Friday

November 28, 2014

November 28, 2014

**Branches of Math**

**Recent Math Questions**

Post a New Question | Current Questions

**math**

kamala had 5026 grams of flour in a canister. she bought a 4157 gram bag of flour. she poured some flour from the bag to the canister. as a result, the mass of the flour in the canister is now twice the mass of the flour left in the bag. how much flour is in the bag now?
*Friday, October 31, 2014 at 9:04am*

**Math**

How do i find the length of a projection of a vector A=3x+y+2z on the xy plane? and how do i find the unit vector in the xy plane that is perpendiculer to vector A?
*Friday, October 31, 2014 at 8:25am*

**Math**

Randolph runs a home appliance repair business and charges a service call fee of $85 plus $15 per half hour for his labour. Write an equation for calculating the total charges, C, in terms of hours of labour, H. Plot the graph of C vs. H and define the slope and C-intercept of...
*Friday, October 31, 2014 at 7:42am*

**Math**

a) prove the identity: Ax(BXC)=B(A*C)-C(A*B) A,B,C vectors x- cross product *-dot product b) use part a) to prove that cross product is not associative.
*Friday, October 31, 2014 at 4:13am*

**Math Please Check**

Please tell me if this are right. Thank you! Find the exact location of all the relative and absolute extrema? h(t) = t^3 - 3t^2 domain: [-1, + infinity) For this one I got x=2 as the minimum, and x=0 as the maximum. g(t) = 3t^4 - 16t^3 + 24t^2 +1 domain: (-infinity, +infinity...
*Thursday, October 30, 2014 at 11:00pm*

**math**

How can u write a unit rate if a least one term is a fraction? How is this different from writing a unit rate where both terms are whole numbers?
*Thursday, October 30, 2014 at 10:52pm*

**Math**

show how to make one addend the next tens number and complete the new addtion sentence. This question has cubes but it also has 22+49= ___+____=
*Thursday, October 30, 2014 at 10:37pm*

**math thanks for your help**

let f(x)=-4x+7. find and simplify f(n) f(n)=_____ simplify your answer
*Thursday, October 30, 2014 at 10:29pm*

**Math**

6 km to miles and the nearest yard? 6km*1mi/1.609km=3mi But how do I get to the yards from converting because my data booklet doesn't tell me 1yd=?km.
*Thursday, October 30, 2014 at 10:24pm*

**math**

Karen collects 6/7 quart of rainwater. She uses ½ of the water to clean her bicycle and uses the remaining water equally for 3 houseplants. What volume of water does she use for each houseplant?
*Thursday, October 30, 2014 at 9:42pm*

**math**

after 3/4 of a minute a sloth has move just 3/8 of a foot. what is the sloth,s speed in feet per minute?
*Thursday, October 30, 2014 at 9:35pm*

**Math 11**

A triangular pyramid has faces that are all equalatetal triangles. Each side length is 16 cm. What is the surface area of the pyramid?
*Thursday, October 30, 2014 at 9:05pm*

**math**

let f(x)=-5x+6 find and simplify f(x+2) f(x+2)=___
*Thursday, October 30, 2014 at 9:05pm*

**Math **

916:3= 305
*Thursday, October 30, 2014 at 9:04pm*

**math really need help!**

let f(x)=-5x+6 find and simplify f(x+2) f(x+2)=___
*Thursday, October 30, 2014 at 8:58pm*

**math**

It is greater than 43ànd less than 52. If you add the digits. The sum is 8 write the number word
*Thursday, October 30, 2014 at 8:32pm*

**math please help**

let f(x)=-5x+6 find and simplify f(x+2) f(x+2)=____
*Thursday, October 30, 2014 at 8:21pm*

**Math-urgent-**

What's 11/12 divided by 3/4 in repeated subtraction?
*Thursday, October 30, 2014 at 8:20pm*

**Math**

if 150 vehicles passed luann how many more minivans than cars would you expect to pass her assume the rate continues
*Thursday, October 30, 2014 at 7:11pm*

**math**

kaya is making dream catchers. each dream catchers uses 6 feathers. she makes 4 dream catchers with black feather 3 with brown 1 with white and 2 with gray. what fraction of the dream catcher have either black or brown feather
*Thursday, October 30, 2014 at 6:54pm*

**math**

there are boxes of tangerines each box has 93 tangerines the Tangerines will be divided equally among 9 classrooms how many tangerines will each classroom get
*Thursday, October 30, 2014 at 5:58pm*

