Monday

April 21, 2014

April 21, 2014

**Branches of Math**

**Recent Math Questions**

Post a New Question | Current Questions

**Math**

A car moves along a straight road in such a way that its velocity (in feet per second) at any time t (in seconds) is given by v(t) = 3t sqrt(64−t^2) (0 ≤ t ≤ 8). Find the distance traveled by the car in the 8 sec from t = 0 to t = 8.
*Monday, April 14, 2014 at 5:08pm*

**Math**

Based on a preliminary report by a geological survey team, it is estimated that a newly discovered oil field can be expected to produce oil at the rate of R(t) = 300t^2/(t^3 + 32)+5 (0 ≤ t ≤ 20) thousand barrels/year, t years after production begins. Find the ...
*Monday, April 14, 2014 at 5:07pm*

**Math**

Find the average value of the function f over the interval [-1, 2]. f(x) = 1 - x^2
*Monday, April 14, 2014 at 5:06pm*

**Math**

Find the average value of the function f over the indicated interval [0, 8]. f(x) = 7/(x + 1)
*Monday, April 14, 2014 at 5:06pm*

**Math**

Find the average value of the function f over the interval [0, 8]. f(x) = 5e^-x
*Monday, April 14, 2014 at 5:05pm*

**Math**

I did my math wrong, I dont know what I was thinking. Thanks for your help.
*Monday, April 14, 2014 at 5:03pm*

**Math**

how many different shapes can you make with the 4 triangles cut from this rectangle? how do you know?
*Monday, April 14, 2014 at 4:39pm*

**3 grade math ms sue**

troooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo&#...
*Monday, April 14, 2014 at 4:36pm*

**Math**

32
*Monday, April 14, 2014 at 3:54pm*

**trying to understand math**

Your store’s average basket (transaction) size for the month of March was $11.50 and you believe the average basket size will remain the same for your store in April. One of your hourly employees had an average basket size of $9.00 for the month of March and averaged 125 ...
*Monday, April 14, 2014 at 3:47pm*

**math**

Yes.
*Monday, April 14, 2014 at 3:42pm*

**math**

1 inch = 2.54 cm
*Monday, April 14, 2014 at 3:40pm*

**math**

Your store’s average basket (transaction) size for the month of March was $11.50 and you believe the average basket size will remain the same for your store in April. One of your hourly employees had an average basket size of $9.00 for the month of March and averaged 125 ...
*Monday, April 14, 2014 at 3:39pm*

**math**

Suppose Maya made another sign with an area of 48 square inches. would this sign be larger or smaller than the sign with an area of 48 square centimeters? Explain how you know.
*Monday, April 14, 2014 at 3:33pm*

**math**

You're very welcome.
*Monday, April 14, 2014 at 3:23pm*

**math**

Thank you so much
*Monday, April 14, 2014 at 3:18pm*

**math**

Right.
*Monday, April 14, 2014 at 3:17pm*

**math**

The sales goal for your store this week is $22,682. The sales goal for your store this week last year was $20,128. Your store has averaged 1775 transactions per week for the last four weeks. Assuming the number of transactions is consistent, what is the average basket size (...
*Monday, April 14, 2014 at 3:14pm*

**math**

The sales goal for your store this week is $22,682. The sales goal for your store this week last year was $20,128. Your store has averaged 1775 transactions per week for the last four weeks. Assuming the number of transactions is consistent, what is the average basket size (...
*Monday, April 14, 2014 at 3:12pm*

**math**

Water flows through a pipe with the inner diameter of 20cm at a speed of 1m/s. How long does it take for the water flowing out from the pipe to fill a cylindrical tank with the base radius of 0.8m and the height of 0.5m?
*Monday, April 14, 2014 at 3:06pm*

**math**

Ale and AMK -- you're both wrong. $258.38 is the average weekly income. But the question asks for the average MONTHLY income. Multiply the average weekly income by 4.33 to find the average monthly income.
*Monday, April 14, 2014 at 2:24pm*

**Math**

3x4 – 4x3 ++ 6x2 – 3x + 4
*Monday, April 14, 2014 at 2:22pm*

**Math**

(6x4 – 3x + 5) – (3x4 + 4x3 – 6x2 + 1)
*Monday, April 14, 2014 at 2:17pm*

**math**

Add all of them together then divide by 4
*Monday, April 14, 2014 at 2:07pm*

**Math help**

An independent variable is the potential stimulus or cause, usually directly manipulated by the experimenter, so it could also be called a manipulative variable. A dependent variable is the response or measure of results. http://www.mathsisfun.com/data/correlation.html
*Monday, April 14, 2014 at 2:01pm*

