Wednesday

April 23, 2014

April 23, 2014

**Branches of Math**

**Recent Math Questions**

Post a New Question | Current Questions

**math**

the sum of the angles in a triangle is 180 degrees. A+3A+8A=180 12A=180 A=15 B=3A=45 deg
*Saturday, April 19, 2014 at 5:12pm*

**Math**

p% = p/100 so (p/100) ( ? ) =12 since we only want the 12 to remain on the left side my ( ? ) must be 100(12)/p or 1200/p check: (p/100) * (1200/p) = 12
*Saturday, April 19, 2014 at 5:07pm*

**Math**

x = 2y/3 y = z/3 z = 3y = 3(3x/2) = 9x/2 = 450% X
*Saturday, April 19, 2014 at 5:02pm*

**Math**

A - Give yourself an example and see which way is correct e.g. start with 5/8 now add 1 to both top and botto ---> 6/9 Is the value the same ???? B. Again, test with an example C. start with 5 , 5^2 = 25 mmmhh? how about 1/3 , what is (1/3)^2 or 1/9 compared with 1/3 Hint: ...
*Saturday, April 19, 2014 at 5:01pm*

**math**

r^2 = k V k = r^2/V if you multiply r by 9, then V by 81 k = (9r)^2/81V = r^2/V so e
*Saturday, April 19, 2014 at 4:59pm*

**Math**

X=66 2/3%Y Y=33 1/3%Z Z=(?)%X Please show work. A.16 2/3 B.22 2/9 C.45 D.300 E.450
*Saturday, April 19, 2014 at 4:44pm*

**Math**

The value of 12 is obtained by multiplying p% by A.12 B.12/p C.p/12 D.1200/p E.100p/12 Is there any work for this?, if so please show work.
*Saturday, April 19, 2014 at 4:42pm*

**Math**

pg.3 18.Which, if any of the following statements is always true? A. If the numerator and the denominator of a fraction are increased or decreased, by the same amount, the value of the fraction is unchanged. B. If the numerator and the denominator of a fraction are squared, ...
*Saturday, April 19, 2014 at 4:40pm*

**math**

a) y = 1 x - 3 slope = m = 1 slope of perpendicular = -1/m = -1/1 = -1 so y = -x + b 2 = -3 + b b = 5 so y = -x + 5 do the other the same way
*Saturday, April 19, 2014 at 4:35pm*

**Math**

Second x First 2x Third 3x 2x + 3x + x = 120 6x = 120 x = 20 third 60 Second 20 First 40
*Saturday, April 19, 2014 at 4:18pm*

**Math **

a 120 foot long rope is cut into 3 pieces. the first piece of rope is twice as long as long as the second piece of rope. the third piece of rope id 3 times as long as the second piece of rope. what is the length of the longest piece of rope
*Saturday, April 19, 2014 at 3:48pm*

**math**

Determine the equation of the lines perpendicular to the given lines and passing through the given points:(a)y-5x+3=0;(3,2) (b) y=8-7x;(-3,-4)
*Saturday, April 19, 2014 at 3:28pm*

**Math**

* a circle has . . .
*Saturday, April 19, 2014 at 3:25pm*

**Math**

But a circle is curved, and triangles has straight edges. http://www.google.com/search?q=hexagon&biw=1517&bih=714&tbm=isch&imgil=ER57nZqRDLf9pM%253A%253Bhttps%253A%252F%252Fencrypted-tbn3.gstatic.com%252Fimages%253Fq%253Dtbn%...
*Saturday, April 19, 2014 at 2:45pm*

**Math**

If six equilateral triangles are placed side by side so that only two sides of each triangle touch one of the other triangles what shape is formed? We are thinking circle?
*Saturday, April 19, 2014 at 2:30pm*

**math - steve?**

*Saturday, April 19, 2014 at 2:25pm*

**math**

it doesnt say, this is what it EXACTLY sais: 4. The number cube shown is rolled and the spinner shown is spun. Find P(an odd number and yellow). then it has a picture of a cube, 1 on the top, five on the front and 3 on the side. (but i had another question like this, and it ...
*Saturday, April 19, 2014 at 2:19pm*

**math - incomplete**

if a six-sided cube is numbered to 5, what's missing? Or is it numbered 0 to 5?
*Saturday, April 19, 2014 at 2:13pm*