**Math**

if a flagpole is 20ft tall and casts a shadow of 27ft how tall is a building that casts a shadow of 185ft? write a proportion and solve. round your answer to the nearest foot.
*Thursday, October 30, 2014 at 5:52pm*

**7th grade math**

Can you check my answers? 1. 48lbs 6oz - 19lbs 9oz = 47lbs 22oz - 19lbs 9oz Ans: 38lbs 13oz 2. 3weeks 5days x 8 = 24weeks 40days; 40days=8weeks Ans: 32weeks 3. 49 people are in line to see a movie. 17 are in front of Jackie. How many are behind her? 49 - 18 = 31 Ans: 31 people...
*Thursday, October 30, 2014 at 5:48pm*

**Math**

Write the slope intercept form fo an equation of the line that passes through the given point and has the given slope 1. Point (1,1) Slope 1/4 Formula y-y1=m(x-x1) Answer : y=1/4x+0
*Thursday, October 30, 2014 at 5:46pm*

**Math**

equation is J=0.15h J=total cost, h=hats How much would it cost to buy 10 hats? calculate the total cost and show how you got the answer. would it be J=0.15*10 ? thank you
*Thursday, October 30, 2014 at 5:45pm*

**Physics Math**

A flat-bottom river barge is 30.0 ft wide, 85.0 ft long, and 15.0 ft deep. (a) How many ft3 of water will it displace while the top stays 3.00 ft above the water? (b) What load in tons will the barge contain under these conditions if the empty barge weighs 160 tons in dry dock?
*Thursday, October 30, 2014 at 5:42pm*

**Math**

Arrange the following real numbers in order from greatest to least: 0.8, 0.8(repeating 8), 0.89(repeating 89), 0.889( repeating the second 8 and 9), and 0.88. I think I got it, but just want to make sure.
*Thursday, October 30, 2014 at 5:35pm*

**math**

f(x)= x^3 - 2x^2 - 21x - 18 all possible rational zeros # of possible positive zeros # of possible negative zeros find all the real zeros
*Thursday, October 30, 2014 at 5:21pm*

**math**

a box of chalk and 2 staplers costs $10. 3 boxes of chalk and 2 staplers costs $18. find total cost of 1 box of chalk and 1 stapler
*Thursday, October 30, 2014 at 5:06pm*

**math**

two types of sandwiches were made for a tea party. 55% of the sandwiches were cheese sandwiches and the rest were chicken. If there were 252 chicken sandwiches, how many sandwiches were made altogether?
*Thursday, October 30, 2014 at 4:40pm*

**Math**

You have a recipe for homemade cookies that makes 5 batches.if the recipe calls for 3 and 1/3 cups of milk, how much milk would you need to make 1 batch?
*Thursday, October 30, 2014 at 4:34pm*

**math**

there are 6 purple socks and 4 orange socks in a drawer. zucky picked one sock without looking and then another without looking or replacing the first. what is the probability that he picked 2 purple socks?
*Thursday, October 30, 2014 at 4:11pm*

**Math**

x + 3 = 1 2 5 4 what is x?
*Thursday, October 30, 2014 at 3:57pm*

**Math**

X/2 + 3/5 = 1/4
*Thursday, October 30, 2014 at 3:27pm*

**Math/Physics**

The potential at the surface of a sphere (radius R) is given by V_0 = k cos 3theta where k is constant. Find the potential inside and outside the sphere as well as the surface charge density (lower case sigma(theta)) on the sphere. (assume there is no charge inside or outside ...
*Thursday, October 30, 2014 at 3:14pm*

**Math/Physics**

My question is this: The potential at the surface of a sphere (radius R) is given by V_0 = k cos 3theta where k is constant. Find the potential inside and outside the sphere as well as the surface charge density (lower case sigma(theta)) on the sphere. (assume there is no ...
*Thursday, October 30, 2014 at 2:45pm*

**Math**

Solve the quadratic function y=2x^2-14x -16 by completing the square. Round roots to the nearest hundredth, if necessary. Show your work.
*Thursday, October 30, 2014 at 1:43pm*

**MATH**

How many 134foot pieces of ribbon can be cut from a piece of ribbon that is 36 feet long?
*Thursday, October 30, 2014 at 1:43pm*

**math **

what is the maximum speed of a stationary bike set at a constant resistance rate of 2 kilopounds? how far could you travel in 12 minutes and 54 seconds?
*Thursday, October 30, 2014 at 12:42pm*

**Math--1 question? **

For which set of data is the median 15? 89, 75, 90, 15, 74, 88, 89 23, 35, 77, 81, 64, 15, 44 14, 15, 15, 15, 18, 18, 19, 19, 20 8, 20, 17, 21, 14, 15, 9
*Thursday, October 30, 2014 at 12:20pm*