**math**

Section 1 can be either 36 or 49 sq. ft. Choose one and then work for Section 2. We cannot put a grid on this post.
*Monday, April 14, 2014 at 1:56pm*

**Math**

1. An assessment rate is 47%. The property tax is $39.94 per $1,000. What is the effective tax rate? Round to the nearest tenth of percent. 2. A property tax rate is $7.79 per $100 of assessed value. what is the tax rate as a decimal? Please help.
*Monday, April 14, 2014 at 1:55pm*

**math**

So ... "ale" ... do you know how AMK got that answer?
*Monday, April 14, 2014 at 1:54pm*

**math**

Thank you!
*Monday, April 14, 2014 at 1:50pm*

**math**

$258.38
*Monday, April 14, 2014 at 1:48pm*

**math**

What is the average monthly income for these weekly incomes: $299.34, $203.49, $305.39, and $225.30? This is all the question gives me. Please help.
*Monday, April 14, 2014 at 1:45pm*

**math**

No alternatives given. Cannot copy and paste here. 99% = mean ± 2.575 SEm SEm = SD/√n You do the math.
*Monday, April 14, 2014 at 1:42pm*

**statistics**

If you math is correct, I agree.
*Monday, April 14, 2014 at 1:36pm*

**math**

v1 - 3v2 = (1+2j)-3(1+j) = 1+2j-3-3j = -2-j v1*v2 = (1+2j)(1+j) = 1+3j+2j^2 = -1+3j v1*v1 = (1+2j)(1+2j) = -3+4j v1/v2 = (1+2j)/(1+j) * (1-j)/(1-j) = (3+j)/2 you can practice you skills at wolframalpha.com, but use i instead of j.
*Monday, April 14, 2014 at 1:31pm*

**math**

The side parallel to the highway be x ft let each of the other two sides by y 2x + y = 640 y = 640 - 2x area = xy = x(640-2x) = -2x^2 + 640x I assume you know how to find the vertex of this downwards parabola, and that vertex is (160 , 51200) if x = 160 y = 640 - 2(160) = 320 ...
*Monday, April 14, 2014 at 1:17pm*

**math**

Houston Community College is planning to construct a rectangular parking lot on land bordered on one side by a highway. The plan is to use 640 ft of fencing to fence off the other three sides. What should the dimensions of the lot be if the enclosed area is to be a maximum?
*Monday, April 14, 2014 at 11:28am*

**math**

If z˅1=1+2j and z˅2=1+j find (i) z˅1-3z˅2 (ii) z˅1z˅2 ___ (iii) z˅1z˅1 (iv) z˅1/z˅2
*Monday, April 14, 2014 at 10:18am*

**math**

z is defined in two ways ? what's with the 1 2 ?
*Monday, April 14, 2014 at 9:28am*

**math**

Debit Notes Payable $32,711; credit Cash $32,711.
*Monday, April 14, 2014 at 9:21am*

**math**

If z =1+2j and z =1+j 1 2 find z -3z 1 2
*Monday, April 14, 2014 at 9:08am*

**Math help asap**

I interpreted your question this way: e^(x/2.9099) =ln (7.8x10^10) take ln of both sides , so we taking ln (ln(...)) on the right side x/2.9099 = ln (ln (7.8 x 10^10) ) x/2.9099 = 3.22207 x = 9.3759...
*Monday, April 14, 2014 at 9:05am*

**Math**

11
*Monday, April 14, 2014 at 8:58am*

**math**

Can the equation be expressed in a polar form diagram?
*Monday, April 14, 2014 at 7:56am*

**Math help asap**

E^x/2.9099=ln 7.8x10^10
*Monday, April 14, 2014 at 6:29am*

**math**

A study of 60 bolts of carpet showed that their average length was 180 yards. The standard deviation of the population is 6 yards. Which of the following is the 99% confidence interval for the mean length per bolt of carpet?
*Monday, April 14, 2014 at 6:14am*

**MATH HELP**

2 kg is about 4.5 pounds So, what do you think?
*Monday, April 14, 2014 at 5:24am*

