Saturday

September 20, 2014

September 20, 2014

**Branches of Math**

**Recent Math Questions**

Post a New Question | Current Questions

**math**

21. If 6x+4y=40 and 7y/4x=7, what is value of x^2?
*Wednesday, August 20, 2014 at 11:53pm*

**Math**

A restaurant manager lost $415 in business during the month of January. Business picked up in February, and he ended the month with a profit of $1580. What was the managers profit after January and February?
*Wednesday, August 20, 2014 at 11:53pm*

**Math**

Dominic collects sports science fiction and history books. He has 21 books about sports, 35 books about science fiction, and 14 about history. He wants the same number of each type of book on each shelf. What is the greatest number of each type of book on each shelf?
*Wednesday, August 20, 2014 at 10:27pm*

**7th grade Math/Science **

Can you help me with this science question: from sea level, the biosphere goes up about 9km and down about 19km. What is the thickness of the biosphere in meters? (there wasn't a formula in the workbook). Thanks
*Wednesday, August 20, 2014 at 10:14pm*

**Math IV**

what is the margin of error for a simple random sample of 900 people with a standard deviation of 13.5 at 95% level of confidence How do you write this question in the right formula, please? I believe I can calculate the problem, I don't know how to write it. 900 2.5 and 1...
*Wednesday, August 20, 2014 at 10:02pm*

**math**

a submarine dives 10feet per min. for 12min. which expression represents this situation?
*Wednesday, August 20, 2014 at 9:33pm*

**Math**

Which expression is equivalent to (x + 5) • 6?
*Wednesday, August 20, 2014 at 9:14pm*

**Math**

What is the probability of obtaining exactly three heads in four flips of a coin, given that at least two are heads? (Enter the probability as a fraction.) I keep getting 2/3 but its wrong. Help!!
*Wednesday, August 20, 2014 at 8:12pm*

**Math**

What is 225-256dto the 2nd power =?
*Wednesday, August 20, 2014 at 7:59pm*

**math**

5. How many positive integers less than 36 are equal to 4 times an odd integers?
*Wednesday, August 20, 2014 at 5:55pm*

**Math**

Maggie has a ribbon 27 feet long. What is the length of the ribbon in yards?
*Wednesday, August 20, 2014 at 5:46pm*

**math**

9. Three cards are drawn at random from a standard deck of 52 card, without replacement. What is the probability of drawing a 7, drawing a 9, and a king in that order?
*Wednesday, August 20, 2014 at 5:45pm*

**math**

6. In a survey of 100 people, 73 owned only stocks. Six of the people invested in both stocks and bonds. How many people owned bonds only? This is what I did: 73+6=79 100-79=21
*Wednesday, August 20, 2014 at 5:41pm*

**math **

find x if (x,-2) is a solution to the equation 3x+2y=-7. my answer was x=1 but it was wrong.
*Wednesday, August 20, 2014 at 5:03pm*

**math**

Describe the following reflections or translation in words 1.(x,y)--->(x,-y) 2.(x,y)-->(-y,-x) 3.(x,y)-->(x 4,y-4)
*Wednesday, August 20, 2014 at 3:51pm*

**math**

28. If the ratio of a to b is 4 to 5 and the ratio of a to c is 6 to 11, what is the ratio of b to c?
*Wednesday, August 20, 2014 at 3:40pm*

**math**

24. What is least common multiple of 2,3,4,5,6, and 7? This is what I did: 2x3x2x5x2x3x7=2520
*Wednesday, August 20, 2014 at 3:36pm*

**Math**

To construct a copy of an angle ABC, the material that is Not necessary is A.) Protractor B.) Compass C.) Ruler or Straightedge D.) Pencil I think it is A.) Protractor Thank You.
*Wednesday, August 20, 2014 at 3:25pm*

**Math: Please help**

Which of the following must be true about a the bisectors of a segment in a plane? A. Every segment has exactly one bisector. B. Every segment has exactly two bisectors.****** C. Every segment has 10 bisectors. D. Every segment has infinitely many bisectors. I think the right ...
*Wednesday, August 20, 2014 at 2:57pm*

**Math**

The standard deviation of test scores on a certain achievement test Is 11.3. If a random sample of 81 students had a sample score of 74.6 , find a 90% confidence interval estimate for the average score of all students.
*Wednesday, August 20, 2014 at 2:54pm*

