Most popular questions and responses by Mack
  1. math help please check my answer

    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°

    asked on April 23, 2017

    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

    asked on March 3, 2015
  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

    asked on February 20, 2019
  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

    asked on March 15, 2007
  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

    asked on August 9, 2007
  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

    asked on May 20, 2007
  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

    asked on April 29, 2007
  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

    asked on April 20, 2007
  9. Environmental Science

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

    asked on April 20, 2007
  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

    asked on June 20, 2018
  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

    asked on April 3, 2007
  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

    asked on April 20, 2007
  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

    asked on July 11, 2013
  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.

    asked on March 18, 2007
  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

    asked on March 28, 2007
  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???

    asked on April 29, 2007
  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?

    asked on April 8, 2015
  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

    asked on August 9, 2007
  19. science

    Flight simulators are used to train new pilots because ____.

    asked on April 9, 2015
  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 +

    asked on June 27, 2007
  21. Science

    What are the advantages of slower population growth? Please check your assigned reading and post your answer. We'll be glad to help you when we see your thoughts about this subject. No diseases and over crowd True. But a society can provide food, jobs, and

    asked on March 18, 2007
  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

    asked on August 27, 2007
  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

    asked on April 20, 2007
  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

    asked on February 4, 2012
  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)

    asked on October 14, 2007
  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

    asked on September 25, 2007
  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!!

    asked on May 11, 2012
  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

    asked on August 27, 2007
  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?

    asked on September 22, 2014
  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?

    asked on March 24, 2011
  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

    asked on April 20, 2007
  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?

    asked on February 18, 2008
  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. I would say

    asked on April 29, 2007
  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

    asked on March 18, 2007
  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?

    asked on September 3, 2011
  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?

    asked on April 12, 2007
  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

    asked on April 27, 2007
  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

    asked on April 27, 2007
  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

    asked on April 20, 2007
  40. Environmental Science

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

    asked on April 20, 2007
  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.

    asked on March 25, 2007
  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?

    asked on January 20, 2014
  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?

    asked on November 19, 2011
  44. Social Studies

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

    asked on November 20, 2014
  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

    asked on April 29, 2007
  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

    asked on March 18, 2007
  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.

    asked on October 14, 2019
  48. EMERGENCY!!!


    asked on November 19, 2007
  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

    asked on June 26, 2007
  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:

    asked on April 20, 2007
  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.

    asked on April 20, 2007
  52. Environmental Science

    How is fresh water used in industry? manufacturing processes the disposal of waste products 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

    asked on April 20, 2007
  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

    asked on March 18, 2007
  54. chemistry

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

    asked on June 16, 2011
  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

    asked on December 6, 2010
  56. Environmental Science

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

    asked on April 20, 2007
  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

    asked on March 18, 2007
  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

    asked on February 18, 2007
  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

    asked on November 19, 2011
  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

    asked on August 9, 2007
  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

    asked on June 26, 2007
  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

    asked on April 20, 2007
  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

    asked on March 18, 2007
  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.

    asked on February 19, 2007
  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

    asked on September 12, 2017
  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

    asked on December 4, 2011
  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

    asked on August 10, 2010
  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.

    asked on August 5, 2007
  69. history

    on the 1st page can someone please help me??????? Its the 2nd and 3rd black dot next to my nasme. Even if this is a repost, more information needs to be given before we can adequately respond. Please repost with more information. Thanks for asking.

    asked on April 29, 2007
  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.

    asked on April 29, 2007
  71. history

    The precedent that Marbury v. Madison set was a lawsuit right?

    asked on April 27, 2007
  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

    asked on April 26, 2007
  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

    asked on April 21, 2007
  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

    asked on April 20, 2007
  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

    asked on March 25, 2007
  76. Science

    Type one and Type three survivorship curves indicate populations that are growing _______________. Please check your assigned reading and post your answer. We'll be glad to help you when we see your thoughts about this subject. fast? fast?

    asked on March 18, 2007
  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 will not be

    asked on March 18, 2007
  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)

    asked on March 18, 2007
  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

    asked on November 19, 2011
  80. Trig

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

    asked on April 28, 2011
  81. English 4

    what are the steps in writing a good essay?

    asked on February 9, 2008
  82. African Amer. Study

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

    asked on January 29, 2008
  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?

    asked on January 29, 2008

    Can soneone please help me where it says Hearing Loss/Causes

    asked on December 11, 2007
  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

    asked on December 6, 2007
  86. African American History

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

    asked on October 11, 2007
  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?

    asked on August 27, 2007
  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

    asked on June 26, 2007
  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

    asked on April 29, 2007
  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,

    asked on April 26, 2007
  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

    asked on April 20, 2007
  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.

    asked on April 3, 2007
  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.,_1824 2.

    asked on March 25, 2007
  94. Science

    A ___________ helps demographers predict which age groups will experience the most growth. Please check your assigned reading and post your answer. We'll be glad to help you when we see your thoughts about this subject. telescope? A telescope is used to

    asked on March 18, 2007
  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".

    asked on March 18, 2007
  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.

    asked on January 31, 2016
  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

    asked on October 12, 2014
  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

    asked on March 20, 2012
  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?

    asked on October 22, 2007
  100. English 4

    I need a summary of the story Medea.

    asked on October 22, 2007


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