**Math**

I don't know
*Monday, April 14, 2014 at 3:50am*

**MATH HELP**

which of the following is likely to have a mass of 2 kilograms 1.a grown elephant 2. a pineapple 3. a 3 year old child 4. or an acorn
*Monday, April 14, 2014 at 12:19am*

**Math**

call the 2 piles x and y P(x) = 3/5 P(y) = 2/(b+2) 3/5 * 2/(b+2) = 6/45 6 / 5(b+2) = 6/45 5(b+2) = 45 b+2 = 9 b = 7
*Sunday, April 13, 2014 at 11:49pm*

**Math**

Hmmm. we have ∫[0,2] 0.18t^2 + 0.16t + 2.64 = 0.06t^3 + 0.08t^2 + 2.64t [0,2] = .48 + .32 + 5.28 = 6.08 What did you do to arrive at your answer? 1.04 is obviously way off, since f(0) = 2.64 just to start with.
*Sunday, April 13, 2014 at 11:42pm*

**HELP! 5th grade math**

There is more than one way to do this What Alison gave you is one of those. I would use the two containers measuring only Litres to hold the whole numbers e.g. 4 L + 4 L that leaves .53 L or 530 ml now you can split the 530 into any two parts using the two containers that ...
*Sunday, April 13, 2014 at 11:18pm*

**HELP! 5th grade math**

Thank you!! how can i explain to her how to come up with the 2265? I get 2 L and 2L and she will only know that 2L converts to 2000ml how can she figure that leftover out? sorry this stuff totally confuses me :)
*Sunday, April 13, 2014 at 10:56pm*

**Math**

did you notice that the derivative of the denominator is 9 e^(9x) which just happens to be sitting in the numerator as a multiple thereof. Which is the ln derivative pattern. So without any great fanfare..... ∫(e^(9x))/(2 + e^(9x)) dx = (1/9) ln (2 + e^(9x) + c
*Sunday, April 13, 2014 at 10:56pm*

**HELP! 5th grade math**

Liquid A-2L Liquid B-2L Liquid C-2265mL Liquid D-2265mL
*Sunday, April 13, 2014 at 10:50pm*

**Math**

How about giving this one a try ?
*Sunday, April 13, 2014 at 10:50pm*

**oops - Math**

didn't see the "monthly" part rate = .05/12 = .0041666... amount = 125000(1.00416666...)^6 = $128,157.73
*Sunday, April 13, 2014 at 10:49pm*

**Math**

125,000 invested for 6 months = 125000(1.025 = $128,125 So what do you think?
*Sunday, April 13, 2014 at 10:47pm*

**math**

Are you saying f(x) = 17/(x^2 + 4x - 12) ? (I will assume that) = 17/((x+6)(x-2) ) remember we can't divide by zero, which happens if x = 2 or x = -6 We can use any other value of x so domain: = { x ∈ R | x ≠ -6,2 }
*Sunday, April 13, 2014 at 10:45pm*

**HELP! 5th grade math**

Trying to help my child in 5th grade. Shannon pours 4 different liquid ingredients into a bowl The sum of the liquid ingredients is 8.53 liters. Two of her measurements are in milliliters and two of her measurements are in liters. Give an example of possible measurements for ...
*Sunday, April 13, 2014 at 10:43pm*

**Math**

Wilder: amount = 85000(1.05)^2 = $93,712.50 after 1st year Cheapskate: amount = 85000(1.0081666..)^12 = $93,714.53 after 1st year b) you try it, (you only have to change the exponents)
*Sunday, April 13, 2014 at 10:39pm*

**math**

a searchlight is shaped like a paraboloid of revolution. if the light source is located 5 feet from the base along the axis of symmetry and the opening is 8 feet across, how deep should the searchlight be?
*Sunday, April 13, 2014 at 10:37pm*

**Math**

Tom: Paym(1.08)^3 = 15000 Paym = 15000/1.08^3 = $11,907.48 Lana: monthly rate = .07875/12 = .0065625 Paym(1.0065625)^36 = 15000 Paym = 15000/1.0065625^36 = $11,852.89 etc
*Sunday, April 13, 2014 at 10:34pm*

**Math**

a) ridiculous question ! , makes no sense the "arithmetic" would be 8200(1.0988) = .... b) weekly rate = .0988/52 = .0019 number of weeks in 18 years = 936 amount = 8200(1.0019)^936 = $48,465.24
*Sunday, April 13, 2014 at 10:29pm*

