Saturday

April 18, 2015

April 18, 2015

**Branches of Math**

**Recent Math Questions**

**Math Help!**

I apologize for all these questions but I really need to get them done fast so I appreciate if you tried to answer some of them! 1. Bill is saving money in an empty jar. The first day he puts in a certain amount of money. Every day after the first he puts in 2 more dollars ...
*Sunday, February 22, 2015 at 5:41pm*

**Vectors Math**

You will often see proj (Vector a onto Vector b) written as proj b⃗ a⃗ .Show that projb⃗ a⃗ =(a⃗ ⋅b⃗ b⃗ ⋅b⃗ )b⃗ .
*Sunday, February 22, 2015 at 4:47pm*

**math**

Problem 6-1 Bank Reconciliation The following information is available to assist you in preparing a bank reconciliation for Calico Corners on May 31, 2012: a. The balance on the May 31, 2012, bank statement is $8,432.11. b. Not included on the bank statement is a $1,250 ...
*Sunday, February 22, 2015 at 4:27pm*

**math vectors**

If Vector a = (2, 2k), Vector b = (4, -k), are perpendicular, solve for k with solutions?
*Sunday, February 22, 2015 at 4:15pm*

**Math vectors**

If Vector a = (5, -5, 3), Vector b = (1, 2, 3), determin proj (Vector a onto Vector b).
*Sunday, February 22, 2015 at 4:14pm*

**Math**

Every hour a clock chimes as many times as the hour. For example, the clock chimes 4 times at both 4:00 am and 4:00 pm. How many times does it chime from 4:00am through 11:00 pm of the same day including 4:00 am and 11:00 pm.? What is the proper way of doing this question ...
*Sunday, February 22, 2015 at 4:03pm*

**Math**

Molly is currently making 42000 a year her contract includes a 3% raise each year what is her salary for the next 5 years Current. 42000 After 1. 43260 After 2. 44558 After 3. 45895 After 4. 47272 After 5. 48690
*Sunday, February 22, 2015 at 4:02pm*

**math**

If a fowl is treated, probability of dying is 1/10 while if not treated the probability is 7/10 calculate the probability that, a fowl picked at random from the 36 fowl is (i) Treated with the drug and will die (ii) Not treated with the drug and will die (iii) Not treated with...
*Sunday, February 22, 2015 at 3:54pm*

**math**

Barry is getting an early start on this year's summer chores, he started painting his house already. Barry started out with 110 ounces of blue paint, 120 ounces of red paint, 150 ounces of white paint. Barry painted 4 EQUAL SIZED stripes on his wall: 1 blue stripe, 1 red ...
*Sunday, February 22, 2015 at 3:48pm*

**Math Vectors**

A plane is heading on a bearing of 200° with an air speed of 400 km/h when it is blown off course by a wind of 100 km/h from the northeast. Determine the resultant ground velocity of the plane. How did you get your answer?
*Sunday, February 22, 2015 at 3:35pm*

**Calc Math**

A plane is heading on a bearing of 200° with an air speed of 400 km/h when it is blown off course by a wind of 100 km/h from the northeast. Determine the resultant ground velocity of the plane. What was your solution to answering this problem?
*Sunday, February 22, 2015 at 3:35pm*

**Math**

Bill is saving money in an empty jar. The first day he puts in a certain amount of money. Every day after the first he puts in 2 more dollars than the amount he put in on the previous day. After 10 days he has put 200 dollars in the jar. How much money did he pit in the jar on...
*Sunday, February 22, 2015 at 3:25pm*

**Math check**

1. If LMNO is a parallelogram, and LM=2y-9 and NO=y-2, find the value of 'y'. Does y=7? 2. RSTV is a parallelogram. RT and SV intersect at Q. RQ=5x+1 and QT=3x+15. Find OT. Does QT=7? 3. RATS is a parallelogram. If angle s= (8x) and angle t=(7x) then find the value of...
*Sunday, February 22, 2015 at 3:22pm*

**Math**

1. Daniel wants to save at least 20 dollars by putting pennies in a jar daily. On first day, he puts one penny into the jar. The second day he puts 2 pennies into the same jar. On the nth day he pus n pennies into the same jar. Which day is the first day on which he has at ...
*Sunday, February 22, 2015 at 3:20pm*

