Sunday

April 20, 2014

April 20, 2014

**Branches of Math**

**Recent Math Questions**

Post a New Question | Current Questions

**Math**

1/2 if a length dimension on the big one is twice the same length dimension on the little one then lengths on the small one are 1/2 those on the big one.
*Sunday, March 30, 2014 at 7:52pm*

**Math**

1cm /50 in = 4 cm/x in x = 200 in
*Sunday, March 30, 2014 at 7:46pm*

**Math**

12/8 = 3/2 = boys/girls boys/total = 3/5 girls/total = 2/5 so that boys/girls = 3/2 so girls /total = 2/5 = girls/400 girls = 800/5 = 160
*Sunday, March 30, 2014 at 7:35pm*

**Math**

100(144/1200) = ?
*Sunday, March 30, 2014 at 7:35pm*

**Math**

The height of an elephant in a scale drawing is 4 cm. The scale in the drawing is 1 cm to 50 in. What is the actual height of the elephant. A. 200 in B. 400 in C. 53.5 in D. 25 in
*Sunday, March 30, 2014 at 7:33pm*

**Math**

A serving of ice cream contains 1200 calories. One hundred forty-four calories come from fat. What percent of the total calories come from fat???
*Sunday, March 30, 2014 at 7:33pm*

**Math**

2.5/5 = 1/2
*Sunday, March 30, 2014 at 7:33pm*

**Math**

In Mrs. Julie's classroom the ratio of boys to girls is 12 to 8. If the entire elementary school has a population of 400 students, how many would you expect to be girls?
*Sunday, March 30, 2014 at 7:30pm*

**math**

0.75x = 22.5 x = 22.5 / 0.75 x = 30.4 gallons is the capacity of the container 30.4 - 22.5 = _______ remaining quarts
*Sunday, March 30, 2014 at 7:30pm*

**Math**

4 * 50
*Sunday, March 30, 2014 at 7:29pm*

**Math**

4 n - 6 = 2 n + 4 2 n = 10 n =5
*Sunday, March 30, 2014 at 7:29pm*

**Math**

just translate the English into Math, 4x - 6 = 2x + 4 then solve for x
*Sunday, March 30, 2014 at 7:29pm*

**math**

22.5 quarts = .75 (total) total = 22.5/.75 we have .25 * total so we have .25 * 22.5/.75 =22.5/3 = 7.5
*Sunday, March 30, 2014 at 7:28pm*

**Math**

The Look Alike Doll Company makes dolls that resemble people. Pam's mom is having a doll made to look alike Pam. Pam is 5 feet tall. The doll will be 2 1/2 feet tall. What is the ratio of the doll's height to Pam's height?
*Sunday, March 30, 2014 at 7:27pm*

**Math**

Jason drew two circles. the diameter of the larger circle is twice the diameter of the smaller circle. What is the ratio of the circumference of the smaller circle to the circumference of the larger circle?
*Sunday, March 30, 2014 at 7:22pm*

**Math**

The height of an elephant is a scale drawing is 4cm. The scale in the drawing is 1 cm to 50 in. What is the actual height of the elephant?
*Sunday, March 30, 2014 at 7:20pm*

**Math**

Four times a number, diminished by 6, yields the same result as twice the same number increased by 4. Find the number.
*Sunday, March 30, 2014 at 7:20pm*

**math**

You have a large container of olive oil. You have used 22 1/2 quarts of oil. Twenty-five percent of the olive oil remains. How many quarts of olive oil remain?
*Sunday, March 30, 2014 at 7:17pm*

**MATH VERY URRRGENT!!!!!!!!!!!!!**

ikr
*Sunday, March 30, 2014 at 6:43pm*

**Math**

Borrowed $14,000.00 at 8% for 90 days.What is the interest?
*Sunday, March 30, 2014 at 6:40pm*

**math**

√(1^2+3^2) = √10 = ?
*Sunday, March 30, 2014 at 5:26pm*

**math**

perimeter is 2(12+16) = 56 side of square is thus 14. So, the area is ? Note that 12*16 = (14-2)(14+2)
*Sunday, March 30, 2014 at 5:24pm*

**math**

After 9 cycles he has made 18 miles On day 10 he swims the last 7 miles.
*Sunday, March 30, 2014 at 5:23pm*

