# carly

Newest questions and responses by carly
1. ## math

How do I factor 9x^2 - 49? I believe this is a difference of squares, but I'm not sure how to do it with the 9 in front of the first term.......

2. ## math

How can you tell if a function is quadratic? Just if the highest power is 2? Are there any other ways?

3. ## math

If you're looking at a set of data, how can you tell whether a linear or exponential line of best fit would be most appropriate for the data?

4. ## math

What is the connection between the solutions of the equation ax^2 + bx + c = 0 and the x intercepts of the graph f(x) = ax^2 + bx + c? I'm confused here - aren't they the same thing except one is the equation of a quadratic equation and one is a graph? So

5. ## math

I'm trying to multiply this and keep getting the wrong answer: (x - 5)(-0.025x + 220) I have used the FOIL method and I have multiplied (x - 5) -0.025x and then multiplied (x - 5) 220. Both methods I get the same answer. But... the answer book and the

6. ## math

Try as I might, I just don't understand the difference between inductive and deductive reasoning. I have tried reading about it and they keep talking about general and specific things but I just don't get it. Is there an easy, lay way to explain it so I

7. ## math

How do I find the x intercepts of the function f(x) = -6x^2 + 2700x - 63,750 I know the y has to = 0, but I'm not sure how to solve for x.... Thank you.

8. ## math

2p - 4p < _ -2 that is less than or equal to because I don't know how to make the symbol on my computer Then I get -2p < _ -2 Divide both sides by -2 to get p > _ 1 Is that correct, that when you divide by a negative number the sign changes direction??

9. ## math

What is the difference between the correlation coefficient and residuals when talking about the line of best fit? With the correlation coefficient, I know you want your number to be close to 1 or -1. So when talking about residuals, what is considered a

10. ## math

I am learning about lines of best fit and how to do them on my calculator. I found the correct equation and now I need to find predicted values for x. I have all my x values and I have my equation. Do I need to do each of these manually on my calculator,

11. ## math

I have to answer the question: "why are inequalities a more realistic way to model situations than equations" and am having trouble with this. One reason I thought about is because inequalities are more applicable to real life situations. But other than

12. ## math

Write the equation of the line that passes through the points (3, -2) and (-2, 8) using the slope-intercept form. My slope is -2 So if I substitute in one of the points, -2 = -2(3) + b -2 = -6 + b Add 6 to both sides and b = 4 So my equation is: y = -2x +

13. ## math

I am to solve this inequality: 2/3x < -12 I multiplied both sides by 3/2 to get x < -12(3/2) x < -18 But the answer shows x < -9 What have I done wrong?

14. ## math

I need to recreate a graph in Excel but don't know how to get started. I know how to make graphs in Excel, that's not the problem, I just don't know how to do this one. I can see the what this one is supposed to look like, and from the answers, there are

15. ## math

When writing an equation in point-slope format, is it not proper to fully solve for y? For example, here is my problem: Find the point-slope equation for a line containing the point (-7, 2) and the slope m = 3. The answer was this: y – 2 = 3(x + 7) I was

16. ## math

How do I solve for F here? Solve C = 5/9(F-32) for F

17. ## math

I need to solve a literal equation -- Solve for h: A = 1/2bh If I divide both sides by 2b, then my answer would be h = A/2b Is this correct?

18. ## math

Why does an account with linear growth and a steady increase of \$700 each month have a changing relative difference while an account with exponential growth and a steady 3% increase each month have a steady relative difference of 5% each month?

19. ## math

16. Assume that there are 20,000 runners in the New York City Marathon. Each runner runs a distance of 26 miles. If you add together the total number of miles for all the runners, how many times around the globe would the marathon runners have gone?

20. ## math

I know that theoretical probability observes how may outcomes are possible and assumes that each outcome is as likely as any other to occur and empirical probability is based on actual facts or experiments. So theoretical is what we expect to happen and

21. ## math

I am asked to plot points on a coordinate system and then state what quadrant they are in. If I have a point such as (4,0), which is right on the line), what quadrant is that in? What about (0, -8)? That one is right on the line also. Thank you.