**oops, my NAME is skatingdj and the subject is MATH**

*Saturday, April 19, 2014 at 2:10pm*

**english**

There's a difference between showing a student how to do a few math problems and doing a reading, thinking, and writing assignment. We assume you know how to read, write, and think, so we give you some ideas, but we don't do the entire assignment.
*Saturday, April 19, 2014 at 2:10pm*

**english**

If math questions can be answered y can't u answer the english ones
*Saturday, April 19, 2014 at 2:07pm*

**math**

If r = square root 3V/pi*h , by what number must we multiply V in order to multiply r by 9 ? a. 3 b. 9/2 c. 9 d. 18 e. 81 please answer and explain
*Saturday, April 19, 2014 at 2:01pm*

**math**

In triangle ABC, angle B = 3, angle A and angle C = 8 angle A. How many degrees are there in angle B ? a. 15 degree b. 30 degree c. 45 degree d. 60 degree e. 120 degree please answer and explain
*Saturday, April 19, 2014 at 1:57pm*

**math**

c = 2 pi r 30 = 2 pi r r=15 a= pi r^2 = pi 25^2 = 225 pi thank you
*Saturday, April 19, 2014 at 1:52pm*

**math**

thank you
*Saturday, April 19, 2014 at 1:44pm*

**math**

h^2 + 75 = 100 h^2 = 25 h = 5 5 x 5 square root 3 /2 =25 square root 3 /2 = 12.5 square root 3 answer e right?
*Saturday, April 19, 2014 at 1:43pm*

**math**

72 is 1/5 of 360, a full circle. So, 5 * 6pi = 30pi and is the full circumference since c = 2pi r, r = 15 since a = pi r^2, a = 225 pi
*Saturday, April 19, 2014 at 1:43pm*

**math**

exactly (4x)^2 = 16v^2
*Saturday, April 19, 2014 at 1:41pm*

**math**

Arc AB of circle O contgains 72 degree and is 6 pi long. Find area of circle O. a. 9 b. 36 c. 30 pi d. 225 pi e. 900 please answer and explain
*Saturday, April 19, 2014 at 1:31pm*

**math**

Use Pythagorean theorem to find other leg. h^2 + b^2 = Hypotenuse^2 h^2 + (5√3)^2 = 100 Solve for h. Area = 1/2 hb Insert values and solve for area.
*Saturday, April 19, 2014 at 1:30pm*

**math**

why use 16v^2 4v x 4v ?
*Saturday, April 19, 2014 at 1:28pm*

**math**

-4x-4y=12 Mutliply by 4. -16x - 16y = 48 Second equation: 16y=-16x-48 Transpose. 16x + 16y = -48 Multiply by -1. -16x - 16y = 48 What does that tell you?
*Saturday, April 19, 2014 at 1:25pm*

**math**

16v^2 / 5v^3 = 16 / 5v
*Saturday, April 19, 2014 at 1:19pm*

**math**

The base of triangle ABC is one half the altitude.The altitude of triangle DEF is one half its base. If both triangles are equal in area, what is the ratio of the altitude of triangle ABC to the altitude of triangle DEF ? a. 1:4 b. 1:2 c. 1:1 d. 2:1 e. 4:1 please answer and ...
*Saturday, April 19, 2014 at 1:18pm*

**math**

If the hypotenuse of a right triangle is 10 and one leg is 5 square root 3, then the area of the triangle is a. 5 b. 25 square root 3 c. 25 d. 50 square root 3 e. 12.5 square root 3 please answer and explain
*Saturday, April 19, 2014 at 1:14pm*

**math**

The length of a rectangle is represented by the numerical value of 5V^3. If the recrtangle is equal in area to a square with a side represented by 4V, what is the width of the rectangle in terms of V?
*Saturday, April 19, 2014 at 1:11pm*

**math**

The length of a rectangle is represented by the numerical value of 5V^3. If the recrtangle is equal in area to a squae with a side represented by 4V, what is the width of the rectangle in terms of V? a. 1/80V^5 b. 4/5V c. 16/5V d. 16/5V^2 e. 5V/16 please answer and explain
*Saturday, April 19, 2014 at 1:09pm*

**math**

-4x-4y=12 16y=-16x-48 identify the solution of the system or equatuions
*Saturday, April 19, 2014 at 1:03pm*

