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April 16, 2014

Homework Help: Math

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Recent Math Questions

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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=+.0​6+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

Need 8 grade math help quick please!
Thank you!
Friday, March 28, 2014 at 8:25pm

math
It was in a steel box lined with layers and layers of bubble wrap ( one of the many ways my students use in the contest)
Friday, March 28, 2014 at 8:23pm

math
She would have 56 total. 28 + 28 = 56 So, 56 is the answer.
Friday, March 28, 2014 at 8:17pm

math
samantha has 28 and she gets 28 more how many would she have in all.
Friday, March 28, 2014 at 8:12pm

math
11:10 am
Friday, March 28, 2014 at 7:59pm

Math
The cafeteria has 4 cases of tuna and 9 single cans of tuna. In all,there are 65 can of tuna. How many cans of tuna are in a case? (P.S.-PLEASE SHOW WORK...I NEED HELP!Thank You!)
Friday, March 28, 2014 at 7:49pm

math
A wood burner burns 180 pounds of wood in 5/2 days . How many pounds of wood is needed for the burner in 1 month.
Friday, March 28, 2014 at 7:48pm

math
an real raw egg was dropped from a 20 story height , however it didn't break . How is that possible ? IT LANDED on concreate solid.
Friday, March 28, 2014 at 7:47pm

Math for grade 6 peace
96 = 0.48 x x = 96/0.48
Friday, March 28, 2014 at 7:14pm

math
http://www.jiskha.com/display.cgi?id=139​6046268
Friday, March 28, 2014 at 7:12pm

math help
for 5 days 2/5 + 1/5 + 3/5 = 6/5*5 = 30/5 Sat 3 *4/5 = 12/5 Wed -2/5 for wet Pepper 30/5 + 12/5 - 2/5 = 40/5 = 8 hours
Friday, March 28, 2014 at 7:11pm

Algebra
Only you will know that. It's actually surprising how often basic math skills come in handy. Other than that, the mental skills developed when solving problems are definitely useful later in life, no matter the field of endeavor. Now, if you plan to find a sugar daddy/mama...
Friday, March 28, 2014 at 7:05pm

math help
Enrique charges $5 for every 1/5 hour he spends walking dogs. In the morning he walks Buttons for 2/5 hour, Bruno for 1/5 hour, and Pepper for 3/5 hour, Monday through Friday. On Saturdays he takes Mimi, Diva, and Coco to the dog park for 4/5 of an hour. On Wednesday this week...
Friday, March 28, 2014 at 6:37pm

math
Enrique charges $5 for every 1/5 hour he spends walking dogs. In the morning he walks Buttons for 2/5 hour, Bruno for 1/5 hour, and Pepper for 3/5 hour, Monday through Friday. On Saturdays he takes Mimi, Diva, and Coco to the dog park for 4/5 of an hour. On Wednesday this week...
Friday, March 28, 2014 at 6:35pm

math
Enrique charges $5 for every 1/5 hour he spends walking dogs. In the morning he walks Buttons for 2/5 hour, Bruno for 1/5 hour, and Pepper for 3/5 hour, Monday through Friday. On Saturdays he takes Mimi, Diva, and Coco to the dog park for 4/5 of an hour. On Wednesday this week...
Friday, March 28, 2014 at 6:34pm

math
4 * 6/5 + 4/5 + 1/5 = 29/5 = 5 4/5 hr How did You got 29 /5 where as here when iam calculating its coming 44/5. pls explain
Friday, March 28, 2014 at 6:33pm

math
Since kim ran 20 miles, sam ran HALF as much as Kim. Half = 20 divided by 2. That equals 10!!!
Friday, March 28, 2014 at 6:30pm