**Math**

After dinner, three friends at a restaurant paid their bill and noticed a bowl of mints on the front counter. Sean took one-third of the mints but returned four because he had a momentary pang of guilt. Fred then took one-fourth of what was left but returned three for similar ...
*Sunday, February 22, 2015 at 3:17pm*

**Math**

A Mortar shell is fired with muzzle speed of 500ft/sec.Find the angle of elevation of mortar if the shell strikes a target located 1200ft away. What is the maximum height of the shell?
*Sunday, February 22, 2015 at 2:45pm*

**physics/chemistry**

how does one calculate the work done by a spherical bubble with radius r in a liquid with a surface tension of T. I understand for a cavity it is 8pi(r)T, would you just double it to get 16pi(r)T because there are 2 films? here's the math....2(4pi((r)+dr)^2 -4pir^2) for a ...
*Sunday, February 22, 2015 at 2:39pm*

**math**

4% on 185000 is what?
*Sunday, February 22, 2015 at 2:23pm*

**math**

A man who is 1.6 m tall is walking on the road at a constant speed of 1 m/s. There is (only) one lamp placed 3.2 m above the road. At a specific moment the man was just under the lamp. What will be the rate at which the length of his shadow will be changing after: a) 2 sec b) ...
*Sunday, February 22, 2015 at 12:47pm*

**math**

How would i expand (x-1)(x+2)-(x-3)^2
*Sunday, February 22, 2015 at 12:34pm*

**math**

A wire of length 4 m is cut in two parts and the first part is bent in the shape of a square, while the second part is bent in the shape of an equilateral triangle. For which lengths of these parts the total area enclosed by the square and the triangle is: a. minimized? b. ...
*Sunday, February 22, 2015 at 12:11pm*

**math**

How would i solve (3x-2y)^3 I keep getting the wrong answer
*Sunday, February 22, 2015 at 12:05pm*

**math**

Sam purchased 625 square feet of carpet for his bedroom, which is shaped as a square. What are the dimensions of his bedroom? Each side of the bedroom has a length of 25 feet. Each side of the bedroom has a length of 156.25 feet. Each side of the bedroom has a length of 390,...
*Sunday, February 22, 2015 at 11:51am*

**MATH**

I BOUGHT 80 DIFFERENT COMPUTER COMPOMENTS FOR $100000 AND I WANT TO SELL THEM TO MAKE 20% PROFIT ON EACH.GIVE ME A FORMULA HOW TO PRICE EACH.
*Sunday, February 22, 2015 at 11:39am*

**math**

5raise by 2009multiply by 2raise by 2010times24
*Sunday, February 22, 2015 at 11:27am*

**math**

A man who is 1.6 m tall is walking on the road at a constant speed of 1 m/s. There is (only) one lamp placed 3.2 m above the road. At a specific moment the man was just under the lamp. What will be the rate at which the length of his shadow will be changing after: a) 2 sec b) ...
*Sunday, February 22, 2015 at 11:17am*

**math**

Isaiah and Andy had a total of 560 trading cards. After Isaiah gave1/9 of cards to Andy they had an equal # of trading cards. How many more cards did isiah have than Andy at the beginning?
*Sunday, February 22, 2015 at 10:48am*

**Math**

A wire of length 4 m is cut in two parts and the first part is bent in the shape of a square, while the second part is bent in the shape of an equilateral triangle. For which lengths of these parts the total area enclosed by the square and the triangle is: a. minimized? b. ...
*Sunday, February 22, 2015 at 10:44am*

**math**

A truncated square pyramid (also known as a frustum) is an object obtained by cutting a square pyramid by a plane parallel to its base (as shown in the figure). For a truncated square pyramid it is known that the side length of the large base is 10 cm and the height (distance ...
*Sunday, February 22, 2015 at 10:20am*

**math**

A line with negative slope passes through the point P(5,2) and intersects the x-axis at the point A and the y-axis at the point B. a. Find the equation of the line for which the length of the segment AB is the smallest. b. Find the equation of the line for which sum of the ...
*Sunday, February 22, 2015 at 10:13am*

**math**

A trough (a place where horses and sheep drink water) has the shape of a half-cylinder with length 4 m and radius 20 cm. Water is poured into the trough at a constant rate of 300 cm3/s. At what rate (in cm/s) is the level of the water in the trough rising at the moment the ...
*Sunday, February 22, 2015 at 10:07am*

