Monday

March 30, 2015

March 30, 2015

**Branches of Math**

**Recent Math Questions**

Post a New Question | Current Questions

**math**

Each homeroom of a middle school receives 1/12 of a 5/6 acre of land. How many homerooms receive a plot of land?
*Friday, February 27, 2015 at 10:38pm*

**Math**

In order to properly design a heating system for a greenhouse, the volume of air in the building needs to be determined. Find the volume of air in the greenhouse below. (3 pts)
*Friday, February 27, 2015 at 10:01pm*

**math vectors**

Use a specific example to prove that the cross product is also not associative. That is, use three specific vectors in 3-space to show that Vector a×(Vector b × Vector c) is not equal to (Vector a × Vector b) × Vector c. Can you help me think of an ...
*Friday, February 27, 2015 at 7:29pm*

**Math Vectors**

Verify (a + a) × (a+ b) = 0⃗ . What can be said about two vectors whose cross product is the zero vector a x b = i j k 3 -3 1 -12 12 -4 = i ( (-3) · (-4) - 1 · 12 ) - j ( 3 · (-4) - 1 · (-12) ) + k ( 3 · 12 - (-3) · (-12...
*Friday, February 27, 2015 at 7:02pm*

**math**

During a severe thunderstorm, Tim saw a flash of lightning and then six seconds later heard a clap of thunder. The speed of sound is 1088 ft/sec. How far is Tim from the lightning? Nearest Thousand Feet.
*Friday, February 27, 2015 at 6:06pm*

**math**

A uniform horizontal beam weighing 136 kg is 10.4 m long and is supported by columns at each end. A vertical load of 1275 kg is applied to the beam x metres from the right end. Find x so that the reaction at the left column is 540 kg. Round your answer to 2 decimal places
*Friday, February 27, 2015 at 5:55pm*

**word math**

len puts ten marbles in each bag. two tenth are stripped.if len makes ten bags of marbles how many stripped marbles do he need?
*Friday, February 27, 2015 at 5:27pm*

**Math vectors**

Verify (a + b) × (a + b) = 0 What numbers can go into the equation as vector A(coordinates) and what numbers can go into the equation as vector B (coordinates) in order for the answer to be 0???
*Friday, February 27, 2015 at 5:08pm*

**math**

It is recommended that 3/5 of the calories a person consumes come from carbohydrates. If 1/12 of these calories should be from fiber, what fraction of the number of calories should come from fiber?
*Friday, February 27, 2015 at 3:09pm*

**math**

Nathan deposited 7/9 of his allowance into his savings account. He spent the remaining amount, or $2.50. How much did Nathan deposit into his savings account? Should I multiply 7/9 *2 1/2 or 7/9 * 250
*Friday, February 27, 2015 at 3:01pm*

**Math vectors**

What can be said about two vectors whose cross product is the zero vector?
*Friday, February 27, 2015 at 2:53pm*

**math**

having a spacey moment...can anyone show me how to solve for Er? Er-1/Er+2 = X
*Friday, February 27, 2015 at 2:00pm*

**Math**

Davida bought a pair of earrings, each in the shape of an isosceles triangle with equal side lengths of 24 mm and a base length of 16 mm. She used one earring to make another pair of earrings, similar in shape, with the base length equal to 11 mm. What is the length of the ...
*Friday, February 27, 2015 at 1:34pm*

**Math vectors**

Verify using an example that a(b+c) is not equal to ab+ac. (This means that addition does not distribute over the dot product.) My solution: is this correct? a(b+c)= ab+ac is ALWAYS true for whatever numbers you substitute let a = 16 b = 3 and c = 5 so LHE = a/(a + b) = 16 / (...
*Friday, February 27, 2015 at 12:28pm*

**Business math**

A watch with a list price of $889.00 is sold by a wholesaler at a net cost of $545.75. Find the single trade discount rate being offered. round to the nearest tenth of a percent 889.00*61.4? since trade discount equals list price * trade discount percentage? 54.58 would be the...
*Friday, February 27, 2015 at 12:21pm*

