Friday

November 28, 2014

November 28, 2014

**Branches of Math**

**Recent Math Questions**

Post a New Question | Current Questions

**Math (please check)**

Compute the indicated derivative. d/dt [ ( t^2 + t^0.5 ) ( t^0.5 - t^-0.5 ) ] |t=1 I took the f and g prime then I used the quotient rule my final answer came out to 3t^1.5 - 1.5t^0.5 + t + 0.5t^-1 then I plugged 1 in for t and got 5.196 Please let me know if this is right, if...
*Thursday, October 9, 2014 at 5:27pm*

**Math! Please check!**

When constructing the circumcenter and circumscribed circle of a triangle, you need to find the intersection of all three of which type of line? A- medians B- perpendicular bisectors C- altitudes D- angle bisectors My choice is B.
*Thursday, October 9, 2014 at 5:19pm*

**Math! Please check!**

Given that lines AC and GE are both perpendicular to line BF, and AG and CE are both perpendicular to GE, you can conclude that? A- AG = CE B- BC = CD C- lines AC and GE are perpendicular to each other D- lines AE and CG are perpendicular to each other My choice is A.
*Thursday, October 9, 2014 at 5:16pm*

**Math**

How do rate tables help me find equivalent ratios
*Thursday, October 9, 2014 at 4:35pm*

**Math**

On an airplane,there are two seats on the left side in each row and three seats on the right side. There are 90 seats on the right side of the plane. a. How many seats are on the left side of the plane? b. How many seats are there altogether?
*Thursday, October 9, 2014 at 4:32pm*

**cca math**

help please! Lesson 11: Rational Numbers Unit TestLesson 11: Rational Numbers Unit Test
*Thursday, October 9, 2014 at 4:31pm*

**math**

if your in cca and don't mind helping me with Lesson 11: Rational Numbers Unit TestLesson 11: Rational Numbers Unit Test I would be so grateful!
*Thursday, October 9, 2014 at 4:06pm*

**Math**

Which expression has a value of 199? A- 4 x 28 + 6 x 17 - 15 B- 4 x 17 + 6 x 28 - 38 C- 4 x 38 + 6 x 15 - 28 D- 4 x 15 + 6 x 38 - 88
*Thursday, October 9, 2014 at 3:56pm*

**Math**

What is the slope of the line whose equation is –48 = 2x − 8y? This is supposed to be answered in a fraction.. I'm stuck
*Thursday, October 9, 2014 at 3:55pm*

**math**

Explain Sean biked 43 miles on Monday, 23 miles on Tuesday, and 62 miles on Wednesday. How many more miles did he bike on Wednesday than on Monday? Draw a picture and write an equation to solve. Then solve
*Thursday, October 9, 2014 at 3:49pm*

**math physics**

The handle of a vegetable wagon makes an angle of 25.0° If the peddler exerts a force of 35.0 lb along the handle, how muchwork does the peddler do in pulling the cart 1.00 mi? Is this correct? 35.0*1.00coseine25.0degrees=31.720
*Thursday, October 9, 2014 at 2:01pm*

**math!**

A rectangular box is twice as long as it is wide. The height of the box is 3 feet less than the width. If the box is x feet wide, what polynomial represents its volume in cubic feet? A. 4X-3 B. 2X(cubed)+6x(squared) C.2X(squared)-6X D. 2X(cubed)-6X(squared) any help??
*Thursday, October 9, 2014 at 1:57pm*

**math**

2/5(x+3)=6 2/5x+6/5=6 5/2(2/5x) +6/5 = 6(5/2) X+6/5=15 X-6/5=15-6/5 X=
*Thursday, October 9, 2014 at 1:33pm*

**College Math **

A block with a mass of m = 31 kg rests on a frictionless surface and is subject to two forces acting on it. The first force is directed in the negative x-direction with a magnitude of F1 = 11 N. The second has a magnitude of F2 = 22.75 N and acts on the body at an angle θ...
*Thursday, October 9, 2014 at 1:22pm*