**Math**

Arrange 1/8,1/4,1/5,1/2,1/3,1/9 in ascending order.
*Sunday, February 22, 2015 at 4:32am*

**math**

Inside a long empty cylinder with radius R = 25 cm is put a long solid cylinder with radius r = 10 cm such that the bases of the two cylinders are attached. Then water is poured in the remaining empty region of the first cylinder until the height of the water becomes 30 cm (...
*Sunday, February 22, 2015 at 3:50am*

**Math**

-5,-3,-1,1,3,5 If a and b are different integers chosen from the list above, how many possible values are there of the product ab? I know the answer is 15 but do I always use factorial method whenever I meet questions that ask for how many possibilitites? And the factorial is ...
*Sunday, February 22, 2015 at 3:33am*

**Math**

One of two similar triangles has an area of 1/4 times that of the other. What is the ratio of its perimeter of the triangles? (I know the answer but I don't know the solution, please explain. Thank you very much!!)
*Sunday, February 22, 2015 at 2:29am*

**Math**

1. Daniel wants to save at least 20 dollars by putting pennies in a jar daily. On first day, he puts one penny into the jar. The second day he puts 2 pennies into the same jar. On the nth day he pus n pennies into the same jar. Which day is the first day on which he has at ...
*Sunday, February 22, 2015 at 1:53am*

**math**

insert two numbers between 5 and 135, so that the 4 may form a geometric progression
*Sunday, February 22, 2015 at 12:34am*

**math**

A salesman gets a commission of 2.4% on sales up to Shillings 100,000. He gets an additional commission of 1.5% on sales above this. Calculate the commission he gets on sales wroth shillings 280,000. 100000(.024) + 0.015(280000 - 100000) 2400 + 2700 5100
*Saturday, February 21, 2015 at 8:35pm*

**math**

how can find on the particular solution of the linear DE's d^3y/dx^3+4d^2y/dx^2+4dy/dx=exp(-2x)
*Saturday, February 21, 2015 at 7:34pm*

**math**

prove sum(x)=n(n+1)/2 from x=1 to x=n
*Saturday, February 21, 2015 at 7:31pm*

**Math**

Determine the solution set of 2x-3y<6 4x + 4y < 8 | This sign should be Less than or equal to
*Saturday, February 21, 2015 at 7:12pm*

**Math**

Question: 1/2(x+3) + 5x = 2 - 4/3 (1-2x) My work: 5 1/2x + 3/2 = 2/3 + 8/3x 33x + 9 = 4 + 16x 17x = -5 x = -17/5 Did I do this correctly?
*Saturday, February 21, 2015 at 7:06pm*

**math**

how can find sum (x) from x=1 to x=n
*Saturday, February 21, 2015 at 7:05pm*

**Math**

A video game that originally costs $68 is on sale at a 15% discount. What is your final cost of the video game If there is a 5% sales tax?
*Saturday, February 21, 2015 at 6:57pm*

**Math**

Find the slope of the line L1 given that L1 is perpendicular to L2 and L2 passes through (-3,-1) and (-5,7). How do you do this kind of problem
*Saturday, February 21, 2015 at 6:55pm*

**Math**

The fifth term of an arithmetic sequence is 22 and the 15th term is 62. Find the 100th term and the sum of the first 60 terms. I'm having trouble figuring out how to do this.
*Saturday, February 21, 2015 at 6:51pm*

**Math**

The line that passes through (4,3r) and (2+r,-6) is perpendicular to the line with equation 5x+3y+12=0. find r.
*Saturday, February 21, 2015 at 6:49pm*

**Math**

Find the point of intersection on the graphs of 2x+5y=15 and x-3y=6 How do I do this?
*Saturday, February 21, 2015 at 6:47pm*

**Math**

Flying to the wind, an airplane takes 4 hours to go 960 km. The same plane flying with the wind takes only 3 hours to make the same trip. Find the speed of the plane and the speed of the wind. I wasnt here for the lesson from my teacher but told me to ask my classmates but ...
*Saturday, February 21, 2015 at 5:48pm*