**math**

At 8 A.M., Dylan and his neighbor, Mickey, drove in their cars to a city that was 240 mi. away from their neighborhood. When Dylan reached the city, Mickey had 40 mi. to go. He finally completed the trip 48 minutes later. a) How long did it take Mickey to drive to the city? b...
*Friday, February 27, 2015 at 12:09pm*

**math**

Suppose you deposit $350 in a bank account that pays 6% annual simple interest. Find the interest earned in 4 months and in 1 year.
*Friday, February 27, 2015 at 11:53am*

**math**

Hi, How do I improve my math skills? I can't calculate in my head (I.e 2x43), I would actually have to write it down to solve it. I took pre-calc, calc and didnt have problem understanding. I don't know what is wrong. what should I do?
*Friday, February 27, 2015 at 11:46am*

**math**

when asked how many pennies she had a collector said If I arrange them in stacks of five, none are leftover if I arrange them in stacks of six, none are leftover if I arrange them in stacks of seven one is left over. What is the least number of coins she could have
*Friday, February 27, 2015 at 10:53am*

**math**

The rental rate on a car is $40.00 per day and 30¢ per mile. How much does Raoul pay for renting this car for 2 days and driving a total of 150 miles?
*Friday, February 27, 2015 at 10:24am*

**math**

in number 13,407.036 there are two 3's explain how the values of the 3's are related?
*Friday, February 27, 2015 at 7:58am*

**7th grade math**

Can you help with geometry? 1. Sally constructs a triangle with one side 6 inches long and another side 8 inches long. What is the 3rd side? (haven't learned Pythagorean theorem) Ans: 6 + x > 8 x > 2 6 + 8 > x 14 > x 8 + x > 6 x > -2 so, x must be > 2...
*Friday, February 27, 2015 at 7:31am*

**Math**

What is the probability of getting a number larger than 10 for the first time on the third roll
*Friday, February 27, 2015 at 2:26am*

**math fractions**

Rogelio has 3 one-dollar bills, 5 quarters, 4 dimes, 2 nickels, and 9 pennies. What fraction of the coins are quarters?
*Friday, February 27, 2015 at 12:38am*

**Math**

What is the potential energy in a body of mass 5kg on top of a pole 20metres high ?
*Friday, February 27, 2015 at 12:32am*

**3rd grade math**

Justin took photographs during a trip to the mountains. He used one roll of color film and one roll of black-and-white film. He took 1/3 of the pictures in color during a picnic with his family. If he took 36 pictures in all, how many color pictures did he take during the ...
*Friday, February 27, 2015 at 12:13am*

**math**

first string sports can purchase sneakers for $450 per dozen less trade discounts of 14/12 from ideal shoes. Fancy footwear is offering the same sneakers for $435 less trade discounts of 18/6. Which supplier offers a lower net price? would i be correct if i said first string ...
*Friday, February 27, 2015 at 12:11am*

**math**

Iin October, a hard ware store purchased snow shovels fo $8 each. The original markup was 50% base on the selling price. In December, the store had a sell and mark down the shovels by 20%. By January 1, the sale was over and the shovels were markup 15%. In March, the store ...
*Friday, February 27, 2015 at 12:09am*

**3rd grade math**

A parking lot near the sports field holds a total of 52 vehicles. There are 42 cars parked there now. Half of these cars are red, 10 are blue, and the rest are silver. What fraction of the cars are silver?
*Friday, February 27, 2015 at 12:07am*

**math**

it takes about 20 minutes to grade a student's paper. How long, in hours, does it take to grade papers for a class of 25 people?
*Friday, February 27, 2015 at 12:04am*

**math**

An electrician cuts a 12-ft piece of wire into two pieces one piece is 8 feet shorter than the other piece how long was each piece
*Friday, February 27, 2015 at 12:03am*

**math**

in the number 13,407.036 the are two 3's explain how the values of 3's are related?
*Thursday, February 26, 2015 at 11:59pm*

**3rd grade math**

A pile of index cards has a mixture of white, pink, yellow, red, and blue cards. Some cards are lined, and some are unlined. The total number of cards is 150. 2/5 of the cards are blue, 10 cards are white, and 10 cards are red. Half of the remaining cards are pink. How many ...
*Thursday, February 26, 2015 at 11:46pm*