**Math**

We do not do your homework for you. Although it might take more effort to do the work on your own, you will profit more from your effort. We will be happy to evaluate your work though.
*Saturday, April 19, 2014 at 12:55pm*

**math - oops**

27 total - 3 absent = 24 present so, 3/24
*Saturday, April 19, 2014 at 12:02pm*

**math**

27 total students 3 absent, so 3/27
*Saturday, April 19, 2014 at 12:01pm*

**math**

there are 13 boys and 14 girls in mrs greens class if 3 of the students are absent today what is the ratio of students absent to students present?
*Saturday, April 19, 2014 at 11:23am*

**math**

6770 *60/6.4 = 63,470 feet/minute By the way those of us who work at sea figure about 5 seconds per nautical mile. Some lighthouses flash at the same time as they sound a horn. If you hear the horn five seconds after you see the flash, you are a mile away from the lighthouse.
*Saturday, April 19, 2014 at 11:14am*

**Math**

Part A: How many oxygen atoms are there in 50 atoms? ======================= Huh ? perhaps you mean in 50 molecules? I will assume that 1/4 * 24 = 6 Oxygen atoms / molecule 6*50 = 300 in 50 of them If there are 6 in one then there are 300 in 50
*Saturday, April 19, 2014 at 11:09am*

**Math**

Glucose is a common type of sugar. One glucose molecule is made up of 24 atoms. 1/4 of the atoms are carbon, 1/2 are hydrogen atoms, and 1/4 are oxygen atoms. Part A: How many oxygen atoms are there in 50 atoms? Part B:Explain how you found your answer for Part A
*Saturday, April 19, 2014 at 10:50am*

**math**

if sound travels 6770 feet in 6.4 seconds. how far will it travel in one minute
*Saturday, April 19, 2014 at 10:32am*

**Math**

Indigo Industrial, Inc. is trying to determine which, if any, of five different projects it should undertake. Indigo Industrial has a 8.25% required rate of return on projects that it undertakes. The projected cash flows for each of the projects are given in the table below: ...
*Saturday, April 19, 2014 at 10:28am*

**Math**

The Oscar Drapery Company makes three types of draperies at two different locations. At location 1, it can make 10 pairs of deluxe draperies, 20 pairs of better draperies, and 13 pairs of standard drapes per day. At location 2, it can make 20 pairs of deluxe drapes, 50 pairs ...
*Saturday, April 19, 2014 at 10:17am*

**Math**

A random variable Y has the following CDF ; Fy(y)= 0 x<-1 0.25 -1≤x<2 0.5 2≤x<3 1 x≥3 a)Find P[y\B] (Y) FOR B= y<3 b) Find E [y\B] c)Find Var [y\B]
*Saturday, April 19, 2014 at 10:13am*

**Math probability**

You roll two fair 6-sided dice. Let X be the sum of the two independent rolls. (a) Give the PMF of X in table form. (b) Give a mathematical expression for the PMF of X .
*Saturday, April 19, 2014 at 10:03am*

**Math probability**

You roll two fair 6-sided dice. Let be the sum of the two independent rolls. (a) Give the PMF of in table form. (b) Give a mathematical expression for the PMF of .
*Saturday, April 19, 2014 at 10:02am*

**Math**

Steve gave a good example to Taylor here for the same question: http://www.jiskha.com/display.cgi?id=1360645422
*Saturday, April 19, 2014 at 9:31am*

**Math**

How do you write a system of linear equations in two variables? Explain this in words and by using mathematical notation in an equation.
*Saturday, April 19, 2014 at 9:29am*

**math**

Your mean is correct to get a mean of 72, let the extra score be x and he now has 10 scores to average (633 + x)/10 = 72 633 + x = 720 x = 720-633 = 87 he needs an 87 or, think of it this way. to have an average of 72 on 10 tests, he needs a total score of 720 so far he has ...
*Saturday, April 19, 2014 at 9:28am*

**math**

Anxious Billy Bob pulled out his math recording sheet and saw the following scores 54,62,65,68,70,70,78,82,84 A. He want to calculate his average.Which measure of center is the average?compute it ? I have this :The measure of center is the average, mean 633/9=70.33=about 70% B...
*Saturday, April 19, 2014 at 9:15am*

**math**

I assume you mean to accommodate one car. So, (230*150)/69 ft^2/car
*Saturday, April 19, 2014 at 5:05am*