**Math**

∫5(1+1/u + 1/u^2) du from 5 to 7 = 5[u + ln u -1/u] from 5 yo 7 = 5( 7 + ln7 - 1/7 - (5 + ln5 - 1/5) = 5(2 + ln7 - ln5 -1/7 + 1/5) = 10 +2/7 + 5ln 7 - 5ln5 = appr 11.97
*Sunday, April 13, 2014 at 10:22pm*

**Math**

Find the indefinite integral. (e^(9 x))/(2 + e^(9 x)) dx
*Sunday, April 13, 2014 at 10:21pm*

**Math**

A company is planning to expand its business in a few years. New plant construction costs are estimated to be $4.75 per square foot. The company invests $850,000 today at 6% compounded quarterly/ a) How many square feet could be built in 3 1/2 years? b) If the company waits ...
*Sunday, April 13, 2014 at 10:20pm*

**math**

Find all numbers that are not in the domain of the function. Then give the domain using set notation? F(x)=________17over xSquare+4x-12
*Sunday, April 13, 2014 at 10:20pm*

**Math**

Richard Simons is selling his house. He has a choice of taking $125,000 today or $135,000 in 6 months. If he takes the money today, he can invest it at Valley Bank at 5% interest compounded monthly. a) How much would be in the account after six month if he took the $125,000. b...
*Sunday, April 13, 2014 at 10:18pm*

**Math**

Jason Printing has $85,000 to invest. They can invest in Wilder Revenue at 10% compounded semiannually or at Cheapskate Investments at 9.8% compounded monthly. a) Calculate the two APYs and compare them to determine your answer. Make sure to distinguish which APY belongs to ...
*Sunday, April 13, 2014 at 10:14pm*

**Math**

Tom and Lana both need $15,000 in 3 years. Tom finds an investment in which he can earn 8% compounded annually. Lana finds an investment in which she earns 7 7/8% interest compounded monthly. Who must invest more money now in order to get $15,000 in 3 years? How much more? ___...
*Sunday, April 13, 2014 at 10:11pm*

**Math**

Josh's grandparents established a college fund for him when he was born. They deposited $8,200 into an account that earned 9.88% interest. Assuming Josh goes to college at age 18, how much money will he have if... a) ... the interest is calculated only once during the ...
*Sunday, April 13, 2014 at 10:08pm*

**math**

You're welcome.
*Sunday, April 13, 2014 at 10:07pm*

**math**

Thank you I was trying to over think that problem.
*Sunday, April 13, 2014 at 10:02pm*

**math**

CD = 8/13 DVE = 5/13
*Sunday, April 13, 2014 at 9:59pm*

**math**

Sue has a list of 8 CDs and 5 DVDs that she wants to buy. Her friends randomly select one item to give her. What is the probability Sue's friend will select a CD? a DVD?
*Sunday, April 13, 2014 at 9:58pm*

**MATH :D**

I got 4,950 but my friend got 365 Start listing them out!!! 8)
*Sunday, April 13, 2014 at 9:30pm*

**Math**

Evaluate the following definite integral. 5(1 + 1/u + 1/u^2)du between, (5,7)
*Sunday, April 13, 2014 at 9:06pm*

**Math**

Annual sales (in millions of units) of pocket computers are expected to grow in accordance with the following function where t is measured in years, with t = 0 corresponding to 1997. f(t) = 0.18t^2 + 0.16t + 2.64 How many pocket computers will be sold over the 2 year period ...
*Sunday, April 13, 2014 at 9:05pm*

**Math 10**

Thanks alot guys! Both of your answers were very helpful.
*Sunday, April 13, 2014 at 8:44pm*

**Math**

Need help on how to solve this problem.. Five cards are chosen from a deck of playing cards and put into a pile. Three of the cards are red and 2 of the cards are black. A second pile is made using 2 red cards and b black cards. One card from each pile is chosen randomly. The ...
*Sunday, April 13, 2014 at 8:10pm*

**Math 203**

At time t = 1,a particle is located at position (x, y) = (4, 3). If it moves in the velocity field F(x, y) = xy − 2, y^2 − 11 find its approximate location at time t = 1.06 (x, y) = ?
*Sunday, April 13, 2014 at 7:54pm*