**MATH ASAP**

identify the underlined place in 63.264. Then round the number to that place. thousandths; 63.26 hundredths; 63.26 hundredths; 63.27 thousandths; 63.27 2. The average annual rainfall in Miami, Florida is 61.93 inches. The average annual rainfall in Indianapolis, Indiana is 42....
*Thursday, October 30, 2014 at 12:09pm*

**Math question**

7. What is the best measure of central tendency for the data? What answer do you get using this measure? red blue green brown red pink orange mode; red median; green mean; red mode; pink
*Thursday, October 30, 2014 at 11:44am*

**Math help!**

Point E is located at (-2,2) and point F is located at (4,-6). What is the distance between points E and F? A. square root 52 B. square root 28 C. 10 D. square root 20 Is the answer A? Thank you
*Thursday, October 30, 2014 at 10:37am*

**Math**

A marine biologist is testing a new under water probe. The probe is catapulted from the ship into the air, descends under water to a predetermined depth, and then returns to the surface where it can be collected. The function that models the probe’s path is f(x) = 15t2...
*Thursday, October 30, 2014 at 10:00am*

**Math help!**

Which of the triangles described in the table is a right triangle. Table Triangle Q, Side 1=25 Side 2=10 Side 3=15. Triangle R, Side 1=26 Side 2=20 Side 3=46. Triangle S, Side 1=25 Side 2=20 Side 3=1,025. Triangle T, Side 1=25 Side 2=26 Side 3=650. A. Q B. R C. S D. T Is the ...
*Thursday, October 30, 2014 at 9:43am*

**Math help!**

The length of the hypotenuse of a right triangle is 13 m. The length of one leg is 5 m. Find the length of the other leg. A. 14 cm B. 144 cm C. 8 cm D. 12 cm Is the answer C? Thank you
*Thursday, October 30, 2014 at 9:29am*

**Math help!**

Find the length of the hypotenuse of a right triangle with legs of 9 cm and 12 cm. A. 8 cm B. 21 cm C. 15 cm D. 225 cm Is the answer C? Thank you
*Thursday, October 30, 2014 at 9:10am*

**math**

Katrina is studying the effect of foreign substances on bacteria populations. If she introduces a beneficial substance, such as food, the bacteria population grows. If she introduces a harmful substance, such as a poison, the bacteria population decreases. The function f(x) = ...
*Thursday, October 30, 2014 at 8:50am*

**business math**

6 less than 1/4 of c translated into a expression
*Thursday, October 30, 2014 at 1:47am*

**Math**

Nathan is designing a box to keep his pet newt in. To make the box, he’s going to start with a solid rectangle and cut squares with sides x cm in length from each corner, as shown in the picture below. The dimensions of the of the solid rectangle are 51 cm by 45 cm. The ...
*Thursday, October 30, 2014 at 12:35am*

**Math**

150 men live in a certain town: 85 are married 70 have a cell phone 75 own a car 55 are married and have a cell phone 35 have a cellphone and a car 40 are married and have car 30 are married, have a car and have a cellphone. How many men are single and do not have a car? How ...
*Thursday, October 30, 2014 at 12:32am*

**math **

Please help I'm so confused!!!! 1. Which two square roots are used to estimate the square root of 5? a. square root of 1 and 2 b. square root of 2 and 4 c. square root 4 and 9 d. square root of 9 and 16 2.Which two square roots are used to estimate square root of 43? a. ...
*Wednesday, October 29, 2014 at 10:44pm*

**math**

What is the d value of the following arithmetic sequence? 5, 2, -1, -4, -7,… A. 3 B. -3 C. 4 D. -4
*Wednesday, October 29, 2014 at 10:31pm*

**math**

Find the first arithmetic mean between 100 and 135 given the following sequence: ..., 100, ___, ___, ___, ___, 135, ... A. 107 B. 114 C. 121 D. 128
*Wednesday, October 29, 2014 at 10:30pm*

**Math**

What is the equation and the answer to717✖451
*Wednesday, October 29, 2014 at 9:48pm*

**Math**

What is the equation 745✖876
*Wednesday, October 29, 2014 at 9:09pm*

**math**

suppose February has 29 days. Explain how you can find how many days there are in the year without counting or adding. explain an example please....
*Wednesday, October 29, 2014 at 8:49pm*

**math**

A biker traveling with a velocity of 80 feet per second leaves a 100 foot platform and is projected directly upward. The function modeling the projectile motion of the biker is s(t)=-16t^2+80t+100,where s(t) is the height and t is the number of seconds the biker is in the air...
*Wednesday, October 29, 2014 at 8:42pm*