**MAth**

Two thirds of the musicians in a 16-piece band are girls. the 16 musicians include 12 brass players. what fraction of the band plays brass instrument?
*Thursday, February 26, 2015 at 11:33pm*

**3rd grade math**

Two thirds of the musicians in a 16-piece band are girls. the 16 musicians include 12 brass players. what fraction of the band plays brass instrument?
*Thursday, February 26, 2015 at 11:31pm*

**Math**

Write an equation for the variable h. V=1/3ñr^2h The ñ is pi, and the ^2 is an exponent.
*Thursday, February 26, 2015 at 11:01pm*

**math**

A watch with a list price of $889.00 is sold by a wholesaler at a net cost of $545.75. Find the single trade discount rate being offered. round to the nearest tenth of a percent To solve this i did 545.75 divided by 889.00 that gave me 0.61389 which comes out to 61.4% if i ...
*Thursday, February 26, 2015 at 10:09pm*

**math**

The list price of a set of fine china is $345.70 and the trade discount is 55%. Find the net cost. I did $345.70 *.55= 190.14 that gives me the trade discount. i'm confused on how i then find the net cost, do i subtract 190.14 from 345.70 to get the net cost?
*Thursday, February 26, 2015 at 9:44pm*

**math**

A gardner makes a vegetable garden that has an area of 35 sq.m. If the length of the garden is 7m, what is the width?
*Thursday, February 26, 2015 at 9:42pm*

**math **

If Owen gives $40 to Charley, the will have an equal amount of money. If Charley gives $80 to Owen, the ratio of Owen's money to Charley's money will be 4-1.How much money does Owen have in the beginning? Work: I don't have much but X=Owen C=charley X=C-40 4C=O+80
*Thursday, February 26, 2015 at 9:42pm*

**Math**

Kin has finished eight of the ten math problems. Phil has finished 2/5 of the math problems. How much more of the math has Kim finished?
*Thursday, February 26, 2015 at 9:20pm*

**math**

At 8 A.M., Dylan and his neighbor, Mickey, drove in their cars to a city that was 240 mi. away from their neighborhood. When Dylan reached the city, Mickey had 40 mi. to go. He finally completed the trip 48 minutes later. a) How long did it take Mickey to drive to the city? b...
*Thursday, February 26, 2015 at 9:18pm*

**Math**

What is the difference between three-twelfths and five-eights?
*Thursday, February 26, 2015 at 9:11pm*

**Math**

green park is adding 236 plants this spring. One hundred fifty of them will flower. The rest will not flower. Use this information to answer question. 1) 1/3 of the flowering plants will have yellow flowers and 1/4 of the flowering plants will have white flowers. What fraction...
*Thursday, February 26, 2015 at 8:36pm*

**Math**

What is the solution of the inequality 1_< x What is the sum of 4 and x is greater than 6 A snake's body temperature never goes below 3C what inequality can I write to represent this Nina wants to take at least $15 to the movies. What inequality can I write to represent...
*Thursday, February 26, 2015 at 8:34pm*

**Math**

Two rectangles have an area of 81 square inches.Name two possible perimeters for the rectangles.
*Thursday, February 26, 2015 at 8:26pm*

**math**

On a weekend road trip, the Jensen family drove 210 miles on highways, where their car gets 35 miles for each gallon of gasoline, and 54 miles on city streets, where their car gets 18 miles for each gallon. How many gallons of gas did they use?
*Thursday, February 26, 2015 at 8:20pm*

**math**

a box containing 4 identical books weighs 5kg. If the weight of the box is 600g, what is the weight of each book?
*Thursday, February 26, 2015 at 8:16pm*

**math**

I bought 10 bananas. Each banana weighed 50 grams. If the price for bananas was $6.50 per kg, how much did I pay?
*Thursday, February 26, 2015 at 8:13pm*

**math**

Philip wants to buy a bicycle for $189. He was $24 and plans to save $15 each week. In how many weeks will he be able to buy the bicycle?
*Thursday, February 26, 2015 at 8:03pm*

