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September 20, 2014

Homework Help: Math

Branches of Math

Recent Math Questions

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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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