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April 16, 2014

Homework Help: Math

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Recent Math Questions

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math
Suppose that people's heights (in centimeters) are normally distributed, with a mean of 170 and a standard deviation of 5. We find the heights of 80 people. (You may need to use the standard normal distribution table. Round your answers to the nearest whole number.) (a) ...
Monday, March 17, 2014 at 8:00am

Math
Not quite, Fiona. When you finally got an answer, you ought to have done just a sanity check. The average speed was somewhere near 200 mph, and the flew for 7 hours, a distance of 57 mile is ludicrous. since time = distance/speed, and the total time was 7 hours, then we want ...
Monday, March 17, 2014 at 5:46am

Math
Seattle to wilderness=180mph wilderness to Seattle=225mph 225+180=405miles in 7 hrs 405/7=57.8571 mph 57.8571 miles
Monday, March 17, 2014 at 1:01am

Math
A private plane traveled from Seattle to a rugged wilderness at an average speed of 180 mph. The return trip speed s 225 mph. If the total travelling time was 7 hours, how far is Seattle from the wilderness
Monday, March 17, 2014 at 12:18am

Math 117
if y = f(x), the new shifted function will be y-10 = f(x) now just solve for the new y
Sunday, March 16, 2014 at 11:34pm

Math 117
Determine the equation of g(x) that results from translating the function f(x) = x2 + 9 upward 10 units. Thank you so much!
Sunday, March 16, 2014 at 11:30pm

Math 134
It is much easier for you but, I had a stroke and am trying to understand everything and its hard. Thanks anyway for your help sorry to be a bother.
Sunday, March 16, 2014 at 11:30pm

Math 134
Thanks I did
Sunday, March 16, 2014 at 11:27pm

Math 134
Don't try to "create" fractions in this format, the spacing comes out all wrong. did you mean: 2x/(x+3) + 9/(x-3) - 36/(x^2 - 9) ?? if so, notice that x^2-9 = (x+3)(x-3) , so your LCD is (x+3)(x-3) give it a try
Sunday, March 16, 2014 at 11:24pm

Math
C = pi*d = pi*20
Sunday, March 16, 2014 at 11:24pm

Math college level
well, since your tax bracket has not changed, you will still pay the same percentage. 5220/29000 = 18% So, what is 18% of the new, greater income?
Sunday, March 16, 2014 at 11:23pm

Math
pi*(15/2)^2
Sunday, March 16, 2014 at 11:22pm

Math 134
my goodness! I answered this same question for you earlier. All you have to do here is change the numbers. http://www.jiskha.com/display.cgi?id=139​5018684
Sunday, March 16, 2014 at 11:22pm

math
well, since the equation will be x^2+y^2 = r^2 just plug in your values for x and y, and that will give you the necessary r.
Sunday, March 16, 2014 at 11:20pm

Math
Becca wants to make a giant cherry pie to try to break the world record. If she succeeds in making a pie with a 20 foot diameter, what will be the total distance around the pie?
Sunday, March 16, 2014 at 11:20pm

Math college level
Sorry to bother those who are helping me but I simply just do not understand and really need help. A single person could expect to pay $5220 in income taxes with an adjusted income gross of $29,000. If my adjusted gross increases to $2,000 but does not place me in a higher tax...
Sunday, March 16, 2014 at 11:20pm

Math 134
Sorry to bother those who are helping me but I simply just do not understand and really need help. A single person could expect to pay $5220 in income taxes with an adjusted income gross of $29,000. If my adjusted gross increases to $2,000 but does not place me in a higher tax...
Sunday, March 16, 2014 at 11:19pm

math
determine the equation of a circle that has its center a (0,0) and passes through each point. a)(6,-3)
Sunday, March 16, 2014 at 11:19pm

Math
How many square inches of crust would it take to cover the bottom of a pie dish with a 15 diameter?
Sunday, March 16, 2014 at 11:18pm

math
ummh, that would be (0,0) You should know the properties of this , the simplest form of the equation of a circle.
Sunday, March 16, 2014 at 11:16pm

math help--Please help!