22. ## math

One of the guest rooms in my house has two walls that are 15'6" by 8 ft, and two that are 12'3" by 8 ft. When buying paint for the walls, I estimated the wall area to be about 450 sq. ft. Find my percent area. First I need to find the total area of the

23. ## Math

Given the regular decagon what is the measure of each numbered angle? There is a one in the first triangle, a three in the second, and a two in the sixth triangle in the decagon. Here are the answer choices m1=72, m2=18, m3=36 m1=18, m2=36, m3=72 m1=36,

24. ## math

This was a question asked yesterday that I am stuck on also -- could you explain how to solve this using this "log" on the calculator please? I'm working on a problem where I was given a table and had to find the exponential equation of best fit. The table

25. ## math

I'm trying to factor a problem and cannot seem to get it to work out --- 12a^3 + 10a^2 - 8a I first factored out the gcf of 2 to get 2a(6a^2 + 5a - 4) From there I keep coming up with answers that are incorrect when I check them -- any suggestions please?

26. ## math

After a dog or cat is given a preventive flea medicine, the medicine begins to break down in the animal’s bloodstream. With each passing hour, there is less active medicine in the blood. a. Complete the table and then draw a graph to show the amount of

27. ## math

I'm working on a math project about a track and field olympic event. The question is, is the relationship between the years and time values linear or exponential? So I selected an event and I can see that as the years have passed, the time has decreased,

28. ## math

I'm still working on my car project and wondering if you could check this- this question says: If x represents the number of months and P represents the total paid for the car, write a formula that describes the total amount you have spent on the down

29. ## math

I'm working on a project about buying a new car. It says: A common bit of financial wisdom is that a car payment should be no more than 20% of your monthly take-home pay. Set up and solve an equation to determine how much you would need to be making in

30. ## math

John is buying floor tile to put in a room that is 10 ft by 15 ft. He has chosen tiles that are 18 in by 18 in. Assuming that he needs to buy 10% extra to be safe, how many tiles would he need to buy. I know that I need to buy enough for 150 square feet,

31. ## math

I'm working on a Venn diagram - would you please check my work? The question is: A group of 95 respondents said they regularly watch Netflix, 60 said they watch Hulu, 20 said they watch neither Netflix or Hulu, and 35 said they watch both Netflix and Hulu.

32. ## Math

Suppose that D + E = A, that N/A = 0.18 and that D/A = 0.85 . Solve for N/E.

33. ## math

I need to get a better understanding about relative difference. Do you know of any websites that would have practice problems that I could go to? Thank you.

34. ## math

I'm working on conversions and can't ever figure out when I need to multiply and when I need to divide. For example - 50L = ? gal I know 3.79 L = 1 gal but do I divide or multiple to get the correct answer? Or, 2 mi = ? m I know 1 m = 3.28 ft and 5280 ft =

35. ## math

is 8square root 2 + 2square root 2 equal to 10square root 2? Sorry, I don't know how to type that on my computer. So 8 next to the square root symbol with 2 underneath it + 2 next to the square root symbol with 2 underneath it. I'm thinking those are like

36. ## math

I have an equation of P=(170-3x)(x-25) How do I determine the y-intercept I know I can determine the x intercepts by setting x = to zero, so those are easy to find, but I'm not sure how to find the y-intercept. Thank you.

37. ## Math - Steve

I posted this question yesterday that you answered, so thank you, but how do I put this in my calculator to get this answer? If the exponential equation of best fit is y= 2.9046(1.9798)^x, when will the population be more than 13 million? How would I

38. ## math

If the exponential equation of best fit is y= 2.9046(1.9798)^x, when will the population be more than 13 million? How would I figure this out? I already determined the population in 30 days was 2,299,989,909 which is quite far from 13 million, but that

39. ## math

I have a table and was given an equation of best fit - the table is about the growing US population. My equation of best fit is y = 106.7236(1.0124)^x I found my y intercept and the population in 2013. Now it is asking when will the US population break 400

40. ## math

I'm having a little trouble solving inverse variation. I have four problems - 2 are solved using proportions, 2 are not --- why can they not all be solved using proportions? 1. y varies inversely with x. If y = 40 when x = 16, find x when y = -5 If I use a

41. ## math

When someone says write an exponential equation, what kind of format is that? I know a linear equation is y = mx + b, but what is an exponential equation?