Math for grade 6 peace
The computer club is having a fundraiser to help pay for a trip to the science museum. So far they have raised $96, which is only 48% of their goal. How much money are they trying to raise?
Friday, March 28, 2014 at 6:25pm

math
Kara eats 4/5 of the food that Jillian does. If kara needs to bring 14lbs of food for the week, how much does Jillian need to bring.
Friday, March 28, 2014 at 6:05pm

math
Thank you
Friday, March 28, 2014 at 5:27pm

math
MTθF: 6/5 hr Sat: 4/5 hr W 1/5 hr 4 * 6/5 + 4/5 + 1/5 = 29/5 = 5 4/5 hr
Friday, March 28, 2014 at 5:24pm

math help
#2 is ok, but not yet complete: x^2-1 = (x-1)(x+1)
Friday, March 28, 2014 at 5:21pm

math
Enrique charges $5 for every 1/5 hour he spends walking dogs. In the morning he walks Buttons for 2/5 hour, Bruno for 1/5 hour, and Pepper for 3/5 hour, Monday through Friday. On Saturdays he takes Mimi, Diva, and Coco to the dog park for 4/5 of an hour. On Wednesday this week...
Friday, March 28, 2014 at 5:19pm

Math
v = (1/3)pi(r^2)h h = 2.8m r =d/2 = 6.8/2 = 3.4m v = (1/3)pi(3.4)^2(2.8)
Friday, March 28, 2014 at 5:19pm

math help
1. x^2 +2xy +y^2 -a^2-2ab-B^2 2. 6(x^4-1) = 6(x^2-1)(x^2 +1) = 6(x-1)(x+1)(x^2+1)
Friday, March 28, 2014 at 5:14pm

math help
factor: 1) (x+y)^2 - (a+b)^2 = [(x+y) - (a+b)] [(x+y) + (a+b)] = [x+y-a-b] [x+y+a+b] 2) 6x^4 - 6 = 6(x^4 - 1) = 6(x^2-1)(x^2+1) Is this right?
Friday, March 28, 2014 at 5:00pm

Math 20-3
v = 1/3 pi (3.4^2) (2.8) m^3
Friday, March 28, 2014 at 4:43pm

Math
A pile of gravel is conical in shape. If the diameter is approximately 6.8m and the height is 2.8m, what is the volume of gravel in the pile?
Friday, March 28, 2014 at 4:41pm

Math 20-3
A pile of gravel is conical in shape. If the diameter is approximately 6.8m and the height is 2.8m, what is the volume of gravel in the pile?
Friday, March 28, 2014 at 4:39pm

MATH VERY URRRGENT!!!!!!!!!!!!!
LOL...everyone from connexus is looking at this. xD
Friday, March 28, 2014 at 3:23pm

3rd grade math
Cannot draw here. Each person got 1 1/3 pieces.
Friday, March 28, 2014 at 2:23pm

Math
I am guessing that P(number < 2) is supposed to mean probability that the number is less than 2 What number ???? Are you tossing a die ? confirm
Friday, March 28, 2014 at 2:16pm

logic and math
Write the reciprocal and the anti-reciprocal of: That a quadrilateral has 4 equal sides, is a necessary condition for that it is a square. That a triangle has 2 equal sides, is a necessary condition for that it is isosceles. Only if f is integrable in an I interval, f is ...
Friday, March 28, 2014 at 12:50pm

logic and math
Calculate the truth value (f or V) a. Is it true that if (the Papaya is a fruit from the Caricaseas or the Pitahaya is the fruit of a plat from the Cactaseas) then (el Cohombro is a fruit of a plant from the family of the Cucurbitaceas or the Nisper is a fruit of a tree from ...
Friday, March 28, 2014 at 12:47pm

Math
1. P(Number<2) A. 1/6 B. 2/6 C. 4/6 D. 3/6 2. P(Number>3) A.4/6 B.1/6 C.2/6 D.5/ 3. P(Complement of 4) A.1/6 B.5/6 C.2/6 D.4/6 4. A multiple choice question has 5 possible answers. What are the odds in favor of guessing the right answer? A.1:5 B.2:2 C.3:1 D.1:3
Friday, March 28, 2014 at 12:20pm