Sunday, March 16, 2014 at 11:16pm

Math 117
Thank you so much, greatly appreciated!
Sunday, March 16, 2014 at 11:16pm

Math 117
done, check back on your previous post of this
Sunday, March 16, 2014 at 11:15pm

Math 117
Awesome. Thank you so much!
Sunday, March 16, 2014 at 11:14pm

Math 117
I interpret (fg)(x) as (-6x-1)(4x^2) = -24x^3 - 4x^2
Sunday, March 16, 2014 at 11:14pm

Math
C = pi * d C = 3.14 * 13 C = 40.82 inches
Sunday, March 16, 2014 at 11:14pm

Math 117
I bet you mean: f(x) = (x+10)^2 new equation: g(x) = (x+10 - 12)^2 = (x-2)^2
Sunday, March 16, 2014 at 11:12pm

math
radius of each bubble = .005 m or (1/2) cm volume of each bubble = (4/3)π(1/2)^3 cm^3 so 1 million of them = 1000000(4/3)π(1/2)^3 = appr 523598.78 cm^3 = appr .5236 m^3 a bit over 1/2 cubic metre
Sunday, March 16, 2014 at 11:11pm

Math 134
Add or subtract and simplify if possible: 2x + 9 -36 ---- --- --------- x+3 x-3 x^2-9
Sunday, March 16, 2014 at 11:08pm

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 little more festive. How long does the ribbon need to be in order to fit around the dish?
Sunday, March 16, 2014 at 11:08pm

Math 134
Sorry to bother those who are helping me but I simply just do not understand and really need help. A single person could expect to pay $5220 in income taxes with an adjusted income gross of $29,000. If my adjusted gross increases to $2,000 but does not place me in a higher tax...
Sunday, March 16, 2014 at 11:05pm

math
state the corrdinates of the centre of the circle described by the equation. x^2+y^2=R^2 please help!
Sunday, March 16, 2014 at 10:49pm

math
x^2 + 5x - 2 < 0 Solve and graph: x^2 + 5x - 2 = 0 Use Quadratic Formula an get: X = -5.37, and 0.372 Solution to inequality:-5.37 < X < 0.372
Sunday, March 16, 2014 at 10:39pm

Math 117
If you can please help, I would greatly appreciate it! Determine the equation of g(x) that results from translating the function f(x) = (x + 10)^2 to the right 12 units. Thank you!
Sunday, March 16, 2014 at 10:38pm

Math 117
Consider the equations: f(x) =-6x-1 and g(x)=4x^2 Select the solution for (fg)(x)
Sunday, March 16, 2014 at 10:29pm

Math
hi
Sunday, March 16, 2014 at 10:26pm

Math 117
If you can please help, I would greatly appreciate it! Determine the equation of g(x) that results from translating the function f(x) = (x + 10)2 to the right 12 units. Thank you!
Sunday, March 16, 2014 at 10:26pm

Math
Just realized that I answered this same question back in 2011 http://www.jiskha.com/display.cgi?id=130​6326095
Sunday, March 16, 2014 at 10:18pm

Math
Did you make a diagram? Did you not realize that the direction of the plane and the wind form a right angle ? How did you get 266.4 for the groundspeed ? (I got 241.86)
Sunday, March 16, 2014 at 10:16pm

math
Bubble wrap sells in sheets, and each sheet has 1 million individual spherical bubbles, each with a diameter of 0.01 m. What is the total volume of air contained in the bubbles of two sheets of bubble wrap? Round to the nearest tenth.
Sunday, March 16, 2014 at 10:11pm

Math 134
Thank you so much I appreciate your help.
Sunday, March 16, 2014 at 10:08pm

Math
Make the rectangle sit on the diameter. Let its base be 2x and its height be y then x^2 + y^2 = 27^2 y = √(729 - x^2) area = 2xy area^2 = 4x^2y^2 = 4x^2(729-x^2) = 2916x^2 - 4x^4 d(area^2)/dx = 5832x - 16x^3 = 0 for a max of area (if area is the largest of all areas, ...
Sunday, March 16, 2014 at 10:06pm

