luckybee

Most popular questions and responses by luckybee
1. algebra/functions

a farmer has 600 meters of fencing and plans to use it to build two adjacent rectangular pens as show above. the farmer would like the total area of the two pens to be 1000 square meters. write an equation to determine the value of x? My solution is: 3X^2

2. geometry

a packaging company manufactures a cardboard box with a volume of 864 cubic inches. the length of the box is 24 inches, and the ends of the box are square. what is the height of the box in inches?

3. geometry

to estimate the number of daises in a field students toss a ball into the field and mark a circular region with a radius of 15 feet from where the ball landed. the students then counted 35 daises in the circular region. if the entire field is approximately

4. math gre question

in an infinite series of circles the radius of the second circle is one half the radius of the first circle and the radius of the third circle is one half the radius of the second circle. if the first circle has a radius of one inch which of the following

5. statistics

A sudent is analyzing data from an experiment using a linear model. when the student entered the data into his calculator and ran a least squares linear regression the calculator gave a correlation coefficient of 0.01. what can the student infer from this

6. chemistry 2411

A high-protein diet contains 71g of carbohydrate, 150 g of protein, and 5.0 g of fat. How many kilocalories does this diet provide? (Round the final answers to the nearest tens place.)

7. gre math prob of a sample

sample standard deviation = 3 sample mean = 68 n=30 what is the probability that one student selected at random from the sample will have a height within one sample standard deviation of the sample mean? a. 1.00 b. 0.73 c. 0.57 d. 0.23

8. math working backwards

Sandra spent one-fifth of her money and loaned one-third of the remainder to her brother. She had \$24 left. How much did she begin with?

9. algebra/functions

Dave started his coin collection with 25 coins. the first wee he added 2 coins, the next week he added 4 coins, and the third wee he added 6 coins. If Dave continues adding coins in the same way, how many coins will he have in his collection after one year

10. geometry

A manufacturer wants to package samples of a product in a box with a square base. the package is to have a volume of 100 cubic centimeters. what is the func that will describe the surface area of the box S(x) in ters of the length of a side of the base, X?

11. statistics

A group is studying age distribution of people living in town. The mean age is 45, the modal age is 59, the median age is 56, the range is 96, and the standard deviation is 20.5. Is the data positively or negatively skewed

12. parallell and perpendicular lines

please check my homework given P(7,2) and the line y + 3x=7 find the equation for the line parallel line: y+3x+7 y=-3(x-7) +7 y-2=-3x+21+7 y=-3x+28+2 y=-3x+30 perpendicular line: y-2=1/3(x-7) +7 y-2=1/3x-7/3 +21/3 y-2==1/3x + 14 y=1/3x + 14 +2 y=1/3x +16

13. math gre ques

A sudent is analyzing data from an experiment using a linear model. when the student entered the data into his calculator and ran a least squares linear regression the calculator gave a correlation coefficient of 0.01. what can the student infer from this

14. college problem solving 3

an express train leaves new york at 3:00 pm and rreaches boston at 6:00 pm a slow train leaves boston at 1:30pm and arrives in new york at 6:00 pm. if both trains travel at constant speeds at what time do they meet

15. algebra system of equations

solve X^2 + Y^2 =70 Y= 2X + 5

16. algebra

a tank used to operate equipment can be filled with air in 3 hours. when the outlet valve is open, the same tank can be emptied in 5 hours. if the tank is filled with the outlet valve open approximately how long will it take to fill the tank? 71/2 hours.

17. algebra

what is the graph of 6X^2+6X-12>0? My solution is: an open circle over -2 going to infinite an open circle over +1 going to infinite is this correct?

18. system of equations

X^2 + Y^2 =70 Y = 2X + 5 MY ANSWER: -5.6, 1.6 is this correct?

19. algebra/functions

a quadractic function y=3x^2-6x+5 is expressed in the form (y-k)= A(x-h)^2, where the poing (h,k) is the vertex of the parobla. What are the value of h and k? (1,2) is this correct?

20. Algebra

A radio tower is supported by a wire fastened to the ground 60 feet away from the base of the tower. If the slope of the wire is 3/2 approximately how long is the wire

21. function with a radical expression

f(x)=6 fx)=20+2x^2 all under a square root symbol 6=20+2(36) 6=the square root of 92 will someone help me

22. algebra/functions

recent estimates indicate that the area covered by glaciers has decreased from over 25.5 km^2 in 1850 to about 16.6 km^2 in 1995. Let A=f(t) give the area t years after 2000, and assume that f(t)=16.2-0.062t. How much glacier area disappears in 15 years?

23. math gre study ques

a student starts with a positive number, x^6, and take the square root three times and the cube root once. this is equivalent to which of the following? a. x^1/4 b. x^4/3 c. x^3/4 d. x^4

24. Trig

the horizontal speed of an airplane is 183mph. the magnitude of the plane's velocity is 200mph. write an expression describing the angle the angle the plane is climbing my solution: cos-1 183/200 is this right

25. statistics

one of six radios in a crate is known to be defective. the radios are tested one at a time. if the first two radios are not defective, what is the probability that the third radio tested is defective.

26. statistics

a weather girl predicts there is a 50% chance of rain and a 10% chance that the rain will turn into snow. What is the probability that it will snow?