**math proportions**

At a certain time of the day, a 5 foot 1 inch woman casts a 3 foot 4 inch shadow. How tall is a nearby tree that casts a 12 foot 10 inch shadow at the same time of ...
*Thursday, February 26, 2015 at 7:52pm*

**Math**

use the limit definition of the derivative to find f' a. let f(x)= 1/(x^2) b. let f(x)= x^4 c. let f(x)= 9(3√(x^2)
*Thursday, February 26, 2015 at 7:52pm*

**Math vectors**

For which of the following conditions will the cross product of two vectors be zero? a) If the angle between them is 90°. b) If the angle between them is 0°. c) If the angle between them is 45°. d) If the vectors have the same magnitude.
*Thursday, February 26, 2015 at 7:50pm*

**Math**

an airport mixes and additive into its jet fuel. The ration of fuel to additive needs to be kept the same. Complete the table below for amount of additive required for different amounts of fuel fuel (kg) 63 84 98 add 9(g) 30 42 48
*Thursday, February 26, 2015 at 7:47pm*

**Math**

John and Miles each had some money. First Miles gave John a quarter. Then John gave Miles one-third of his money. Then Miles gave John one-third of his money. At the end, John had $2.50 and Miles had $2.00. How much did they each start with?
*Thursday, February 26, 2015 at 7:37pm*

**math**

an apple orchard covers 12 acres. There is a watering spout for every 1/4 acre. Are there more or fewer than 12 watering spouts? I think there are more. I think there are 48 watering spouts. Is this correct?
*Thursday, February 26, 2015 at 7:30pm*

**Math**

Dear Ms. Sue, Should I multiply & if I do will the answer be 6? Will it be shorter for Raul's throw? Now am I correct?
*Thursday, February 26, 2015 at 7:22pm*

**math**

Carlos can throw a ball 14 yards. Raul can throw 3/7 of that distance. Is Raul's throw longer or shorter than 14 yards? I think it is longer by 32 2/3 yards. Is this correct?
*Thursday, February 26, 2015 at 7:18pm*

**math**

dear ms. sue yes each piece is suppose to be 1/4 foot long.
*Thursday, February 26, 2015 at 7:14pm*

**math**

Yoshi has a rope 30 feet long. He must cut it into pieces that are 1/4 long. Will he get more or fewer than 30 pieces? I think more because he will divide it. So I think he will get 120 pieces. Is this correct?
*Thursday, February 26, 2015 at 7:08pm*

**Math/Solve**

ABC phone company charges $17 per month plus $0.03 per minute of phone calls. XYZ phone company charges $8 per month plus $0.06 per minute of phone calls. How many minutes of phone calls in a month make XYZ phone company a better deal?
*Thursday, February 26, 2015 at 6:55pm*

**Math**

The coordinates of triangle RPQ are R(2, -1), P(2, 2), and Q(-2, -1). What is angle P?
*Thursday, February 26, 2015 at 6:48pm*

**Math **

Identify the outlier for the following data set: 2.4,5.3,3.5,22.6,1.8,2.1,4.6 A. 2.4 B. 2.1 C. 22.6 D. 3.5 Is the answer C? Thank you
*Thursday, February 26, 2015 at 6:25pm*

**math**

The Position of two A and B on the earth’s surface are (36°N, 49°E) and (36°N, 131°W ) respectively. (a) The difference in long between town A and town
*Thursday, February 26, 2015 at 6:15pm*

**math**

it rained on 2/5 of all the days last month. On 1/6 of these rainy days it thunderstorm. On what fraction of the days last month were there thunderstorms?
*Thursday, February 26, 2015 at 6:08pm*

**math**

How many UNITS and how many MILES had Hector run when he finished the race? Explain how you know. Label each ANSWER. Example : ____ units _____ miles and I know this because _______.
*Thursday, February 26, 2015 at 6:03pm*

**Math**

Are these angle measures to the nearest tenth of a degree correct? 1. cos^-1(.3) Ans: 72.5 2. t^-1(38.4) Ans: 88.5 3. sin^-1(.7) Ans: 44.4
*Thursday, February 26, 2015 at 6:03pm*