Math
Yes. An obtuse angle has more than 90 degrees but less than 180 degrees.
Sunday, March 16, 2014 at 10:03pm

Math 134
rate = 4760/34000 = .14 so .14(36000) = $ 5040
Sunday, March 16, 2014 at 9:56pm

Math
George says that if you subtract 185 degrees from an angle that measures 360 degrees, the new angle is an obtuse angle. Is this true
Sunday, March 16, 2014 at 9:55pm

Math 134
A single person could expect to pay $4,760 in income taxes on an adjusted gross income of $34,000 how much more tax should the person expect to pay if her adjusted gross income increased by $2,000, knowing that this owuld not move her into the higher tax bracket
Sunday, March 16, 2014 at 9:11pm

math
You're welcome, Melissa.
Sunday, March 16, 2014 at 9:06pm

math
thanks Ms.Sue
Sunday, March 16, 2014 at 9:05pm

math
6*9 = 54
Sunday, March 16, 2014 at 9:03pm

Math
Find the dimensions of a rectangle of maximum size that will fit into a half circle of radius 27
Sunday, March 16, 2014 at 8:57pm

math
please somebody explain the product of 6, and the sum of 4 and 5?I have to show if 6x4+5 is the right answer.
Sunday, March 16, 2014 at 8:51pm

math
Volume cone = 1/3π(r^2)h Surface area Square pyramid = 2bs+b^2 Volume Rectangular prism = L*b*m
Sunday, March 16, 2014 at 8:46pm

Math
Can someone show me how to solve these questions. A plane is is flying 240 mph heading N60°E. The wind is blowing S30°E at 30 mph.   6. What is ground speed of the plane?    The ground speed of the plane is 266.40. 7. What is the smallest angle in the ...
Sunday, March 16, 2014 at 8:35pm

Math (Partial)
First two questions and last. Z = (score-mean)/SD SD^2 = variance Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability of the Z score.
Sunday, March 16, 2014 at 8:27pm

math
It's not right. To find the volume, multiply the length times the width times the height.
Sunday, March 16, 2014 at 8:19pm

math
An architect was designing a rectangular room with a lenghth of 16ft,a width of 14ft,and a height of 10ft.what is the volume of the room?I added and got 40 cubic feet but not for sure if its right
Sunday, March 16, 2014 at 8:13pm

math
(100/5^2)(4^3) 4 * 64 = ?
Sunday, March 16, 2014 at 8:06pm

math
please solve 100 divided by 5 to the 2nd power times 4 to the 3rd power.
Sunday, March 16, 2014 at 7:59pm

math
Ms.whittier wrote the following on the board:the product of 6 and the sum of 4 and 5.sherry wrote the following expression,6x4+5.did she write the correct expression?why or why not.
Sunday, March 16, 2014 at 7:43pm

Math 2 questions
volume of 2 similar solids is proportional to the cube of their corresponding sides, so x/240 = 23^3/92^3 = (23/92)^3 = (1/4)^3 = 1/64 64x = 240 x = 3.75 the new volume is 3.75 ft^3 If I told you that the surface area of 2 similar solids is proportional to the square of their ...
Sunday, March 16, 2014 at 7:19pm

Math
27
Sunday, March 16, 2014 at 6:41pm

Math 2 questions
A rectangular prism has a width of 92 ft and a volume of 240 ft3. Find the volume of a similar prism with a width of 23 ft. Round to the nearest tenth, if necessary. 3.8 ft3 60 ft3 15 ft3 10.4 ft3 A pyramid has a height of 5 in. and a surface area of 90 in2. Find the surface ...
Sunday, March 16, 2014 at 6:20pm

Math plz help me!!! URGENT!!
You are welcome.
Sunday, March 16, 2014 at 6:05pm

Math plz help me!!! URGENT!!
Thank u soooo much,Damon! :D
Sunday, March 16, 2014 at 6:04pm

Math plz help me!!! URGENT!!
(1/3) pi r^2 h = (1/3)(3.14) (100)(6) =628 mm^3 pi r L = 3.14 * 7 * 13 = 286
Sunday, March 16, 2014 at 6:02pm