**math**

makes good 2 miles per day after 12 day/night cycles is at the 24 mile mark so he will just make it at dusk on the 25 th day
*Sunday, March 30, 2014 at 5:19pm*

**math**

A piece of rope is in the shape of a 12ft. by 16ft. rectangle. The same rope is then shaped into a square. What is the area of square?
*Sunday, March 30, 2014 at 5:19pm*

**math**

A salmon has to swim 25 miles upstream. It seems 7 miles each day and drifts 5 miles at night. How many days does it take for the salmon to first reach the 25 mile mark?)
*Sunday, March 30, 2014 at 5:15pm*

**Math**

2 = 1.0275^n log 2 = n log 1.0275 n = 25.6 years
*Sunday, March 30, 2014 at 5:06pm*

**Math 110 UOP**

Multiply 28x72 using lattice method. been there done that, see below and please post once HUH, 5^2 = 4^2 +3^2 if that is what you mean
*Sunday, March 30, 2014 at 4:56pm*

**Math 110**

278 = 2*139 139 is a prime number to that is the end ***** 2 ***** 8 **** 1->2 1/4 **** 5/6 ** 7 9->0 0/4 **** 1/6 ** 2 11->1 *** 6 so 2016
*Sunday, March 30, 2014 at 4:54pm*

**Math**

Let the number of played games in the first place be x. Total number of games is therefore x+15. Then 0.6x games were won in the first place. If the extra 15 will be won, then total games won is 0.6x+15=0.8(x+15). Solving this equation. Then solve for x in this equation. The ...
*Sunday, March 30, 2014 at 4:38pm*

**Math**

The population of some countries has a relative growth rate of 2.75% per year. At this rate, how many years (to the nearest tenth of a year) will it take the population to double?
*Sunday, March 30, 2014 at 4:33pm*

**Math 110 UOP**

Multiply 28x72 using lattice method. Find the Pythagorean triple from the given generators p=5 and q=4.
*Sunday, March 30, 2014 at 4:25pm*

**Math 110**

Write 278 as a product of prime numbers. Multiply 28x72 using lattice method.
*Sunday, March 30, 2014 at 4:24pm*

**Math 110**

Multiply 28x72 using lattice method. Write 278 as a product of prime numbers.
*Sunday, March 30, 2014 at 4:23pm*

**math riddle ALGEBRA WITH PIZZAZZ**

Qui fin mio si dėrti mà!!!!
*Sunday, March 30, 2014 at 3:22pm*

**math**

Find the distance between points (1, 6) and (2, 3) to the nearest tenth.
*Sunday, March 30, 2014 at 3:18pm*

**Math**

a = .5 r = .5 a r^(n-1) = .5 * .5(6) = .0078125 That is maybe a pepper corn :) http://www.mathsisfun.com/algebra/sequences-sums-geometric.html
*Sunday, March 30, 2014 at 2:46pm*

**math**

Yes, I wondered about this state's educational achievements as well :)
*Sunday, March 30, 2014 at 2:42pm*

**Math**

your class is conducting an experiment to study geometric sequences. The class forms a line. the first person takes a whole pizza,divides it in half, keeps half, and hands it to the next person. The next people in line do the same with there peices. Which portion does the ...
*Sunday, March 30, 2014 at 2:42pm*

**math**

.56 (11) = 6.16 I have no idea what the standard deviation is so can not do more. If I knew it I would use mean of 6.16 and some standard deviation in: http://davidmlane.com/hyperstat/z_table.html
*Sunday, March 30, 2014 at 2:41pm*

**math**

I don't understand. 0nly 11 capable students in the state???
*Sunday, March 30, 2014 at 2:39pm*

**math**

2. In a certain state, it has been shown that only 56% of the high school graduates who are capable of college work actually enroll in colleges.Find the probability that, among the 11 capable high school graduates in this state, each number will enroll in college. c.At least 4...
*Sunday, March 30, 2014 at 2:34pm*

**math**

11 * 0.56 = 6.26 = 6
*Sunday, March 30, 2014 at 2:09pm*

**math**

A promissory note for $15,000 was written on March 10( for 180 days at 6%. It was discounted on June 15 at 12.5%. Find a) the maturity value b) Maturity date c) term of the discount d) discount amount e) The proceeds.
*Sunday, March 30, 2014 at 1:35pm*