**MATH HELP!!**

SID WROTE 541,309 ON HIS PAPER. USING NUMBERS AND WORDS EXPLAIN HOW THE NUMBER WOULD CHANGE IF HE SWITCHED THE DIGITS IN THE HUNDRED THOUSANDS AND TENS PLACES
*Wednesday, August 20, 2014 at 2:46pm*

**math**

A population distribution is known to have standard deviation 20. Determine the p value of a test of the hypothesis that the population mean is equal to 50, if the average of a sample of 64 observations is a) 52.5 , b) 55.0 , c) 57.5
*Wednesday, August 20, 2014 at 2:39pm*

**Math**

Fifty numbers are rounded off to the nearest integer and then summed. If the individual round off errors are uniformly distributed between -0.5 and 0.5 , what is the approximate probability that the resultant sum differs from the exact sum by 3.
*Wednesday, August 20, 2014 at 2:37pm*

**math**

3.The distribution function of a random variable is given by F(x)= {0 , for x<-1 {(x+1)/2 , for -1<x<1 {1 , for x≥1. Find P(3<x<4).
*Wednesday, August 20, 2014 at 2:35pm*

**math**

A circular track is 1000 yards in circumference. Cyclists A, B, and C start at the same place and time, and race around the track at the following rates per minute: A at 700 yards, B at 800 yards, and C at 900 yards. What is the least number of minutes it mus take for all ...
*Wednesday, August 20, 2014 at 2:01pm*

**Math**

Which set of integers are in the right order from least to greatest? A.-8,8,6,|-7|,5 B.|-7|,-8,8,6,5 C.-8,5,6,|-7|,8 D.5,6,8,-8,|-7| Is the answer D?
*Wednesday, August 20, 2014 at 1:16pm*

**math**

On a coordinate system, the segment joining the points (3,8) and (9,16) has the same midpoint as the line segment joining the points (8,11) and (x,13). What is the value of x? I think x=3
*Wednesday, August 20, 2014 at 12:56pm*

**math**

The perimeter of a rectangle farm is 1 whole number 1 over 2 times its breadth.find the lenght and breadth of the farm
*Wednesday, August 20, 2014 at 12:12pm*

**math**

1. A gallon of a certain kind of paint will cover 224 square feet of surface. In painting two walls; one 36’ by 8’ and the other 24’ by 9’, the number of gallons of paint used is: 2. Susan wants to use blue, yellow, green, and pink paint to decorate her ...
*Wednesday, August 20, 2014 at 11:47am*

**math **

the sum of my digits is 13, my hundredths place is 3 less than 5, my ones place is 4 more than 3, my thousands place is even, what 4-digit numbers can I be
*Wednesday, August 20, 2014 at 10:04am*

**math**

Suppose that the 6-month US Treasury bill rate is equal to 5% and the forward rate on a 6-month Treasury bill 6 months from now is 7.24%. (both in yearly terms). What is the rate of a 1-year bill?
*Wednesday, August 20, 2014 at 9:46am*

**math**

Write “$4,915 for 72 shares of stock” as a unit rate. Round to the nearest hundredth if necessary
*Wednesday, August 20, 2014 at 9:39am*

**math**

40+ 20- 28 divided by 7+(30 divided by 5)-3 =
*Wednesday, August 20, 2014 at 9:23am*

**math**

A (yearly) cash flow stream is x=(-40,10,10,10,10,10,10). The spot rates are (yearly in percentage) s=(5.0,5.3,5.6,5.8,6.0,6.1). Use the discount factors to determine the (net) present value of the stream.
*Wednesday, August 20, 2014 at 8:39am*

**math**

are all right angles complementary
*Wednesday, August 20, 2014 at 3:43am*

**Math**

To convert miles per hour to feet per second, which conversion factor would not be used? a. 1 hr/60 min b. 1 min/60 sec c. 5280 ft/1 mi d. 1 mi/5280 ft
*Tuesday, August 19, 2014 at 10:53pm*

**Math**

The circumference of a circle is 4 times the circumference of a circle with a radius 1 unit less. What is the radius of each circle?
*Tuesday, August 19, 2014 at 10:34pm*