**Math**

The regular price of a sweater is $32. For a sale, the price of the sweater is marked down 30%. What is the price of the sweater?
*Saturday, February 21, 2015 at 5:08pm*

**Math**

Put 25 marbles into 3 piles, each has an odd # of marbles. How many ways can you do this??? Do you have the formula?
*Saturday, February 21, 2015 at 4:52pm*

**math concept**

Sarah understands that if there are 11 ones, the first 10 move over to the tens column as one unit (i.e., one group of 10). What concept does this understanding represent? A. Renaming B. Regrouping C. Borrowing D. Place value my answer is a
*Saturday, February 21, 2015 at 4:51pm*

**Math**

Evaluate 6 log2 ∛64 +10log3 (243)^1/5)
*Saturday, February 21, 2015 at 4:50pm*

**Math**

How many times larger is the area of a square (Length of Sides = A) than the area of an equilateral triangle (Length of Sides = 0.5A)?
*Saturday, February 21, 2015 at 4:34pm*

**math**

A man who can swim at 5km/h in still water swims towards the east to cross arriver. If the river flows from north to south at the rate of 3km/h a) Calculate: i) The resultant speed ii) The drift b) If the width of the river is 30m, find the time taken, in seconds, for the man ...
*Saturday, February 21, 2015 at 4:26pm*

**Math**

the sum of the integers from 1 to 10, inclusive, is 55. What is the sum of the multiples of 5 from 5 to 50 inclusive? Which equation would I use?
*Saturday, February 21, 2015 at 3:52pm*

**math**

The length and breadth of a rectangular paper were measured to be the nearest centimeter and found to be 18 cm and 12 cm respectively. Find the percentage error in its perimeter.
*Saturday, February 21, 2015 at 3:51pm*

**math**

please help on this problem. -2x+4(3x-4)=84. cant get the answer. thank you
*Saturday, February 21, 2015 at 3:19pm*

**Math**

determine the point of intersection for this pair. y=-3x-2 and 2x+3y=5
*Saturday, February 21, 2015 at 3:04pm*

**Business math**

Compute the difference between the ordinary interest and the exact interest for a loan with a principle amount of $1100 at 12 percent for 120 days. I'm getting $0.60 Can you check my work?
*Saturday, February 21, 2015 at 1:06pm*

**Business math**

The clarkdell school system has three schools. School #1 has 500 students School #2 has 600 students School #3 has 400 students What part of a $15,000 allocation will go to school #2? 15,000 divide by 3= $5,000 Will you check my answer?
*Saturday, February 21, 2015 at 12:50pm*

**business math**

Compute the total amount to be repaidon a $1920 loan at 8% for 135 days. Base your calculation on exact interest(365-day year). I'm getting $2335.29. Can you check my work?
*Saturday, February 21, 2015 at 12:31pm*

**Math**

an adult manatee eats approximately 100 pounds of aquatic food per day. write an equation to find p, the numbeer of ponds of food an adult manatee eat in d days
*Saturday, February 21, 2015 at 11:41am*

**Math**

An adult polar bear walks at an average rate of 5 kilometers per hour. 1. write an equation to find k, the number of kilometers a polar bear bear can walk in h hours. 2.make a table to show the relationship between the number of kilometers k a polar bear can walk and the ...
*Saturday, February 21, 2015 at 11:36am*

**math**

A vector can be used to represent the path of a drill tip used to bore a deep mine shaft in Sudbury one quarter of the way to the centre of the Earth. Represent the vector using a directed line segment and Cartesian co-ordinates and describe which representation may be more ...
*Saturday, February 21, 2015 at 11:30am*

**math**

Amanda's punch recipe : 7 parts mixed fruit juice, 2 parts of lemonade [Question : how much lemonade will she need to make 180 fluid ounces of punch ?]A .140 Fluid ounces or B. 40 Fluid ounces C. 36 Fluid ounces D. 60 Fluid ounces i think the answer is b am i right
*Saturday, February 21, 2015 at 9:33am*

**math**

A trough (a place where horses and sheep drink water) has the shape of a half-cylinder with length 4 m and radius 20 cm. Water is poured into the trough at a constant rate of 300 cm3/s. At what rate (in cm/s) is the level of the water in the trough rising at the moment the ...
*Saturday, February 21, 2015 at 6:31am*