**math**

2. In a certain state, it has been shown that only 56% of the high school graduates who are capable of college work actually enroll in colleges.Find the probability that, among the 11 capable high school graduates in this state, each number will enroll in college at least 4
*Sunday, March 30, 2014 at 1:33pm*

**math**

zza
*Sunday, March 30, 2014 at 1:13pm*

**math**

never mind, it's 5760 counting Stacy and Rogers
*Sunday, March 30, 2014 at 12:59pm*

**math**

Good logic, but I wonder about the .47 in light of P(college) = .56
*Sunday, March 30, 2014 at 12:54pm*

**math**

40320
*Sunday, March 30, 2014 at 12:53pm*

**Math - incomplete**

depends on how many she already has made. If she has made n shots so far, then we need x such that .70n + 1.00x = .75(n+x)
*Sunday, March 30, 2014 at 12:50pm*

**math**

You're kidding, right? 11 capable graduates in the whole state? Anyway, just work it out: P(1) = .56 P(2) = .56*.56 = .56^2 ... P(11) = ?
*Sunday, March 30, 2014 at 12:48pm*

**Math**

just subtract the smaller volume from the larger: 10*10*15 - 7*9*12 = ?
*Sunday, March 30, 2014 at 12:45pm*

**Math **

A glass box shaped like a rectangular prism has with 7 inches length 9 inches height 12 inches is being shipped in a larger box with whipped 10 inches length 10 inches in height 15 inches the space between the glass box on the shipping box will with styrofoam peanuts how many ...
*Sunday, March 30, 2014 at 12:04pm*

**math**

In a certain state, it has been shown that only 56% of the high school graduates who are capable of college work actually enroll in colleges.Find the probability that, among the 11 capable high school graduates in this state, each number will enroll in college. all 11
*Sunday, March 30, 2014 at 11:59am*

**math**

We will need to find the sides angle P = 180 - 60 - 75 = 45° let PQ=x , QR = y , PR = z x/sin75 = y/sin45 = z/sin60 let's assign an arbitrary value of y = 1 to our smallest side using x/sin75 = 1/sin45 we get x = .1.366025 using 1/sin45 = z/sin60 z = 1.224745 so sum of...
*Sunday, March 30, 2014 at 11:42am*

**Math**

Katie makes 70% of her free throws. How many consecutive shots would she have to make to reach 75%
*Sunday, March 30, 2014 at 10:16am*

**math**

I did the exactly 7, follow my steps to get the others. On the less than three, do zero first, then exactly1, and exactly 2, then add those to get less than three.
*Sunday, March 30, 2014 at 10:05am*

**math**

I wonder how anyone can measure who is capable of college work? Exactly what is "college work" anyway? From my observation of all these online students enrolled in "colleges", being told they are doing "college work", and getting "degrees&...
*Sunday, March 30, 2014 at 10:04am*

**math**

In a certain state, it has been shown that only 56% of the high school graduates who are capable of college work actually enroll in colleges.Find the probability that, among the 11 capable high school graduates in this state, each number will enroll in college. a. Exactly 7 b...
*Sunday, March 30, 2014 at 9:32am*

**math**

construct a triangle PQR in which angle Q = 60 degree , angle R = 75 degree and the sum of three sides is 12 cm
*Sunday, March 30, 2014 at 8:52am*

**math**

heck no. a pipe of half the diameter only has 1/4 the area. So, for a given speed of the water, only half the volume is obtained.
*Sunday, March 30, 2014 at 6:29am*

**math**

oops a+3x = 50
*Saturday, March 29, 2014 at 11:01pm*

**math**

If adam is a now, then a - 1/2 = 12 a = 12 1/2 a + x/2 = 2x 12 1/2 + x/2 = 2x 25 + x = 4x x = 25/3 check: 25/6 + 25/2 = 25(2/3) = 2 * 25/3 25/2 + 75/3 = 100
*Saturday, March 29, 2014 at 10:59pm*