**Math**

If the radius of a circle is increased by 1 unit, the area of the circle is increased by 16 pi square units. What is the radius of the original circle?
*Tuesday, August 19, 2014 at 10:06pm*

**math**

What is 1/10 of 200?
*Tuesday, August 19, 2014 at 9:40pm*

**math**

What is 1/10 of 200
*Tuesday, August 19, 2014 at 9:34pm*

**math**

The point (-3,4) is on a circle with its center at the origin. Which of the following points must also be on the circle?
*Tuesday, August 19, 2014 at 9:08pm*

**math**

When p is an odd positive integer, then the graph of the power function f(x)=x^p is similar to the graph of y=??
*Tuesday, August 19, 2014 at 8:52pm*

**math**

58. Let GCF (x,y) represent the greatest common factor of x any y. If p is a positive even integer less than 11, for what value of p does GCF (p^2,81) have the greatest value?
*Tuesday, August 19, 2014 at 8:08pm*

**math**

Evan is painting a stool that has a cylindrical seat and four rectangular prism legs. The seat has a diameter of 10 inches and a height of 3 inches. Each leg is 3 inches by 3 inches by 12 inches. How much area will Evan have to paint. use 3.14 for pi show your work
*Tuesday, August 19, 2014 at 6:21pm*

**math**

if you know that 7* 8=56 , how can you use the commutative (Order) Property of Multiplication to find the product of 8*7 ?
*Tuesday, August 19, 2014 at 5:47pm*

**math**

A printing company determines that to print a large format poster, it costs $75 to set up the production process. Each poster that is printed costs $22 in material and labor. The printing company sells these posters to marketing firms for $60 each. Find a linear model P that ...
*Tuesday, August 19, 2014 at 5:03pm*

**math**

If f(x)=x^2+2 then f(x+h)=???
*Tuesday, August 19, 2014 at 4:56pm*

**math **

the product of my three digits is 30. when you add my ones digit and tens digit together, the sum in my hundreds digit. my ones digit is 3. what number am I
*Tuesday, August 19, 2014 at 4:21pm*

**math STEVE**

Mr. Corbin is a salesman. He gets a 5% commission on all sales between $100 and $500 and a 10% commission on all sales above $500. His commission on sales of $783 was:
*Tuesday, August 19, 2014 at 3:14pm*

**math**

1. Mr. Corbin is a salesman. He gets a 5% commission on all sales between $100 and $500 and a 10% commission on sales of $783 was: 2. Of the students who tried out for the baseball team, 1/8 tried out as catchers, 1/3 as infielders, and 1/4 as outfielders. The fraction of the ...
*Tuesday, August 19, 2014 at 3:05pm*

**math**

52. The mean of twenty numbers is 34. If four of the twenty numbers have a mean of 45, what is the mean of the other sixteen numbers? This is what i did: Is this right? 20x34=680 4x20x45=3600 3600+680/16=267.5 answer:267.5
*Tuesday, August 19, 2014 at 2:43pm*

**math**

47. If x=y-7, hat is the value of 6x-6 in terms of y?
*Tuesday, August 19, 2014 at 2:40pm*

**math**

50. 5 years ago, Jack was six less than twice of Kelly's current age. If Kelly was 20 years old three years ago, how old will be jack in 10 years? This is what I did: I got 55 J=(2k-6)+5 K=23 (2x23-6)+5 =45 45+10=55
*Tuesday, August 19, 2014 at 2:39pm*

**Math**

HELP PLZ !!! Show that the set of points are collinear (a) (-2,-6) (2,-4) and (4,-3) (b) (-5,5) (1,1) and (4,-1) (c) (-5,-6) (-2,0) and (-1,2)
*Tuesday, August 19, 2014 at 2:09pm*

**math**

5/x+7/y=31,7x+5y=29xy by comparision and subsitition method
*Tuesday, August 19, 2014 at 1:36pm*

**math**

Find the mean of these grades:71, 72, 87, 96, 82, 76.
*Tuesday, August 19, 2014 at 12:52pm*

**math**

Find the mean of these grades:71, 72, 87, 96, 82, 76.
*Tuesday, August 19, 2014 at 12:28pm*

**math**

Find the mean of these grades:71, 72, 87, 96, 82, 76.
*Tuesday, August 19, 2014 at 12:22pm*