42. ## math

If I have an equation, q(x) = x, and I have to identify what the graph of that would look like, isn't it just going to be a straight line? There are two straight lines to choose from -- one is horizontal across the x-axis on the 1, and the other is

43. ## math

In the correlation coefficient, what is the difference between r^2 and r? I know the correlation coefficient is r, and to find r you take the square root of r^2, but why do they show r^2?

44. ## math

I accidentally deleted the L2 column on my TI-84 calculator - is there a way to get it back on? Currently it goes L1 to L3

45. ## math

How do I find the y-intercept from a table? I know if the table has the x value as 0, and it gives the y value, then that is the y intercept coordinates. But I'm talking about if it doesn't show a zero value for x. So for example, if my table is something

46. ## math

I have two questions: If I have a table such as: Elevation Temperature in 1000 of ft in degrees Fahrenheit 4 73 5 69.5 6 60 So I have found the slope to be -3.5 and the y-intercept to be (0,87) The equation of my line is y = -3.5x + 87 1) Is the left

47. ## Math

I posted this question yesterday but did not get a response so am posting again in hopes that I will get a response today. I am asking for someone to check my answers. The table shows the cost of renting a full-size rental car, based on the number of miles

48. ## math

I'm wondering if someone could check my work please? I have a table: Distance driven in miles Total Cost 0

49. ## Maths

Two ships leave from the same port. One ship travels on a bearing of 157 degrees at 20 knots. The second ship travels on a bearing of 247 degrees at 35 knots. (1 knot is a speed of 1 nautical mile per hour). Calculate the bearing of the second ship from

50. ## Maths

A gift box is made from a rectangular piece of cardboard that is three times as long as it is wide. 5 cm squares are cut from each corner and the ends are then folded up to make the box. If the box's volume is 4340 cm^3, find the length and width of the

51. ## Math

Mr Barkley has a box of books. He says the number of books in the box is divisible by 2,3,4,5 and 6. How many books could be in the box? Add another condition to the number of so that there is only one possible solution.

52. ## Mathematics question

A zoo keeper weighed some of the animals at Melbourne Zoo. He found that the lion weighs 90 kg more than the leopard, and the tiger weighs 50 kg less than the lion. Altogether the three animals weigh 310 kg. How much does the lion weigh? (A) 180 kg (B) 150

53. ## British Literature

Can Someone Please Help Me With My British Lit questions? I have been looking for help everywhere :( Anybody?

54. ## math

Would you please help/check my answers on these probability questions because I cannot come up with what the answer book says. A group of baseball fans at a sports bar in Illinois were asked about which professional baseball team they root for during

55. ## math

Why is -4^2 -16, not 16? To me, -4 * -4 = 16 because a negative times a negative equals a positive. I understand -(4)^2 being negative but not without the parentheses. Thank you.

56. ## Math

We are learning about linear and exponential growth and simple and compound interest. How do I know if I use .02 if my growth rate is 2% or if I use 1.02? What is the difference if I have the 1 in front? I'm a little confused about that. Thank you.

57. ## Chemistry

How many moles of magnesium nitride form when 1.0 mole of magnesium reacts completely?

58. ## math

The area of a circle of radius r is Ï€r^2, which happens to be 1/2r times the circumference 2Ï€r. Explain why this relationship should be expected.