**math**

assuming y is in billions, c(y) = 200 + .6y c(8250) = 200 + .6(8250) = 5150 or, 5.2 trillion looks ok to me. (b) subtract their spending from their income.
*Saturday, March 29, 2014 at 10:54pm*

**math**

If the consumption function is C = $200 billion + 0.6Y, (a) How much do consumers spend with incomes of $8.25 trillion? I got 5.2 trillion for this. (b) How much do they save? ??
*Saturday, March 29, 2014 at 8:58pm*

**math**

if 1/2 years ago adam was 12, and 1/2x years from now he will be 2x years old, how old will he be 3x years from now
*Saturday, March 29, 2014 at 8:42pm*

**Math**

ways to choose 5 of the 6 multiple choices = C(9,5) = 126 number of ways to choose 2 of the 6 essay questions = C(6,2) = 15 number of ways to answer the test = 126x15 or 1890 ways
*Saturday, March 29, 2014 at 7:17pm*

**Math**

A physics exam consists of 9 multiple-choice questions and 6 open-ended problems in which all work must be shown. If an examinee must answer 5 of the multiple-choice questions and 2 of the open-ended problems, in how many ways can the questions and problems be chosen?
*Saturday, March 29, 2014 at 7:08pm*

**math**

you have a 2.5 od pipe can you get the same flow from two 1.and a quarter od pipe
*Saturday, March 29, 2014 at 6:57pm*

**math**

I will assume you meant: log3 (2x + 5) = 1 then 2x+5 = 3^1 2x = -2 x = -1 If otherwise, let me know
*Saturday, March 29, 2014 at 6:25pm*

**math**

Solve this equation for x Log3^2x+5 =1
*Saturday, March 29, 2014 at 6:14pm*

**survey math 140**

Number of ways to select 5 of 19 is C(19,5) = 19!/(5!14!) = 11628 most calculators have that function built-in look for something like nCr
*Saturday, March 29, 2014 at 4:45pm*

**math - incomplete**

and the other method is ... ?
*Saturday, March 29, 2014 at 4:39pm*

**Calculus**

Thanks Steve! Finally got this one correct on Math Lab! I am eternally grateful, and have made an account here so I can get help and I have already tried helping others as well. I am very pleased with the service of this site and am glad to have found it :) Hooray!!!
*Saturday, March 29, 2014 at 4:34pm*

**math**

A bag contains 3 red marbles, 3 blue marbles and 3 yellow marbles. Which of the following methods of selecting 2 marbles will have the greater probability of choosing 2 red marbles? Randomly choose a marble don't replace it then randomly choose another marble
*Saturday, March 29, 2014 at 4:24pm*

**survey math 140**

a textbook search is considering 19 books for possible adoption. the committee has decided to select 5 of the 19 for furture consideration in how many way can id do so
*Saturday, March 29, 2014 at 3:37pm*

**math**

1000 * .90 * .90 = ?
*Saturday, March 29, 2014 at 3:09pm*

**MATH**

d
*Saturday, March 29, 2014 at 1:08pm*

**math**

5/4 * 14 = ?
*Saturday, March 29, 2014 at 11:46am*

**math**

(b) Round to nearest two decimal places.
*Saturday, March 29, 2014 at 9:58am*

**math**

Suppose you borrow $1,000 of principal that must be repaid at the end of two years, along with interest of 5 percent a year. If the annual inflation rate turns out to be 10 percent, (a) What is the real rate of interest on the loan? For this I got -5%. (b) What is the real ...
*Saturday, March 29, 2014 at 9:56am*

**math**

1. For n repeated independent trials, with constant probability of success p for all trials, find the probability of exactly x successes in the following exercises.Round your final answers to three decimal places. a.n = 7, p = ¼ , x = 4
*Saturday, March 29, 2014 at 9:08am*

**math**

If true, prove. If false, provide just a counterexample: a. For every function f from nonnegative integers into nonnegative reals, o( f ) = O( f ) −Θ( f ) . (Here, “-“ denotes the set difference: A – B consists of elements in A that are not in B.).
*Saturday, March 29, 2014 at 1:37am*

**Algebra**

If Literature, history and French are your life loves, then algebra probably will not be a great part of your life. But, life consists of a wide variety of experiences, and I guarantee you that some basic math know-how (yes, even including algebra) will make things easier. So...
*Saturday, March 29, 2014 at 12:25am*