**math**

A particle moves in a velocity field V(x, y) = <x^2, x+y^2> If it is at position (x, y) = (1, 2)at time t = 5,estimate its location at time t = 5.01.
*Sunday, April 13, 2014 at 7:48pm*

**math**

The director of the center has asked you to design a garden. The director has asked you to design different sections of the garden that meet the following: Section 1 must be shaped like a square. Section 1 must have an area between 26 square feet and 50 square feet. section 2 ...
*Sunday, April 13, 2014 at 7:41pm*

**math**

sinA = 1/2, so tanA = 1/√3 tan(A-B) = (tanA-tanB)/(1+tanAtanB) = (1/√3 - 3/4)/(1+(1/√3)(3/4)) = (25√3 - 48)/39
*Sunday, April 13, 2014 at 7:27pm*

**math**

100 * (1/8)/ (8/12+3/12) = 100 * (1/8) / (11/12) = 100 * (3/24)(22/24) = 100 (3/22) = 13.6%
*Sunday, April 13, 2014 at 7:17pm*

**math**

2/3 = 16/24 1/4 = 6/24 1/8 = 3/24 (3/24) / (25/24) (3/24) * (24/25) = 72/600 = 12/100 = 3/25
*Sunday, April 13, 2014 at 7:17pm*

**math**

Use the given transformation to evaluate the integral. double integral R (x − 8y) dA, where R is the triangular region with vertices (0, 0), (7, 1), and (1, 7). x = 7u + v, y = u + 7v
*Sunday, April 13, 2014 at 7:12pm*

**math**

Right!
*Sunday, April 13, 2014 at 7:10pm*

**math**

Maya chatted online with all her friends for 2/3 of an hour on saturday and 1/4 of an hour on sunday.During that time period she chatted with Paul for 1/8 of an hour. What fraction of the time Maya spent chatting with her friends online was spent chatting with Paul?
*Sunday, April 13, 2014 at 7:09pm*

**math**

my answer is c
*Sunday, April 13, 2014 at 7:05pm*

**math**

60
*Sunday, April 13, 2014 at 6:59pm*

**Math 10**

sure, all you have to do is to find the vertex of this "downwards" parabola. I will assume that you do not know Calculus , so (easiest way): the x of the vertex for y = ax^2 + bx + c is -b/(2a) so for your equation, the t of the vertex is -10/-10 = 1 sub into the ...
*Sunday, April 13, 2014 at 6:57pm*

**Math 10**

that is a parabola (quadratic) 5 t^2 - 10 t - 15 = -h find the vertex by completing the square t^2 - 2 t - 7.5 = -(1/5)(h) t^2 - 2 t = -h/5 + 7.5 t^2 - 2 t + 1 = -h/5 + 8.5 (t-1)^2 = -(1/5) (h - 42.5) so max height at one second of 42.5 meters
*Sunday, April 13, 2014 at 6:55pm*

**math**

I'll be glad to check your answer.
*Sunday, April 13, 2014 at 6:51pm*

**math**

pi D = 3.14159 * 13
*Sunday, April 13, 2014 at 6:49pm*

**math**

1" = 50 miles IS 2" = 100 miles so if 2" is only 25 miles, we will need four times as long a sheet of paper. so 4
*Sunday, April 13, 2014 at 6:49pm*

**math**

I know the average cost of gasoline is 35 cents per gallon is ridiculous, but just a question
*Sunday, April 13, 2014 at 6:45pm*

**math**

pam served her apple pie on a 13 inch diameter dish. she wanted to tie a ribbon around the dish to make it a litlle more festive. how long does the ribbon need to be in order to fit around the dish
*Sunday, April 13, 2014 at 6:42pm*

**math**

Is this about Saudi Arabia?? The last time the price of gas in the U.S. was $0.35 a gallon was in 1970 -- over 40 years ago. https://www1.eere.energy.gov/vehiclesandfuels/facts/2012_fotw741.html I've seen a lot of old questions, but this is absolutely ridiculous!
*Sunday, April 13, 2014 at 6:36pm*

**math**

A map measuring 8" x 10" and drawn to the scale 1" = 50 miles is pasted on a sheet of paper of the same size. Find theleast number of sheets of this paper that would have to be taped together to hold this same map if it were drawn to the scale 2" = 25 miles...
*Sunday, April 13, 2014 at 6:31pm*

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