59. ## Health

1. In a soccer game, the coach of the home team realizes her players are not as highly skilled as the other team and she wishes to avoid a high scoring game which she believes her team will not win. How can she apply coaching tactics to give her team the

60. ## Health

At the mall, John and three of his friends are waiting for the movie to start. One of his friends has an older brother who says he can get them all into the movie for free if they go around to the back of the building and come in through the employee

61. ## math

The air pressure at sea level is generally about 1013 hPa (hectoPascals). For every kilometer that you go up in elevation, the air pressure decreases by 12%. Write an equation that describes the air pressure when the elevation is x kilmoeters above the sea

62. ## Math

Considering linear, quadratic, and exponential lines of best fit: If you're studying a set of data, how can you decide which of those three types of model would be most appropriate for the data?

63. ## math

A manufacturer has determined that if it sets the price of paper at x dollars per ream, then its monthly profit can be represented by the equation P = (6000 - 400x)(x - 2). Determine the y-intercept and explain what it means. The teacher said that the

64. ## math

Find the initial amount given an exponential function. Given the equation y = 24(0.77)^t, what is the initial amount? To find the initial amount, I need to replace t with 0. When I do that, I get y = 24(0.77)^0 which is y = 24(1), so y = 24 In doing other

65. ## Math

The producer of a 30 minute tv documentary about world war 1 divided it into two parts. four times as much program time was devoted to the causes of the war as to the outcome. how long is each part of the documentary?

66. ## math

What is the connection between the solutions of the equation ax^2 + bx + c = 0 and the x intercepts of the graph of f(x) = ax^2 + bx + c? The solution says: The solutions of the equation are the first coordinates of the x intercepts. I did the solutions to

67. ## science

tom is marking the locations of active volcanoes on a world map. how the locations of the volcanoes are related to earths plats.

68. ## Math

Solving system of equations by substitution. 52. {5x-2/4+1/2=3y+2/2;7y+3/3=x/2+7/3

A manufacturer has determined that if it sets the price of paper at x dollars per ream, then its monthly profit can be represented by the equation P = (6000 - 400x)(x - 2). Determine the y-intercept - I multiplied it out and found that the y-intercept was

My profit formula is P = -.005x^2 + 4x - 200. The question wants me to find the number of donuts sold (what they are talking about in the problem) that will generate the highest profit. How do I determine that? Thank you.

71. ## math

Hi, I'm trying to learn factoring but a couple of things don't make sense to me and I'm hoping you could explain them. If I have P(x) = 2(x-3)(x-4), how do I automatically know that the zeros are x = 3 and x =4? If inside the parentheses it was (x+3)(x+4),

72. ## math

I'm sorry, but I am asking this question again because the response I received was a question that I could not answer - that's why I am asking here. Thank you. If someone asked: what can we learn from analyzing the standard deviation of a set of data that

73. ## math

If someone asked: what can we learn from analyzing the standard deviation of a set of data that we couldn't learn from just looking at the measures of average, how would I answer? I know that average is the value or number in the middle of the data set and

74. ## math

The number of days, d, it takes for a construction crew to repave a certain road varies inversely as the number of workers, w, that work on the project. So my equation is d = k/w If w = 16, how do I find d? d = k/16 Also, why is Y = 2x^2 + 3√x not a

75. ## MATH

Hi, I'm trying to understand what a quadratic equation is. I understand that in a quadratic equation you have to have a variable in the second power. Why, then, aren't y = x^2 + 2x^3 and Y = 2x^2 + 3 times the square root of x quadratic equations? They

76. ## math

We are learning about the empirical rule - is that the same thing as the bell curve?

77. ## math

When a situation can be modeled by a linear equation, what information do you need in order to find an equation?

78. ## MATH HELP

Monica stepped outside and began to think how fast she is moving even when she is standing still. Assume that the earth is a sphere with a radius of 3960 miles and Monica is at a latitude of 13∘N. What is Monica's speed due solely to the rotation of the

79. ## math

I'm really struggling with the concept of direct variation and indirect variation. Is there an easy way to explain it and understand it?