**math**

Which one is associative? 6(3) + 6(7) = 6(10) or 1/2(8*9)=4*9
*Tuesday, August 19, 2014 at 11:11am*

**math**

A (yearly) cash flow stream is x=(-40,10,10,10,10,10,10). The spot rates are (yearly in percentage) s=(5.0,5.3,5.6,5.8,6.0,6.1). Use the discount factors to determine the (net) present value of the stream. (I got a little confused here. Should I 1. use the running present ...
*Tuesday, August 19, 2014 at 11:08am*

**math**

(-1)^1989-(-)^1988
*Tuesday, August 19, 2014 at 10:42am*

**math**

Starting from today, every month you save $500 into a bank account with earns interest at an annual rate of 4%. How much money do you have in the account at the end of 4 years? My working is F=R(((1+i)^n)-1)-i where R=500, i=1/300 and n=48. Ans=$25,979.80 Am I solving it ...
*Tuesday, August 19, 2014 at 9:40am*

**math**

Find the geometric series whose second term is 1.5 and the fifth term is 0.1875
*Tuesday, August 19, 2014 at 8:32am*

**math**

the area of the rectangular tabletop at the right is 3 square meters. If the width is 0.5 m shorter than the length, what are the dimension of the tableshop?
*Tuesday, August 19, 2014 at 7:57am*

**math**

the area of a rectangular room is 65 m^2. Find the perimeter of the room given that its length is 3 m more than thrice its width
*Tuesday, August 19, 2014 at 7:56am*

**math**

completing the square of x^2-3x-8=0
*Tuesday, August 19, 2014 at 7:23am*

**math**

. A factory employing a large number of workers finds that over a period of time , the average absentees rate is three workers per shift. Calculate the probability that in a given shift (i)exactly two workers will be absent , (ii)more than four workers will be absent .
*Tuesday, August 19, 2014 at 6:56am*

**Math**

Why is life like a shower
*Tuesday, August 19, 2014 at 12:47am*

**Math**

Does 5 round up or down?
*Tuesday, August 19, 2014 at 12:11am*

**4th grade math**

If jill climbed 100 feet more, how many feet above sea level would she be?
*Monday, August 18, 2014 at 11:23pm*

**Math**

A class us planning a party. A pizza restaurant cuts each pizza into 8 slices. There are 32 students. How many pizzas does the class need to order for each student to have a slice? Explain
*Monday, August 18, 2014 at 10:17pm*

**Teaching in Early childhood progras **

Self appraisals should not be used to assess which of the following? A. Math concepts B. Dispositions regarding tasks C. IEP adherence D. Literacy my answer is c.
*Monday, August 18, 2014 at 9:18pm*

**Math**

If a plane flies due north for 70km, then due west for 145km, what would the compass bearing be for the plane from its starting point? Please email me once you have the result at jodie.jebb@moc.sa.edu.au
*Monday, August 18, 2014 at 8:53pm*

**math**

A plane flies 90km on a bearing 030 degree and then flies 150km due east. How far east of the starting point is the plane?
*Monday, August 18, 2014 at 8:48pm*

**math**

the distance between DELHI TO Meerut is 75km two trains speed of 100km/h & 80 km/h leave the two station at 8am towards each other at what time will they pass each other
*Monday, August 18, 2014 at 8:36pm*

**Math**

I wounder what is 5(29)? I just really don't under stand how to solve it.
*Monday, August 18, 2014 at 7:48pm*

**math**

49. How many integers between 70 and 105 have a reminder of 2 when divided by 15?
*Monday, August 18, 2014 at 7:11pm*

**math**

59. The scale on a map is 1 inch= x miles. What is the distance, in inches, on the map between two cities that are m miles apart?
*Monday, August 18, 2014 at 7:07pm*

**math**

If an item that sells for $81.00 has a 50.0% markup on cost, what is the cost?
*Monday, August 18, 2014 at 6:44pm*

**MAth**

when working with numbers (negative and positive)inside absolute value bars are they considered positive and bars removed?
*Monday, August 18, 2014 at 5:52pm*

**MAth**

absolute value problems |30|/|10| + |-2+7|/5 x 8 = 17.4 is this answer correct?
*Monday, August 18, 2014 at 5:32pm*