**math**

A wire of length 4 m is cut in two parts and the first part is bent in the shape of a square, while the second part is bent in the shape of an equilateral triangle. For which lengths of these parts the total area enclosed by the square and the triangle is: a. minimized? b. ...
*Saturday, February 21, 2015 at 6:06am*

**math**

Jill, Meg, and Beth are sisters. Jill is 2 years younger than Meg. Beth is half as old as Meg. Use the same variable to write three algebraic expressions based on this situation. Tell what the variable represents and what each expression represents. THANK YOU!
*Saturday, February 21, 2015 at 3:41am*

**math**

A group of people planned to contribute equally towards a water project which needed Ksh 200,000 to complete, however, 40 members of the group without from the project. As a result, each of the remaining members was to contribute Kshs 2,500. (a) Find the origina number of ...
*Saturday, February 21, 2015 at 2:45am*

**math**

The distance between towns M and N is 280 km. A car and a lorry travel from M to N. The average speed of the lorry is 20 km/h less than that of the car. The lorry takes 1 h 10 min more than the car to travel from M and N. (a) If the speed of the lorry is x km/h, find x (b) ...
*Saturday, February 21, 2015 at 2:10am*

**math**

Pharmacy Goods has a total of $423,400 sales. Beginning inventory total cost was $105,850 and ending total cost was $127,020. What is the turnover rate?
*Saturday, February 21, 2015 at 2:04am*

**Math**

An aeroplane is taking off from landing field has to run 500 metres.it leaves the ground in 10 seconds.what is the acceleration?
*Saturday, February 21, 2015 at 1:16am*

**math**

Velocity V ms, of a moving body at time t seconds is given by V = 5t2 -12t + 7
*Friday, February 20, 2015 at 9:00pm*

**Math**

A roll of paper towels is 10 inches high and 2.5 inches in diameter. How many full squares inches of paper towel can fit on the roll in 15 rotation? * all I need is a formula of this question. Do I use lateral surface area formula or total surface area formula
*Friday, February 20, 2015 at 8:44pm*

**math**

A triangular plot ABC is such that AB = 36m, BC = 40m and AC = 42 m a) Calculate the: i) Area of the plot in square meters √(s(s-a)(s-b)(s-c)) How to find S?
*Friday, February 20, 2015 at 8:09pm*

**math **

There were 15.37 million licensed drivers in Texas in 2009 and 14.54 million in 2004. Find a formula for the number, N, of licensed drivers in the US as a function of t, the number of years since 2004, assuming growth is (a) Linear N(t)= million drivers (b) Exponential N(t)= ...
*Friday, February 20, 2015 at 7:34pm*

**Math/algebra**

i'm dividing 52 glass bears into groups she has 1 left over how many groups thanks ella
*Friday, February 20, 2015 at 6:47pm*

**math**

Three people Fatuma, Ali and Hassan contributed money to start a business.Fatuma contributed a quarter of the total amount and Ali two fifths of the remainder. Hassan’s contribution was one and a half times that of Fatuma. They borrowed the rest of the money from the bank...
*Friday, February 20, 2015 at 5:33pm*

**math**

Given that sinθ = 2/3 and is an acute angle. Find: Tanθ giving your answer in surd form θ = tan^(-1)〖(2/√5)= 41.81°〗 Sec^22 θ θ= cos^(-1)〖(3/√5ӏ1;)=
*Friday, February 20, 2015 at 5:05pm*

**math**

solve d^3y/dx^3+4d^2y/dx^2+4dy/dx=exp(-2x)
*Friday, February 20, 2015 at 4:54pm*

**Math**

Mrs. Monk is wrapping presents . If a roll and a half wraps 5 gifts, if there are 9 same sized presents, how many rolls of paper are needed?
*Friday, February 20, 2015 at 4:49pm*

**math**

solve d^3y/dx^3-3d^2y/dx^2+2dy/dx=exp(2x)
*Friday, February 20, 2015 at 4:02pm*

**Math **

Hi! So I asked about this question earlier and I've been trying to solve it with the directions I was given by someone before, but, I'm still confused and keep getting weird numbers. Can someone help me with this? Directions: Find the angle, θ, between the vectors...
*Friday, February 20, 2015 at 3:58pm*