80. ## math

I need to come up with some ideas of things that have interesting linear relationships. I understand that a linear relationship is something that has a straight line, so is growing or declining at a constant amount every time period, or mile, or whatever,

81. ## math

Hi, When I'm making a graph, how do I know what scale to use? I often struggle with this. Does the origin always have to start at 0? But then I don't know what intervals to use. Is there a rule of thumb? I'm referring to things like scatter plots and

82. ## math

When you are solving inequalities, when does the sign change and when does it not? For example, in -4x -5 > 8 I know I add 5 to both sides, then I have -4x > 13 Divide both sides by -4 and it becomes x < -3.25 But WHY does the direction of the sign change?

83. ## math

If the Red Sox have 14 fans, the Pirates have 42 fans, and the Phillies have 25 fans, what is the probability that a randomly selected fan is not a Red Sox fan? The total number of fans is 81, so I believe it would be 42 + 25 = 67/81 which is 82.7%.

84. ## english

some spectators in the back row of the rodeo jeered at the clowns after the last event.

85. ## Math - Excel

Hi, I need to write an Excel formula and I am trying to double check my work. We are asked to find the difference and relative difference for this account. So the values are: \$10,000 \$10,700 \$11,400 \$12,100 \$12,800 \$13,500 etc. The difference for each is

86. ## math

hello, I am to calculate a model length of a boat and a car. The boat's true length is 17 feet and the car's true length is 20 feet. The model will be on a 1:16 scale. Could you tell me how I get started with this please?

87. ## Math

If each small square on a grand chest board is 2 cm x 2 cm and the diagonal on the whole board measures square root of 800 cm. How many small squares are on the board?

88. ## math

Could you please explain why, when increasing something, you put a 1 in front of it? For example, if something is increased by 5%, why do you multiply by 1.05? What exactly does that 1 mean or represent? Thank you.

89. ## math

A lawyer drives from her home, located 6 miles east and 10 miles north of the town courthouse, to her office, located 4 miles west and 14 miles south of the courthouse. Find the distance between the lawyer's home and her office. I know the answer is 26

90. ## math/stats

A hamburger chain found that 65% of all customers use mustard, when they buy hamburgers. If 5 customers randomly selected, what is the probability that none use mustard?

91. ## algebra

if you toss a coin and roll a number cube, what is the probability that the coin shows tails and the number cube shows 4?

92. ## chemistry

I don't understand the difference between endothermic and exothermic?

93. ## Math

Find all points on the x-axis of a Cartesian coordinate system that are 20 units from the point (0,12) The point (0,12) would just be 12 points up on the y axis, so wouldn't I just count 20 spaces to the left and right so it would be (20, 12) and (-20,

94. ## math

How would I go about solving this problem? (-6x^6)(-6x^2x^6)

95. ## Math

I'm really struggling with this -- I have different table configurations - straight line, L-shaped, plus sign-shaped, and T-shaped. Suppose there are n tables arranged in these patterns. I need to write an expression of the number of tables with 2 chairs.

96. ## Math

1. Use the associative property to rewrite the expression 97 + (3 + 13) I rewrote this as (97 + 3) + 13 since the associative property is about changing the grouping. The answer in the back of the book says 97 + (3 + 13) -- the same as the original

97. ## math

When determining the slope of a line, what is the correct way to leave the answer? For example, my problem is: Find the slope of the line passing through (-7,9) and (5, -7) After subtracting the y's and the x's,I know the slope is -4/3, but do I leave the

98. ## Math

We are adding positive and negative numbers. The question is State positive or negative or it depends along with my answers. Are these correct? Positive + positive: positive Positive + negative: it depends Negative + negative: negative Positive –

99. ## Math

1. What is the distance between the points (1, 4) and (4, 8)? I said Distance = 5 2. Find the slope between (1, 4) and (4, 8) I said 4/3 3. Are the expressions (4x+4)/4 and x+1 equivalent? I said Yes 4. Simplify (x+y)2 x2 + 2xy + y2 5. Is (x – y )2 = x2