**math**

195mi / 3.25hr = 60 mi/hr
*Saturday, April 19, 2014 at 5:04am*

**Math**

well, what's 1.6 + 0.11 ?
*Saturday, April 19, 2014 at 5:03am*

**math**

The garage you work for as an auto mechanic measures 230 ft. by 150 ft and handles 69 cars. Using the existing garage as a model, how much space would you plan to have in your garage?
*Saturday, April 19, 2014 at 1:50am*

**math**

a car travelved a distance of 195 miles in 3 hours 15 minutes what is the unit rate
*Saturday, April 19, 2014 at 12:31am*

**math (please check answer)**

What type of graph does not show the number of times a response was given? box-and-whisker plot****** line plot stem-and-leaf plot bar graph
*Saturday, April 19, 2014 at 12:24am*

**Math**

A flower was 1.6 meters high one week ago. In 7 days it grew 11 centimeters. Find the current height of the flower. (1 point) 12.3 m 1.71 m 125 cm or 11.2 cm
*Saturday, April 19, 2014 at 12:01am*

**math 117**

upward? f(x)=x^2+5+6
*Friday, April 18, 2014 at 11:07pm*

**math 117**

determine equation for g(x) that results from translating the function f(x)=x^2 +5 upward 6 units
*Friday, April 18, 2014 at 10:15pm*

**MATH I NEED HELP PLEASE**

find the function h(x)=1/98 x^2
*Friday, April 18, 2014 at 10:10pm*

**MATH I NEED HELP PLEASE**

find the function h(x)=1/98 x^2
*Friday, April 18, 2014 at 10:03pm*

**Math**

since the new radius is 3/4 the old one, the new volume is (3/4)^3 the old volume (3/4)^3 * 1920 = 27/64 * 1920 = 810
*Friday, April 18, 2014 at 6:59pm*

**Math**

Okay.
*Friday, April 18, 2014 at 6:53pm*

**Math**

Please post your other question as a New Question. I'll help you if I can.
*Friday, April 18, 2014 at 6:47pm*

**Math**

Okay thank you. I have another question, can you help? Im not very good at this math.
*Friday, April 18, 2014 at 6:43pm*

**Math**

V = pi * r^2 * h/3 The height of the first cone is 3.1847
*Friday, April 18, 2014 at 6:29pm*

**math 8th**

What is the diameter of this circle?
*Friday, April 18, 2014 at 6:26pm*

**math 8th**

Find the circumference of the given circle. Round to the nearest tenth. circle (1 point) 22.0 cm 38.5 cm 11.0 cm 42.8 cm
*Friday, April 18, 2014 at 6:24pm*

**Math**

Hello I was wondering if you can help me with a question, I cant seem to figure it out. Q: A cone has a radius of 24 cm and a volume of 1,920 cm. What is the volume of a similar cone with a radius of 18 cm? A: 480 cm B: 810 cm C: 1,080 cm D: 1,440 cm Thanks!
*Friday, April 18, 2014 at 6:06pm*

**Math**

multiply each term by z z^2 + 1 = 2z z^2 - 2z + 1 = 0 (z-1)^2 = 0 z-1 = 0 z = 1 you had that, good job
*Friday, April 18, 2014 at 5:27pm*

**Math**

z+1/z=2; z=? (1/z is a fraction) Please show work. I got C.1 as my answer. A.Square root of 3 B.1/2 C.1 D.1 1/2 E.2
*Friday, April 18, 2014 at 5:22pm*

**physics**

Using the Bessel equation estimate theta= 1.22 wavlength/diameter but for small angles, theta=separation/distance so distance=separation*diameter/ 1.22*wavelength which is about= 4.4E11*1.03/1.22*550E-9 =about 4E18/6= .7E18m check my math, you do it more accurately.
*Friday, April 18, 2014 at 4:45pm*

**math (cant figure it out)**

thank you! I get it now
*Friday, April 18, 2014 at 4:37pm*

**math**

think of the hexagon as six equilateral triangles. I assume that you can find the area of such a triangle of side 2 (1/6 the perimeter of the hexagon). Now multiply that area by 6, for the six triangles.
*Friday, April 18, 2014 at 4:17pm*

**math**

the cow grazes grass in a sector of a circle. The area of a sector of radius r and angle θ is a = 1/2 r^2 θ where θ is in radians, not degrees. So, here we have a = 1/2 (15^2) (24/180 * pi) = 15 pi
*Friday, April 18, 2014 at 4:15pm*