Math
@Steve: Thank you for the help as well, no there isn't a typo. Sometimes the math we're doing is quite confusing. Thank you for the help. c:
Friday, March 28, 2014 at 11:29am

Math
@Reniy: Yes those were the answers I came up with. I couldn't figure out what I was doing wrong, turns out I was doing the first one right and the second one was a bit off. Thank you for the help.
Friday, March 28, 2014 at 11:23am

geometry
Just go tell your teacher to !@#$%^& off cuz this !@#$%^& is stupid and dont nobody want to do this bull!@#$%^&..
Friday, March 28, 2014 at 11:02am

Language Art (Please Check)
1.C 2.A 3.C 4.C 5.D 6.D 7.B 1.She was rivaling the mayor by A.sending money to him. B.voting for him. C.running against him. 2.In which of the following situations would you be most likely to be caught up in a commotion? A.a riot B.a math exam C.a school assembly 3.Which of ...
Friday, March 28, 2014 at 10:53am

math
we need <x,y> such that <x,y> + <6/√2,6/√2> = <0,-20> Now it's easy to get x and y, and thence the speed and direction.
Friday, March 28, 2014 at 5:51am

Need 8 grade math help quick please!
there is only one number less than 2, and six possible throws. So, P(n<2) = 1/6 Similarly, P(n>=3) = P(n∊{3,4,5,6}) = 4/6 = 2/3 P(n≠4) = 1-P(n=4) = 1 - 1/6 = 5/6
Friday, March 28, 2014 at 5:49am

math
Differentiate cost function and equate it to 0, i.e. 0.1(2x)-1.2=0 or x=1.2/0.2=6; Second derivative is0.2which is+ve hence it corresponds to minimum cost level. Hence x=6,i.e. 600 bikes. Cost/bike for 600 bikes will be =0.1x36-1.2x6+4.993=1.393 hunderd $. For 590 and 610 ...
Friday, March 28, 2014 at 5:17am

Need 8 grade math help quick please!
I don't understand this. I don't get exactly what I'm supposed to do with the P(parenthes) thingy or how each question differs from the next. Theoretical and Experimental Probability: A number cube with the numbers 1 through 6 is rolled. Find the given probability...
Friday, March 28, 2014 at 3:14am

College math
f(x)=x^2+7 upward 8 units
Friday, March 28, 2014 at 2:17am

math
J's bike has determined that when x hundred bikes are built, the average cost per bike is given by C(x)= 0.1x^2-1.2x+4.993, where C(x) is in hundreds of dollars. how many bikes should the shop build to minimize the average cost per bike?
Friday, March 28, 2014 at 1:37am

math
A boat needs to travel south at a speed of 20 km/h. However a constant current of 6 km/h is flowing from the south-east. Use vectors to find: a.the equivalent speed in still water for the boat to achieve the actual speed of 20 km/h. b the direction in which the boat must head ...
Friday, March 28, 2014 at 1:22am

math
j=g j-2055 = g/4 = j/4 3/4 j = 2055 j = 2740
Friday, March 28, 2014 at 12:32am

MATH HELP
If both lines go through (0,0), then one line has slope -2/3, so the other line has slope 3/2. so, s = 2/3
Friday, March 28, 2014 at 12:29am

math 5th
help
Friday, March 28, 2014 at 12:28am

MATH Fractions
thank you it is march and i found this helpful 2 months after your posting!
Friday, March 28, 2014 at 12:25am

Math
a = 2pi*r(r+h) = 2pi*6*26 = 979.68 Hmmm. That includes both ends. The lateral area is a = 2pi*r*h = 2pi*6*20 = 753.6 Is there a typo somewhere? 2pi*6*24 = 904.3, so (D)
Friday, March 28, 2014 at 12:25am

Math
Imagine "opening up" a cylinder, what would you get? 2 equal circles + a rectangle whose length is the circumference of the circle and whose height is the height of the cylinder. so SA = 2π(6^2) + 2π(6)(20) = 72π + 240π = 312π = appr 980 No ...
Friday, March 28, 2014 at 12:23am

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