Math plz help me!!! URGENT!!
Find the volume of a cone with a radius of 10 mm and a height of 6 mm. 628 mm3 600 mm3 1,884 mm3 1,254 mm3*** Find the lateral area of a cone with a radius of 7 ft. and a slant height of 13 ft. Use 3.14 for π and round to the nearest whole number. 439 ft2 324 ft2 572 ft2 ...
Sunday, March 16, 2014 at 5:48pm

math
Solve without newton-raphson method
Sunday, March 16, 2014 at 5:03pm

basic college math
in questions like these it is usually to find where the two deals are equal in cost. Or, equivalently, for how many miles is deal A cheaper than deal B. The cost the same when 25 +.4m = 30 + .25m Now just solve for m
Sunday, March 16, 2014 at 4:54pm

math
No genius required. Just use your favorite numerical method to find the root: x^.223 - x^.123 - 1 = 0 x = 92.6740 Newton-Raphson is a likely one for this, since the curve is nice and smooth
Sunday, March 16, 2014 at 4:48pm

Chemistry
I think it's your math. I obtained the same equation as you and it looks ok to me. I went through the math and obtained two values for x of 0.0631 (which can't be right since 0.110-2x gives a negative number) and 0.0471. That value plugged back into Kp expression gives...
Sunday, March 16, 2014 at 4:15pm

math
Finney & Company purchased $1,800 of merchandise on 5/6. The terms were 2/15 EOM. The sneakers were received on 5/20, sent FOB Shipping Point. Freight charges amounted to $45. What payment must be made by that date to take advantage of the discount?
Sunday, March 16, 2014 at 4:11pm

math
City Cellular purchased $28,900 in cell phones on April 25. The terms of sale were 4/20, 3/30, n/60. Freight terms were F.O.B. destination. Returned goods amounted to $650. . If the manufacturer charges a 4 1/2 % late fee, how much would City Cellular owe if it did not pay ...
Sunday, March 16, 2014 at 3:59pm

math
0.002N = 76 N = 38,000
Sunday, March 16, 2014 at 3:52pm

math
GP = 22/day*6days + 0.18*2766.50 =
Sunday, March 16, 2014 at 3:47pm

Chemistry
This is a problem I got on my Mastering Chemistry homework: Consider the following reaction: H2(g)+I2(g)⇌2HI(g) A reaction mixture at equilibrium at 175 K contains PH2=0.958atm, PI2=0.877atm, and PHI=0.020atm. A second reaction mixture, also at 175 K, contains PH2=PI2= 0...
Sunday, March 16, 2014 at 3:42pm

math
If P^0.223 =1 + P^0.123. Solve for P. Note:only a genius can solve this. Best of luck
Sunday, March 16, 2014 at 3:36pm

math
sqrt ( 3 x * y ^ 3 )* sqrt ( 2 x ^ 2 * y ) / sqrt ( 6 x ^ 3 * y ^ 4 ) = sqrt ( 3 x * y ^ 3 * 2 x ^ 2 * y ) / sqrt ( 6 x ^ 3 * y ^ 4 ) = sqrt ( 6 x ^ 3 y ^ 4 ) / sqrt ( 6 x ^ 3 y ^ 4 ) = 1
Sunday, March 16, 2014 at 1:52pm

math
can vol = pi r^2 (10) = (22/7)(3.5)^2(10) = 385 cm^3 pan vol = 20*9*14 = 2520 cm^3 2520/385 = six and a half
Sunday, March 16, 2014 at 1:39pm

math
You are pouring water from a cylindrical can is 7 cm in diameter and 10 cm high into a rectangular pan that is 20 cm in width, 9 cm in length and 14 cm deep. How many cans, can you pour into the pan? Use 22/7 for pi.
Sunday, March 16, 2014 at 1:32pm