**math**

what is 8% more than c? That should equal 162.
*Friday, April 18, 2014 at 4:13pm*

**math**

how many tiles satisfy each category? pick the one with the highest number of matching tiles (should be more than half the tiles, to make it "likely")
*Friday, April 18, 2014 at 4:12pm*

**math (cant figure it out)**

TV+HW = 8% + 13% = 21% 21% of 24 hours is .21 * 24 = 5.04 hours
*Friday, April 18, 2014 at 4:10pm*

**math**

ABCDEF is a regular hexagon. If the perimeter = 12 find the area of ABCDEF.
*Friday, April 18, 2014 at 4:08pm*

**math**

A cow is attached to a rope in a pasture bordered by two fences ( each 60 feet long) which meet at an angle of 24 degree. If the rope attached to the cow is 15 feet long, over how many square feet can the cow graze? a. 2 pi b. 15 pi c. 30 pi d. 45 pi e. 240 pi please answer ...
*Friday, April 18, 2014 at 4:02pm*

**math**

Katrina's ski boots cost 8% more than her skis.Her ski boots cost $162. Whick equation can be used to find the cost, c, of Katrina's skis? a. c + 0.08c =162 b. c + 0.8c = 162 c. c - 0.08c = 162 d. c - 0.8c = 162 please answer and explain
*Friday, April 18, 2014 at 3:54pm*

**math (cant figure it out)**

Grade 7 students were surveyed to determine how many hours per day they spent on various activities. Eating is 8%, homework is 8%, sleeping is 33%, TV is 13%, socializing 13%, and school is 25%. About how many hours per day altogether were spent on watching TV and homework?
*Friday, April 18, 2014 at 3:52pm*

**math**

Regis has a bag with 8 tiles numbered 1 through 8. He randomly draws one tile from the bag without looking.Which of the following decribes a likely outcome? a. He selects a tile with the number 0. b. He selects a tile with the number 4. c. He selects a tile with a number ...
*Friday, April 18, 2014 at 3:50pm*

**MATH**

for a better graph, substitute (24-2x)
*Friday, April 18, 2014 at 3:43pm*

**Math**

I have no idea. It depends on the pressure in the ball and the temperature. P V = n R T so n = moles of He = P V/ (RT) = P (4/3)r^3 /(RT) a mol of He has mass of 4 grams
*Friday, April 18, 2014 at 3:43pm*

**Math**

no maximum amount. That depends on the pressure. Helium may be added to the ball until its skin ruptures. However, the volume of the ball is 4/3 pi * 12^3 in^3
*Friday, April 18, 2014 at 3:42pm*

**MATH FACTOR POLYNOMIALS**

I was looking for what with 3 would make 2 and it is one.
*Friday, April 18, 2014 at 3:39pm*

**Math**

A ball is filled with helium. If the ball has a diameter of 24 inches, what is the maximum amount of helium that the ball may hold?
*Friday, April 18, 2014 at 3:15pm*

**Math**

tan^-1 (.25) = 14 deg
*Friday, April 18, 2014 at 3:10pm*

**MATH FACTOR POLYNOMIALS**

thanks so much - but I have no idea what you did. why is it +3-1=2. How did you get to this? Is there a rule?
*Friday, April 18, 2014 at 3:08pm*

**Math**

A ramp has a height of 3 feet and a base of 12 feet. Which of the following best represents the angle of elevation? A. 14 degrees B. 16 Degrees C. 18 Degrees D. 20 Degrees
*Friday, April 18, 2014 at 3:08pm*

**math**

Go ahead, try to make a tile floor out of regular pentagon tiles
*Friday, April 18, 2014 at 3:06pm*

**Math**

You can not copy and paste so I do not see your choices but tan E = 20/d d = 20/tan E
*Friday, April 18, 2014 at 3:02pm*

**MATH FACTOR POLYNOMIALS**

+3-1 = +2 so (x+3)(x-1)
*Friday, April 18, 2014 at 3:01pm*

**Math**

A man looks up at the top of a tree. The angle of elevation is 42 degrees. If the tree is 20 feet tall, which of the following best represents the distance from the base of the tree where the man is standing?
*Friday, April 18, 2014 at 3:00pm*

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