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April 23, 2014

Homework Help: Math

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Recent Math Questions

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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&b​iw=1517&bih=714&tbm=isch&imgil=ER57nZqRD​Lf9pM%253A%253Bhttps%253A%252F%252Fencry​pted-tbn3.gstatic.com%252Fimages%253Fq%2​53Dtbn%...
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=136​0645422
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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