**math.help pls**

A line segment with endpoints A(–4, 3, 2) and B(5, –6, –1) is translated first 2 units back, 3 units right, and 1 unit up. The image is then translated 7 units to the left. What are the coordinates of B´? A: (3, 4, 0) B: (3, –10, 0) C: (5, –6, &#...
*Friday, February 20, 2015 at 3:01pm*

**Math Plz help**

A theoretical probability distribution shows the probabilities of all the outcomes except for one. If the total of the shown outcomes is 0.5, then the probability of the missing outcome must be A.) 0.25 B.) 0.2 C.) 0.75 D.) 0.5
*Friday, February 20, 2015 at 2:48pm*

**Math Help**

Hi! I'm really confused on how to do this. Can someone help me? Thanks a bunch! Directions: Use the vectors u = <2, 2>, v = <-3, 4> and w = <1, -2> to find the indicated quantity. a. 3u ∙ v b. (u ∙ 2v)w
*Friday, February 20, 2015 at 2:05pm*

**math**

The length and breadth of a rectangular floor were measured and found to be 4.1 m and 2.2 m respectively. If possible error of 0.01 m was made in each of the measurements, find the: (a) Maximum and minimum possible area of the floor (b) Maximum possible wastage in carpet ...
*Friday, February 20, 2015 at 2:05pm*

**Math**

Please help me and show an understanding please, so I see how to figure them out. Lee deposited $28,000 in an interest-bearing checking account that earns 3.5% interest compounded daily. Find the amount after 68 days. a.$183.16 b.$28,180.46 c.$28,183.16 d.$180.46 On April 10th...
*Friday, February 20, 2015 at 1:52pm*

**math**

Cecily Made a poster in the shape of a quadrilateral. All the angles and sides of the poster are congruent. Which of the following names the shape of Cecily's poster Square (a) rectangle (b) pentagon (C) trapezoid (D)
*Friday, February 20, 2015 at 12:48pm*

**Math**

You roll a number cube and get a one 7 times, a two 8 times, a three 5 times, a four 9 times, a five 8 times, and a six 5 times. What is the experimental probability of rolling an odd number?
*Friday, February 20, 2015 at 12:12pm*

**Math**

A spinner is split up into 4 colored areas of the same size: red, blue, green, and yellow. What is the theoretical probability of the spinner landing on one of these four colors?
*Friday, February 20, 2015 at 11:47am*

**math please help**

Dose anyone have ideas for a bedroom using this list? The layout must include the symmetrical placement of two items in the bedroom. Label two acute, two right, and two obtuse angles in the bedroom. Label at least ten different polygons in the bedroom. Be sure to include both ...
*Friday, February 20, 2015 at 11:21am*

**Math**

What is a “real” zero? 1. A solution to a polynomial. 2. A non-imaginary number. 3.An x-intercept of a polynomial. 4. All of the above. The answer is 4, right?
*Friday, February 20, 2015 at 10:58am*

**math**

6+x= 12 i got 2??? is this right
*Friday, February 20, 2015 at 10:06am*

**math**

about powers and roots
*Friday, February 20, 2015 at 9:56am*

**Math**

Mrs monk rented a truck for 3 days. Enterprise charged her $40. per day plus $.25 per miles. The total charge was $142.75. How many miles did she drive the truck? (1) 411 miles (2) 91 miles (3) 251 miles (4) 571 miles
*Friday, February 20, 2015 at 9:52am*

**Math**

Mr. lim bought an equal number of red and yellow tulips. He gave away 24 red tulips. Then tere were4 times as many yellow tulips. How mani tulips did he buy? Anna is 14 kg heavier than lily. Sharon is 8 kg lighter than Bona. If lili weights 48 kg, find the total mass of sharon...
*Friday, February 20, 2015 at 8:49am*

**Math**

How do you find the angle, θ, between the vectors? If needed, round your answer to the nearest tenth. 1.) u = 2i - 3j v = i - 2j 2.) u = <3, 2> v = <4, 0>
*Friday, February 20, 2015 at 8:36am*

**Math**

Hi! Can someone help me with these? Thanks a bunch! :) 1.) Find the dot product. <0, 3> ∙ <4, -2> 2.) Find the dot product of u and v. u = <-4, 1> v = <2, -3>
*Friday, February 20, 2015 at 7:50am*