**math **

which numbers should you add to estimate the answer to this problem: 87,087 + 98.000 - 88,000+ 98,000 -85,000+95,000 - 87,000 +98,000 - 80,000+ 90,000 thanks for your help!
*Monday, August 18, 2014 at 5:03pm*

**math **

thanks damon! u rock! another quick question....how do you estimate the total precipitation in inches and the total number of days with precipitation asheville and wichita asheville= 47.71 inches 124 days wichita = 28.61 inches 85 days
*Monday, August 18, 2014 at 4:42pm*

**math**

estimate the total weight of two boxes that weigh 9.4lb and 62.6 lb using rounding and compatible numbers. Which estimate is closer to the actual total weight? why? thanks!
*Monday, August 18, 2014 at 4:26pm*

**math**

The length of a rectangle is 7 m less than triple the width. If w represents the width, write an expression for the length The length of a rectangle is 7 m less than triple the width. If w represents the width, write an expression for the length, l.
*Monday, August 18, 2014 at 12:50pm*

**math**

The length of a rectangle is 7 m less than triple the width. If w represents the width, write an expression for the length
*Monday, August 18, 2014 at 12:44pm*

**Math**

Which shows the product of a number n and 12? A.n-12 B.n/12 C.12n D.n+12 Is the answer D?
*Monday, August 18, 2014 at 12:31pm*

**math**

Eric received 76 tokens to use in the arcade at the pizza restaurant. Which of the following inequalities represents the number of tokens Eric used in the arcade? x < 76 x < 76 x > 76 x > 76
*Monday, August 18, 2014 at 11:02am*

**math**

Starting from today, every month you save $500 into a bank account with earns interest at an annual rate of 4%. How much money do you have in the account at the end of 4 years?
*Monday, August 18, 2014 at 9:50am*

**Math**

a person sol 100 shares of stock at a profit of 15%. if the selling price for the 100 shares was 2300. what was paid for the stock?
*Sunday, August 17, 2014 at 11:51pm*

**Math**

A person stock worth 2300 at 100 shares and they had a 15 % profit how much was the stock
*Sunday, August 17, 2014 at 11:47pm*

**math**

a bag contains 400 coins ,and 33 1/2 % are nickels, how many nickels are there?what percent of the coins are not nickels
*Sunday, August 17, 2014 at 10:40pm*

**math**

The leng of the smaller rectangle is 1 inch less than twice its wide. both the dimensions of the larger rectangle are 2 inches longer than the smaller rectangle. the area of the shaded region is 86 square inches. what is the area of the smaller rectangle?
*Sunday, August 17, 2014 at 9:33pm*

**Math**

Assign variables for the following problem (you do not need to solve the problem) Thirty fluffaluff trees are introduced on an island at the start of year zero. At the start of thirty there are 55 fluffaluff trees. Use the fluffaluff formula to find how many fluffaluff trees ...
*Sunday, August 17, 2014 at 9:25pm*

**Math**

You ride your bike at an average speed of 8 miles per hour.how many miles can you travel in 1.5 hours?
*Sunday, August 17, 2014 at 8:54pm*

**important math question**

the equation x^3 -x-5=0 has one solution for x between -2 and 2. what is the solution? how do I get this
*Sunday, August 17, 2014 at 2:37pm*

**math**

evaluate the limit as x approaches 0 from the right. of the function xcos(1/x) I know the answer is O but I am not sure as of my reasoning. I just that that since cos(1/x) is being multiplied by a number approching 0 that the whole limit would be o.
*Sunday, August 17, 2014 at 2:17pm*

**math**

a computer is being lowered into the ocean from a platform. at this moment it is 210 feet below surface and being lowered 150 feet every 30 minutes. how to write this in the form of an expression?
*Sunday, August 17, 2014 at 12:13pm*

**math**

The length of a rectangle of perimeter 64 cm is 5/3 of its breadth . Find the area of rectangle ?
*Sunday, August 17, 2014 at 11:19am*

**math**

A swimmer S is in the sea at a distance of 4km from the closest point A on a straight shore.His house B is on the shore at a distance 5km from A.He can swim at a speed of 3km/hr.The distance of the point on the shore from B so that he reaches his home in the minimum time is=?
*Sunday, August 17, 2014 at 10:27am*

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