**math**

You need to save $5 more than8 times your paycheck to buy a dirt bike .your paycheck is $50. how much money do you need to save ?
*Thursday, February 26, 2015 at 5:38pm*

**math**

2x+x=33 how would you solve this equation
*Thursday, February 26, 2015 at 5:26pm*

**math**

Two cups, two plates, and a pot cost $10.20 at a garage sale. A cup costs twice as much as a plate. The pot costs $3 more than a cup. What is the price of the pot? Explain how you got your answer.
*Thursday, February 26, 2015 at 5:17pm*

**math**

jake has 6 cards. 4 of his cards are red and 2 cards are blue. Alicia also has 6 cards. half of her cards are red. who has more red cards.
*Thursday, February 26, 2015 at 5:03pm*

**Math**

Two cups, two plates, and a pot cost $10.20 at a garage sale. A cup costs twice as much as a plate. The pot costs $3 more than a cup. What is the price of the pot? Explain how you got your answer.
*Thursday, February 26, 2015 at 5:02pm*

**math important**

what is 1661.9 to the nearest tenth
*Thursday, February 26, 2015 at 3:22pm*

**Math- Precalculus **

A utility company has the following rate schedule for natural gas usage in a city’s business district: Monthly service charge $8.80 Per therm service charge: 1st 25 therms : $0.6686/therm Over 25 therms: $0.85870/therm (a) What is the charge for using 25 therms in one ...
*Thursday, February 26, 2015 at 3:19pm*

**Math**

Fran wants to cover a rectangular box with contact paper. The box is 10cm long, and 5cm wide and 5cm high. How much paper will she need to cover all 6 sides?
*Thursday, February 26, 2015 at 2:34pm*

**Math**

Alex is making homemade cereal. For every 3 cups of granola he adds 1 cup of cranberries. If he uses a total of 3 cups of dried cranberries, how many cups of granola are in the cereal.
*Thursday, February 26, 2015 at 2:00pm*

**Math**

A library has fiction and nonfiction books. 2/5 of the library books are fiction. Of these 1/5 are mysteries. 1/3 of the nonfiction books are mysteries. What fraction of all the books are mysteries?
*Thursday, February 26, 2015 at 1:51pm*

**math**

The coach uses a scale drawing of the soccer field. the diagram uses a scale of 1/4 inches : 30 feet.What are the actual dimensions? What is the length and width of the field? What us the area of the field?
*Thursday, February 26, 2015 at 12:50pm*

**Math - Algebra**

our riding your bike to the park, sit to read for a while, and then ride your bike home. It takes you less time to ride from the park to your house than it took to ride from your house to the park. Draw a sketch of a graph that shows your possible distance traveled over time. ...
*Thursday, February 26, 2015 at 12:45pm*

**Math**

I have done two parts but no idea how to the third one. The height, h, in meters, of a firecracker fired into the air can be modeled using the function h(t)=-5(x-4)^2+85, where t is the time, in seconds, after the firecracker is fired. c) Use the graph to estimate i) how long ...
*Thursday, February 26, 2015 at 12:45pm*

**math**

At 8 A.M., Dylan and his neighbor, Mickey, drove in their cars to a city that was 240 mi. away from their neighborhood. When Dylan reached the city, Mickey had 40 mi. to go. He finally completed the trip 48 minutes later. a) How long did it take Mickey to drive to the city? b...
*Thursday, February 26, 2015 at 12:37pm*

**math**

Given the equation y equals one third x + 7 what would it be easy y value for the corresponding x value of 18
*Thursday, February 26, 2015 at 12:37pm*

**Math**

–37of the people who live in an apartment building are men. 58of the remaining people are women. The rest are children. A total of 220 men and women live in the building. How many people live in the apartment building altogether?
*Thursday, February 26, 2015 at 12:36pm*

**math**

Jennifer Rick went to Sunshine Bank to borrow $3,500 at a rate of 10¾%. The date of the loan was September 7. Jennifer hoped to repay the loan on January 15. Assume the loan is calculated using ordinary interest. How much will Jennifer totally repay?
*Thursday, February 26, 2015 at 12:27pm*