**Math**

how do I find out how to list 7/10, 5/8, and 3/7 from greatest to least
*Wednesday, October 29, 2014 at 8:40pm*

**math**

A manufacturing company finds that the daily cost of producing x items of a product is given by c(x)=210x + 7000. Find x using calculus
*Wednesday, October 29, 2014 at 8:30pm*

**math**

of the students in ms Martinez class 11/24 walk to school. another 3/8 of the students ride their bikes to school. what fraction more of students walk than ride their bikes to school.
*Wednesday, October 29, 2014 at 8:29pm*

**Math**

How would you estimate 566 divided by 81?
*Wednesday, October 29, 2014 at 8:16pm*

**math**

I spent 2/3 of my money at store A. I spent 1/3 of my money at store B. When I left store B I had $4. How much money did I have when I entered store A?
*Wednesday, October 29, 2014 at 8:10pm*

**currency exchange/ math **

Timothy sold US$130 to a bank when the exchange rate was C$1 = US$0.9315. The bank charged him a commission of 0.55%. How many Canadian dollars did he receive from the bank for US$130?
*Wednesday, October 29, 2014 at 7:55pm*

**math**

For 9- complete the operation and explain why you placed the decimal point where you did. 9. 1.8*0.3=
*Wednesday, October 29, 2014 at 7:54pm*

**math**

Anna is twice as old as Julian.five years ago,eye was three times as old .let x be julian`s present age write an equation for x and find the present ages of Anna and julian
*Wednesday, October 29, 2014 at 7:54pm*

**math**

Jordan bought 6 8/10 yards of pink ribbon and 3 1/4 yards of purple ribbon. how much more pink ribbon than purple ribbon did she buy.
*Wednesday, October 29, 2014 at 7:49pm*

**math**

George cycles to go half the distance at 4m/s but slows to 3m/s for the second half of his trip.he takes 35minutes to complete the trip.find the distance he travels
*Wednesday, October 29, 2014 at 7:41pm*

**math**

Frances walks half the distance at 5km/h and ru the other half at 10km/hit the total time for her journey is 3 hours,what is the distance
*Wednesday, October 29, 2014 at 7:37pm*

**Math**

Limit as n goes to infinity of ((2n)!/(n^n)).
*Wednesday, October 29, 2014 at 7:34pm*

**math**

Anthony is twice as old as Julian.5years ago,he was three times as old .let x be julian`s present age find the present ages of anthony
*Wednesday, October 29, 2014 at 7:33pm*

**math**

The drama club has $500 to put on a play. The club can spend up to 3/8 of the money on new costumes. How much money can they spend on other supplies?
*Wednesday, October 29, 2014 at 7:33pm*

**math**

Chris is determining the amount of raisins he will use for a raisin bread recipe. The ratio of cups of raisins: number of loaves Chris used is 3 raisins to 2 loaves. Which ratio is equivalent to the rate of raisins to loaves of bread that Chris can use?
*Wednesday, October 29, 2014 at 6:29pm*

**Math**

A bike is in fourth gear. When the pedals turn 3 times, the rear wheel turns 7 times. When the pedals turn twice, how many times does the rear wheel turn?
*Wednesday, October 29, 2014 at 5:51pm*

**Math**

Find the radius of a sphere with a volume of 1,767.1 m (3 cubed) would I use the formula V=4/3*pie*radius (3 cubed)
*Wednesday, October 29, 2014 at 5:34pm*

**math- bc calc**

a building is 36 ft tall. A pulley is attached to the top of the building. A rope is looped through the pulley. One end of the rope is attached to the lantern that hangs vertically parallel to the side of the building. The rope passes up vertically from the lantern, through ...
*Wednesday, October 29, 2014 at 3:10pm*

**Math**

Each digit in the division example has been replaced with the same letter throughout. (r stands for remainder.) The digits used wher 1,2,3,4,5,7,and 9. Find the numbers SU rE ------ )CAN -CU ------- IN - IU ------- E
*Wednesday, October 29, 2014 at 2:25pm*

**Math**

Dominick is in charge of ordering supplies for harry's hamburger stand. hamburger buns come in packs of 12 and frozen hamburger patties come in packages of 20. he must have the same amount of rolls as patties. What is the least number of packages of each that he must order.
*Wednesday, October 29, 2014 at 2:10pm*