**math**

you mean how many zeros I think look at b^2-4ac 49 -16*8 is NEGATIVE so two complex conjugate solutions, NO real solutions
*Friday, March 28, 2014 at 11:41pm*

**math**

how many real number solutions does the equation have y = -4x^2 + 7x - 8 no solutions (is it this one) one solution two solutions infinitely many solutions
*Friday, March 28, 2014 at 11:26pm*

**math**

You are welcome:)
*Friday, March 28, 2014 at 11:16pm*

**Math/precalc**

Sorry tangent period is pi, not 2 pi so (2/3) x = 1 pi x = 3 pi/2 = period
*Friday, March 28, 2014 at 11:13pm*

**Math/precalc**

I do not think amplitude means much for a tangent function which goes to infinity twice a period so I would not say 3 but maybe undefined. when the x term increases to 2 pi from 0 we have gone a period so (2/3) x = 2 pi x = 3 pi when we have gone a period period = 3 pi
*Friday, March 28, 2014 at 11:09pm*

**math**

find the zeros of that parabola, use the + one (I turned the parabola upside down because I like positive x^2 term) .06 x^2 - 9.6 x - 5.4 = 0 use x = [-b +/- sqrt(b^2-4ac) ]/2a while I use wolfram alpha http://www.wolframalpha.com/input/?i=+.06+x^2+-+9.6+x+-+5.4+%3D+0...
*Friday, March 28, 2014 at 11:04pm*

**6th Grade Math**

Blue = 3/10 Red = 4/10 = 2/5 Green = 3/10
*Friday, March 28, 2014 at 11:02pm*

**math**

A model rocket is launched from a roof into a large field. The path of the rocket can be modeled by the equation y = -0.06x^2 + 9.6x + 5.4 where x is the horizontal distance, in meters from the starting point on the roof and y is the height in meters of the rocket above the ...
*Friday, March 28, 2014 at 10:49pm*

**math**

Thank you omygosh you guys saved me!
*Friday, March 28, 2014 at 10:46pm*

**math**

h ( t ) = a t ^ 2 + b t + c h ( t ) = – 16 t ^ 2 + 20 t + 2 a = - 16 b = 20 c = 2 t - coordinate of minimum point t = - b / 2 a t = - 20 / [ 2 * - 16 ) ] t = - 20 / - 32 = 20 / 32 = 4 * 5 / ( 4 * 8 ) = 5 / 8 = 0.625 h - coordinate of minimum point h = - ( b ^ 2 - 4 a c...
*Friday, March 28, 2014 at 10:41pm*

**math**

assume no calculus allowed thus complete he square to find the vertex of this parabola 16 t^2 - 20 t - 2 = -h 16 t^2 -20 t = - h + 2 t^2 - 5/4 t = - h/16 + 1/8 t^2- 5/4 t+ 25/64 = -h/16 + 8/64 + 25/64 (t - 5/8)^2 = -(1/16)(h - 33/4) so in 5/8 of a second it reaches the vertex ...
*Friday, March 28, 2014 at 10:37pm*

**Math/precalc**

What is the period and amplitude of y=3tan(2/3x-pi/6)? Thanks!
*Friday, March 28, 2014 at 10:26pm*

**math**

A ball is thrown into the air with an upward velocity of 20 ft/s. Its height (h) in feet after t seconds is given by the function h(t) = –16t^2 + 20t + 2. How long does it take the ball to reach its maximum height? What is the ball’s maximum height? Round to the ...
*Friday, March 28, 2014 at 10:09pm*

**Math**

Which pair of numbers is equilvalent to 47.5% A.475/100,0.475 B.475/100,475 C.475/1000,4.75 D.475/1000,0.475
*Friday, March 28, 2014 at 9:41pm*

**Math**

4 x + 9 = 65 subtract 9 from both sides 4 x = 56 divide both sides by 4 x = 14
*Friday, March 28, 2014 at 8:27pm*

**math**

180 lbs/2.5 days = 72 lbs/day 72 lbs / day * 30 days = 2160 lbs about one ton, two half ton pickups full
*Friday, March 28, 2014 at 8:26pm*

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