**Math**

The table below shows the number of students from different classes of two schools who participated in a sports competition: School A 25 21 2 22 20 21 20 23 1 School B 3 2 1 5 4 2 3 4 3 Part A: How can you use box plots to compare the median and interquartile range of the data...
*Thursday, February 26, 2015 at 12:12pm*

**Math**

Find the intersection of the sets A = {3, 4, 7, 9, 13} and B = {3, 7, 10, 13, 17}. null set {3, 7, 13} {3, 4, 7, 9, 10, 17} {3, 4, 7, 9, 10, 13, 17}--- my answer Question 3.3. Choose the correct answer. Find the union of the two sets A = {4, 8, 10, 12, 14} and B = {12, 14}. {...
*Thursday, February 26, 2015 at 12:02pm*

**Math**

Jim wants to borrow some money but wants to find the best deal. Which is his best option using simple interest? Round to 2 decimal places.
*Thursday, February 26, 2015 at 11:40am*

**math**

let V be the set of all real-valued continuous functions defined on R1. If f and g are in V, we define f ¨’ g by (f ¨’ g)(t) = f(t) + g(t). If f is in V and c is a scalar, we define c f by (c f)(t) = cf(t). Then V is a vector space, which is denoted by C(&#...
*Thursday, February 26, 2015 at 11:30am*

**math**

How many real roots exist if the discriminant of the equation=0?
*Thursday, February 26, 2015 at 11:24am*

**math**

i have to find the surface area of a cylinder with the height of 15 and the circumference of 4 to the nearest tenth of a square unit and cannot figure it out HELP PLEASE
*Thursday, February 26, 2015 at 11:20am*

**MATH**

Which method of solving quadratic equations should be used when only an estimated solution is necessary? factoring quadratic formula graphing MY GUESS GRAPHING?
*Thursday, February 26, 2015 at 11:18am*

**Math**

A bookshop has some faction and nonfiction books. 2/5 of. The books are fiction. Of these, 1/5 are mysteries. 1/3 of the. Nonfiction books are mysteries. What fraction of all the books are mysteries?
*Thursday, February 26, 2015 at 11:11am*

**math question**

how is this not a subspace of R3? The set of all vectors of the form a b c , where a > 0.
*Thursday, February 26, 2015 at 11:10am*

**math**

John has $6000 to invest. He invests part of it at 5% and the rest at 8%. How much should be invested at each rate to yield 6% on the total amount?
*Thursday, February 26, 2015 at 10:26am*

**Math!! Help ASAP**

Calculate the slant height for the given cone. Round to the nearest tenth. Diameter=18 cm. Height=7 cm. A.11.2 B.12.5 C.14.8 D.11.4 ******** Correct?!?!
*Thursday, February 26, 2015 at 9:41am*

**math**

Please check Fewer than 45 people attending d the show X<45 A student had $5 but does not have enough to purchas three pair of socks 3x<5 At least 127 students attended the rock concert 127>x No more than 50 students walked in the walkathon X>50
*Thursday, February 26, 2015 at 9:27am*

**math**

Use logarithmic differentiation to find the derivative of the function. y = (x^4 + 2)^2(x^3 + 4)^4
*Thursday, February 26, 2015 at 6:15am*

**Math**

A trapezoid has an area of 91 cm2. If the height is 13 cm and one side is 6 cm, what is the length of the other side?
*Thursday, February 26, 2015 at 6:04am*

**math**

Organizer of school graduation does have three sections of chairs. 1120 chairs are arranged for graduates, 1400 for invited guests and 896 for lecturers. If all rows have same number of chairs, calculate the greatest number of chairs in each row if no chairs are left over? ...
*Thursday, February 26, 2015 at 2:28am*

**Math**

Express the following as a logarithm and simplify. 1. log(3x^2 + 11x - 20) - log(3x - 4) 2. 1/6 log3 27 + log3 18 - log3 2 3. log5 cube root of 625 4. 2loga x^3 + 3loga y + 4loga z - 3logz w
*Thursday, February 26, 2015 at 1:12am*

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