Math
Yes. A
Sunday, March 16, 2014 at 1:22pm

Math
It was A.
Sunday, March 16, 2014 at 1:16pm

Math
What is a trend line on a scatter plot? A. a visual representation of the relationship between two variables. B. a line connecting only the highest and lowest values on a graph. C. A line connecting all the data points on a scatter plot* D. Any line of data on a graph
Sunday, March 16, 2014 at 1:10pm

math
Simplify,root 3xy^3 root 2x^2y divided by root 6x^3y^4 x>0,y>0
Sunday, March 16, 2014 at 1:04pm

basic college math
What is your question?
Sunday, March 16, 2014 at 12:53pm

basic college math
need the answer to track A offers a flat fee of $25 and $.40 per mile. truck b offers a flat fee of $30 and $.25 per mile
Sunday, March 16, 2014 at 12:51pm

Math
Towns A to F are to be connected by cable along existing roads. Need to figure the minimum length of cable required. Eash town must be connected to at least one other town. Distances are in miles. A-B 20, A-E 71, A-F 38, B-A 20, B-C 58, B-E 62,C-B 58, C-D 17, C-E 42, D-C 17, D...
Sunday, March 16, 2014 at 12:31pm

Math
number of chairs --- x number of tables --- 14-x 30x + 70(14-x) = 660 solve for x, pretty straightforward.
Sunday, March 16, 2014 at 12:02pm

math
x^2 y = 2009 I fooled around factoring 2009 and the only square I found that was a factor was 49 49 * 41 = 2009 so 7 * 7 * 41 = 2009 so I have 2 faces that are 7*7 or 49+49 = 98 stickers then I have fours faces that are 7*41 so 4*7*41 = 1148 1148 + 98 = 1246 stickers used 2009...
Sunday, March 16, 2014 at 10:51am

math
Jack has 2009 unit cubes glued together to form a cuboid. He opens a packet containing 2009 stickers. He has enough stickers to stick one on each cube. How many stickers does he have left?
Sunday, March 16, 2014 at 10:22am

Math
Let X and Y be normal random variables with means 0 and 2, respectively, and variances 1 and 9, respectively. Find the following, using the standard normal table. Express your answers to an accuracy of 4 decimal places. P(X>0.75)= P(X≤−1.25)= Let Z=(Y−3)/4...
Sunday, March 16, 2014 at 8:27am

Math
you have a job assembling tables and chairs. you are paid $30 for each chair and $70 for each table. last week you assembled a total of 14 items and make $660. how many did you make of each?
Sunday, March 16, 2014 at 8:27am

math
max at x = -13/(2* -.5) = 13 Now just evaluate N(13)
Sunday, March 16, 2014 at 6:26am

MATH 104
how about 24/244 ?
Sunday, March 16, 2014 at 6:25am

math
time to review the quadratic formula, or follow Damian's excellent advice about online solvers.
Sunday, March 16, 2014 at 6:23am

Math
5-24,3-40,8-15, 12-...? What is the missing number?
Sunday, March 16, 2014 at 6:13am

MATH
In google type : quadratic equation online When you see list of results click on : Free Online Quadratic Equation Solver: Solve by Quadratic When page be open in rectangle type : 3x^2+9x+3=0 and click option : solve it You will see solution step by step
Sunday, March 16, 2014 at 2:32am

math
Help please select the approcimate values of x that are solutions to f(x)=0 where f(x)=-5x^2+8x+5 I so am lost please show me step by step
Sunday, March 16, 2014 at 12:28am

MATH
SELECT THE APPROXIMATE VALUES OF X THAT ARE SOLUTIONS TO F(X)=0 Where f(x)=-3x^2+9x+3 not sure which answerer is correct (2.08,-0.48) or (-5,8)
Sunday, March 16, 2014 at 12:26am

Algebra
1) There are two pet stores in zacharys town. There are dogs, cats, and hamsters at the first pet store. The second store has dogs, rabbits, and fish. Write a set that represents all of the different pets stores in the town. 2) of the 125 students in an elementary school, 89 ...
Saturday, March 15, 2014 at 11:27pm

Algebra
1) If N is the set of natural numbers that are factors of 18, represent this set in roster form. 2) Suppose U={1,2,3,4,5,6,7,8,9,10} is the universal set and A={1,4,5,9,10} What is A? 3) The wrestling team is holding a car wash. The teams goal is to raise at lease 252 and each...
Saturday, March 15, 2014 at 11:27pm

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