27. college problem solving 2

Me and Bill said casey can do the job for you in 10 days but give me alex instead of bill and we can get it done in 9 days. i can do better tha that said slex. let me take bill as a partner and we will do the job for you in 8 days. how long will it take

When you have 3 separate circles and the radius of each of those circles is 10 do i calculate like this? 2(10)+2(10)+2(10)=60 cm for my diameter

29. chemistry 211 Lamar Univ

Calculate the number of SO_2 molecules in 9.19 moles of SO_2

30. logic

a student is using a geometry program to investigate the midsegments of a triangle. the student uses the program to draw triangle ABC, bisect the sides of the triangle, and draw segments connecting the midpoints to form triangle KLM. the student then uses

31. logic

1+3=4=2^2 1+3+5=9=3^2 1+3+5+7=16=4^2 is this an example of inductive or deductive reasoning. I believe it is deductive because it's proven

32. geometry

a packaging company manufactures a cardboard box with a volume of 864 cubic inches. the length of the box is 24 inches, and the ends of the box are square. what is the height of the box in inches?

33. algebra

marcus rides his bicycle of 3 1/8 hour per day. what is the number of seconds that marcus spends riding his bike each day? My answer: 11,250 is this correct?

34. precalcus will someone check my homework

f(3)=-3/8 and (f-2)=-12 MY SOLUTION F(-2)=ab^-2 = -12 F( 3)=ab^ 3 = -3/8 b^5 = 12 * 3/8 = 32 b=2 12 = a(2)^2 12 = 4a a =3 f(x)=3(2)^x

35. algebra

give the general formulas for the integer solutions of x^2 + y^2 = z^2. what is x,y, and z when m=18 and n=11

36. algebra equation

give the general formulas for the integer solutions of x^2 + y^2 = z^2. what is x,y, and z when me=18 and n=11

37. statistics

a point is randomly selected within the rectangle with vertices at (2,0), (2,2), (-4,2), and (4,0). What is the probability that the point's x-coordinate and y-coordinate are both positive?

38. algebra 2

complete the square 2x^2-4x-1=0

39. physics

if a teacher wanted to demonstrate mass in the classroom, which of the following objects should she use? a ruler or an eraser

40. algebra

how do you solve this equation d/3t + d/4.5(t+1.5) = d

41. college problem solving

a certain two-digit number is 6 less than the sum of its tens digit and 7 times its units digit. if the digits are reversed the number is increase by 27. fin the original two-digit numbers

42. calculating range

calculating the range of 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16 Is the range 16-0 =16

43. closure propery

Is this set closed under multiplication {-1, 0, 1}

44. logic

conjecture 17 if A, B, and C are sets, then (A\B)U C = A\(BUC)

45. trig

using a right triangle with one angle 24 degrees and the opposite side being 57 feet, write an expression to fine the hypotenuse, X? X=57/sin(24) is this correct?

46. probability

a student rolls three standard six-sided dice. what is the probability that the sum of the numbers that come up will be 18? is the answer 1/216

47. trig

a circular chimney pipe with an 8-inch diameter passes vertically from a heater through a metal plate in the roof. the plate has an elliptical hole that measures 8 inches along one axis. if the roof is slanted at an angel of 40 degrees with the horizontal,

48. trig

the horizontal speed of an airplane is 173 miles per hour. the magnitude of the planes velocity is 200 miles per hour. what angle is the plane climbing? My answer is Cos-1 173/200. is this correct

49. pre-calculus

PD= 600(0.978)^t PD is decreasing at 2.2% per year. How did they get 2.2%

50. algebra

V=h[( (a+b)/2)^2 + 1/3( (a-b)/2)^2] showing all steps that it reduces to following: v=h/3(a^2 +ab+b^2)

51. algebra eqution

V=h[( (a+b)/2)^2 + 1/3( (a-b)/2)^2] showing all steps that it reduces to following: v=h/3(a^2 +ab+b^2)

52. algebra/functions

If F is a decreasing function what can you say about F(-2) compared to F(2)?

53. algebra/functions

If G is an increasing function. what can you say about G(3) - G(-1)?

54. stat counting principles

telephone numbers for a certain city have exchanges of 584, 545, or 586. each of these exchanges is followed by four digits. how many different telephone numbers are possible for this city? a. 3 * 4 b. 3 * 4 * 10 c. 3 * 10^4 d. 3 * 4^10

55. alg application

two cars leave the station at 9:00 am. the first car head due south at an avg speed of 54mph. the second car heads due west at an avg speed of 72mph. how far apart will the cars be at 1:00pm? my solution: 360mi is this correct

56. re-post statistics

a weather girl predicts there is a 50% chance of rain and a 10% chance that the rain will turn into snow. What is the probability that it will snow? statistics - Ms. Sue, Friday, January 6, 2012 at 9:08pm What on earth is a "weather girl?" That's what the

57. statistics

how many different license plates can be made consisting of three letters by four digits?

58. statistics

a computer system requires all users to log on using a 6 character password. if each character can be either a digit from 0 to 9 or a letter of the alphabet, what is the number of possible passwords. please show formula used

1. math working backwards

I understand thank you.

posted on September 15, 2013
2. math working backwards

When working backwards we first need to deal with 1/3. so since it says 1/3 of the remainder, does this mean to divide 24 by 1/3

posted on September 14, 2013

I solved it. the length of segment CD with by 20 cm. Thank you

posted on September 14, 2013

There are 3 separate circles, there is a chord drawn through the center of each circle, the point of tangency is on the third circle. So i drew a line perpendicular from the radius of 10 in the third circle to the point of tangency. This is the entire

posted on September 14, 2013
5. gre math prob of a sample

There is a picture of a histogram. the numbers on the x-axis are: 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, and 76. the numbers on the t-axis are: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10. there are additional symbols: sigma x =2100, sigma x^2=142540,

posted on January 11, 2012
6. statistics

I thought order matters in this problem because it says 3 letters then 4 digits. So should nPr be used? 26P3= 15600 10P4 = 5040 (5040)(15600)= 78624000

posted on January 5, 2012