved A

60. ## math

what does over time and time in a half mean? Employees who earn an hourly wage can only work 40 hours a week. When they work more hours a week, that's considered overtime. By federal law, employees who work overtime are entitled to 1 1/2 times (time and a

61. ## Math

75 mg of salt is equivalent to how many grams of salt? They got 0.075. How did they arrive at that answer? A milogram (mg) is 1/1000 of a gram. In other words, each gram contains 1000 milograms. To convert from mg to grams, divide the mg by 1000. In this

62. ## Environmental Science

Here is another part of my test that my teacher told me to check. Could you please help me check them? Write the letter of the term or phrase that best matches the description. Mississippi River- I picked b.recharge zone. area above an aquifer- Ipicked

63. ## Science

How might an improvement in a country's educational opportunities lead to a decrease in its birth rate? Educated people, especially women, don't usually have a lot of children. They don't need a lot of children to make sure some survive or to have enough

64. ## history

What are whe 3 general areas where the was was fought in the Revolutionary War? This site will give you some good ideas. However, I would say the major battles were in the northern US, on the sea and to a lesser extent in the southern US.

65. ## Physics

2 Dimensional Motion-Kinematics QS 1: An airplane wishes to travel 800 km northeast of a starting point. There is a wind blow towards the east at 100km/h. Assuming the maximum speed of the plane in still air is 500km/h, a: what course should the pilot

66. ## physics

A 500g ball is dropped into a well that is 10m deep. A)What is the ball's potential energy before it is dropped? Take the bottom of the well to be at zero height. I solved by using PE=mgh and came up with 49J. B) What are the kinetic energy and potential

67. ## economics

1. Use the following information to answer the questions below: Quantities Produced Prices CDs Tennis Racquets CDs Tennis Racquets Year 2004 100 200 20 110 Year 2005 120 210 22 120 a. Calculate real GDP using prices from 2004. By what percent did real GDP

68. ## math

What is a better way to remember your timed tables? Is there a game or a song you can go by or something? These websites have games and many ways to practice the times tables. http://www.woodlands-junior.kent.sch.uk/maths/timestable/index.html

70. ## history

Can someone please check my answers? I have to put the sequence in order that the events happened. 9.The Lewis and Clark expedition leaves st.louis 8.thomas jefferson authorizes robert livingston to offer \$10million for new orleans and west flordia.

71. ## history

The precedent that Marbury v. Madison set was a lawsuit right? http://en.wikipedia.org/wiki/Marbury_v._Madison

72. ## history

What set up regional courts for the U,S with 16 judges and other officials? You are posting a lot of questions. Try this: Post with it your thinking, we will be happy to critique. Marbury v. Madison Marbury v. Madison No Marbury vs Madison was the concept

73. ## Environmental Science

What is another cause of artificial eutrophication? Since you haven't told us what other causes are, it's impossible for us to find "another cause." Please tell us the causes you've found -- and we'll try to help you. fertilizer from farms, lawns, and

74. ## Environmental Science

Polluted groundwater is difficult to clean up because a.groundwater is deep in the ground and dispersed through large areas of rock. b.pollutants cling to the materials that make up the aquifer and contaminate the clean water c.the recycling process of

75. ## history

What does this quote mean? Who does it refer to? and What kind of government does it refer to? Thank you for using the Jiskha Homework Help Forum. You need to type the quote so we may see it! Otherwise we can't help you. "A government responsive to the

77. ## Science

[I choose a.] Preserving entire ecosystems rather than individual species is a good conservation strategy because a.only endangered species will be saved b.developers will have greater access to land c.more than one species can be saved d.it will not be

78. ## Science

[I choose c.] It is often difficult to save individual species because a.small populations are more prone to disease b.inbreeding may result in genetic disorders c.captive species may not reproduce in the wild. d.all the above. I would say (d)

79. ## physics

A ball weighing 1.78 N is shot through a launcher, achieving a speed ( from rest) of 41 m/s in 0.28 s. A) What is the mass of the ball? B) What is the acceleration of the ball as it moves through the launcher? C) What average force acted on the ball to

80. ## Trig

What is the vertical asymptote of y=tan(x-pi/3)?

81. ## English 4

what are the steps in writing a good essay?

82. ## African Amer. Study

Who was the first women to address male audience in Public?

83. ## African Amer. Study

Who's rebellion came first? Gabriel,Nat Turner,Denmark Vesey or Charles Deslande. I choose Nat Turner for 1, Charles Deslande for 3, Denmark Vesey for 2,and Gabriel for 4. My teacher marked it all wrong. What did I do wrong?

85. ## Hearing Loss/Causes

I need websites on these Questions: How does a buildup of earwax cause someone to have a hearing loss? What happens when there is hearing loss in the inner ear? What are some reasons that a person may have a hearing loss in the outer or middle ear? What is

86. ## African American History

The Middle Passage What did the Explorer Bartholomeau Dias discover? Why was the mortality rate so high?

87. ## Math

Let's say I work in a store and a costmer walks up to me and asks me how much are a pair of head phones. And I say \$3.80. Let's say the custumer gave me \$5.00. How much change will I give back to the custumr?

88. ## Math

they wanted me to choose an equivalent measure for 150 centimeters and they got 1500mm. How did they arrive at the answer?? There are 10 milimeters (mm) in each centimeter (cm). By multiplying 10 times 150, we get the number of mm in 150 cm -- 1500 mm. I

89. ## history

Which one matches??? k. because of his urging, the election of 1800 was finally settled L. set up regional courts for the U.S with 16 judges and other officials. I. claim by an Adams appointee to force the delivery of his commission. F. appointed chief

90. ## history

Is it because of James Madisons urging, the election of 1800 was finally settled? or was it someone else? Election of 1800 Connecticut, Delaware, Georgia, Kentucky, Maryland, Massachusetts, New Hampshire New Jersey, New York, North Carolina, Pennsylvania,

91. ## Environmental Science

Which of the following is one way that a person can conserve water? a.Take a bath instead of a shower b.Wash laundry in small, partial loads c.use a low flow shower head to take short showers d.water the lawn daily and at nidday. I picked a. right? Because

92. ## Geomentry

What is the converse of the theorem statement: If a line divides two sides of a triangle proportionally, then it is parallel to the third side. see the other post.

93. ## history

What happens in the elections of 1824? Thank you for using the Jiskha Homework Help Forum. I would not say "what happens" but rather "what happened." Here are some links for you: 1. http://en.wikipedia.org/wiki/United_States_presidential_election,_1824 2.

95. ## Science

What's the vocabulary word for the definition of (threatened areas of high biodiversity) This site may help you with that. (Broken Link Removed) That may also be called an ecological "hotspot".

96. ## MATH

A TAXI CAB COST \$1.25 FOR THE FIRST MILE AND \$.25 FOR EACH ADDDITIONAL MILE. how many miles can be traveled in the taxi for \$8.00? M= number of miles traveled.

97. ## engineering science N4

A steel block is resting on a Flat plank 6m long ,and how high can one end of a plank be lifted For the block to start to move,if the coeficient of friction is 0.3

98. ## alg 1 college

can you guys please help me wwith a math problem, its asking to solve this equatoion, sqare root5x-4=3x-18. to fkire off first 5x-4= 3x-18 squared. foil thatand you are looking AT 9x squared -54x -54x+324/ add the -54 to 108x.then shoot the 5x to to the

99. ## African Amer. Study

On Chapter 3 "Black People In Colonial North America 1526-1763," What happened in 1663? What happened in 1694? What were the list of codes that controlled the activities of slaves?