**Math**

Solve (x+4)(x-9)=0
*Wednesday, October 29, 2014 at 1:14pm*

**Math**

A projectile is shot vertically into the air. Its height, h, in metres, after t seconds is approximately modelled by the relation h=-5t^2+120t+125: c) For how many seconds is the projectile in the air? (1 mark)
*Wednesday, October 29, 2014 at 1:11pm*

**Math**

Mary is twice as old as Jane,the sum of squeres of their age is 125.How old is Jane?
*Wednesday, October 29, 2014 at 1:07pm*

**Math**

The formula l=8t^2/pi^2 represents the swing of a pendulum. In this formula, l is the length of the pendulum, in feet, and t is the time, in seconds, it takes to swing back and forth once. Whst is the length of a pendulum that makes one swing in 2s? Please help!! Thank you for...
*Wednesday, October 29, 2014 at 12:26pm*

**math algeba**

Need to simplify scientific notation.(8.76x109(6.52x10-3(13.27x10-5)
*Wednesday, October 29, 2014 at 12:11pm*

**MATH FOR THE OFFICE**

THE BEGINNING OF THE WEEK A STOCK SOLD 29 3/8 PER SHARE AT THE END OF THE SAME WEEK IT SOLD FOR 31 2/8 WHAT WAS THE AMOUNT OF INCREASE PER SHARE?
*Wednesday, October 29, 2014 at 11:09am*

**Math Help Please! ASAP!**

Solve each inequality 1. y+5>7 y<2 y<12**** y>2 y>12 2. p+12>9 p>21 p>3 p>-21 p>-3**** Are my answers correct?
*Wednesday, October 29, 2014 at 11:08am*

**math**

from a boat, the angle of elevation of the foot of a lighthouse on the edge of a cliff is 34 degrees. if the cliff is 150m high, how far from the base of the cliff is the boat
*Wednesday, October 29, 2014 at 5:13am*

**math**

Triangle ABC has coordinates A(1,4);B(3,-2);and C(4,2).Find the coordinates of the image A'B'C'?
*Wednesday, October 29, 2014 at 1:24am*

**Math Physics**

Find the water pressure at ground level to supply water to the third floor of a building 8.00 m high with a pressure of 325 kPa at the third level So the given is h=8.00 Ptop=325kPa Density water = 1000 Would I need to set it up like 325+1000*9.81*8.00
*Tuesday, October 28, 2014 at 11:09pm*

**Math Demand Functions**

Given the function q=D(x)=k/x^n where k is a positive constant and n is an integer greater than 0. How would you find the elasticity of the demand function After you find the der. what do you do?
*Tuesday, October 28, 2014 at 10:57pm*

**Math**

Find x-value of all points where function has relative extrema and find the Values of these extrema. f(x)= (x^2)/(ln(x))
*Tuesday, October 28, 2014 at 10:25pm*

**Math**

Is the following statement always, sometimes, or never true for numbers greater than zero: "In equivalent ratios, if the numerator of the first ratio is greater than the denominator of the first ratio, then the numerator of the second ratio is greater than the denominator...
*Tuesday, October 28, 2014 at 10:14pm*

**math**

0.205 or 0.21
*Tuesday, October 28, 2014 at 10:06pm*

**Math**

Please help..not wanting answer just where to start... A cylinder has a radius of 5 centimeters and a height of 12 centimeters. What would the height of a cone need to be if it is the same volume and radius?
*Tuesday, October 28, 2014 at 9:01pm*

**Math **

14 boys play basketball, 12 boys play soccer, 16 boys play baseball. How many boys play basketball, soccer, or baseball?
*Tuesday, October 28, 2014 at 8:42pm*

**Math**

javia ran 8 laps around a track to run a total of 1 mile on monday. How many laps will she need to run on tuesday to run 3/8 of a mike?
*Tuesday, October 28, 2014 at 8:31pm*

**Math**

If you had 4 cakes each cut in tents by noon 4\5 We're sold how many pieces were sold by noon
*Tuesday, October 28, 2014 at 8:26pm*

**math**

Jill's fish weighs 8 times as much as her parakeet. Together, the pets weigh 63. How much does the fish weigh? This is 4th grade .
*Tuesday, October 28, 2014 at 7:53pm*

**Math**

A cylinder has a radius of 5 centimeters and a height of 12 centimeters. What would the height of a cone need to be if it is the same volume and radius?
*Tuesday, October 28, 2014 at 7:51pm*

**math**

If two triangles are similar one is 16 by 6 the other 5 by?
*Tuesday, October 28, 2014 at 7:30pm*

**math**

Can you write3+5+6=14 as a multiplicacion sentence? Explain.
*Tuesday, October 28, 2014 at 7:13pm*

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