**math-physics**

How much work is done lifting a wrecking ball 6.50 m above the ground? So the formula for this problem would be: W=fs F=200kg S=6.50m (200)(6.50)=1300
*Thursday, October 9, 2014 at 1:19pm*

**Math**

A carpenter makes a triangular frame by joining three pieces of wood that are 20 cm, 24 cm, and 30 cm long. What is the measure to the nearest degree of the smallest angle in the frame? (Enter only the number.)
*Thursday, October 9, 2014 at 1:06pm*

**Math**

If the stem-and-leaf plot shows kilometers walked by participants in a charity benefit walk. How do I determine how many people participated in the walk and how many of the walkers traveled more than 14 kilometers? I don't want the answer. I just want to know how to work ...
*Thursday, October 9, 2014 at 12:21pm*

**math**

Have the following set of eight blocks: 1 2 3 4 5 7 8 9. Arrange the blocks into two groups of four such that each group has the same total?
*Thursday, October 9, 2014 at 10:36am*

**math**

whats the midpoint of 2500-6500?
*Thursday, October 9, 2014 at 9:17am*

**math**

Mr. Winsett and Ms. Phelps are having a back to school party. Mr. winsett brought 48 hot wings and mrs. phelps brought 18 cans of soda. what is the greatest amount of people that can come and share the food equally with no left overs?
*Thursday, October 9, 2014 at 9:03am*

**math**

What is the surface area of a sphere that has a radius of 5 cm? Use 3.14 for . Round to the nearest tenth.
*Thursday, October 9, 2014 at 8:20am*

**math**

On a treadmill, Andrea walks a distance of 2 km. She then doubles the speed of the treadmill and jogs for another 2 km. If the total time she spent on the treadmill is 1 hour, find the speeds at which she walks and jogs.
*Thursday, October 9, 2014 at 8:17am*

**Math: Differential Equations**

Solve the initial value problem y' = y^2, y(0) = 1 and determine the interval where the solution exists. I understand how the final solution comes to y = 1/(1-x), but do not understand how the solution is defined from (-infinity, 1) and not (1, infinity).
*Thursday, October 9, 2014 at 3:19am*

**3rd grade math**

What strategy do you use if you draw an array of 5 columns with 7 rows 4 rows are shaded. The other 3 rows are not shaded.How do you find the answer to 35 ÷ 5?
*Thursday, October 9, 2014 at 3:15am*

**math**

Find the equation of the tangent line to the graph of f(x) = (4x − 8)/(x + 1) at x = 0. (Use y for your dependent variable.)
*Thursday, October 9, 2014 at 2:54am*

**math**

determine known length for a triangle one side is 2.5cm other side 1.6cm find how solve the third side
*Thursday, October 9, 2014 at 2:16am*

**Math**

write these pairs with common denominators 5/8 and 1/2 ?
*Thursday, October 9, 2014 at 12:48am*

**math**

About 25% of those called will find an excuse to avoid jury duty. If 11 people are called for jury duty, what is the probability that all 11 will be available to serve on the jury? (Round your answer to three decimal places.)
*Thursday, October 9, 2014 at 12:29am*

**Math**

KILOWATT-HOURS OF ELECTRICITY USED MONTH KWH USED/ MONTH DWH USED JAN 2,640 JUL 960 FEB 2,190 AUG 1,380 MAR 1,500 SEP 1,110 APR 1,620 OCT 840 MAY 1,440 NOV 1,260 JUN 1,080 DEC 1,820 A. Describe how to find the range of the data set. B. Find the range.
*Thursday, October 9, 2014 at 12:14am*

**Math**

Whats the midpoint for 2500-7000? Whats the steps?
*Wednesday, October 8, 2014 at 11:57pm*

**Math! Please check!**

The complement of an angle measures 37°. What is the measure of the angle? A- 143° B- 127° C- 63° D- 53° My choice is C.
*Wednesday, October 8, 2014 at 11:41pm*

**Geometry**

Can anybody help me with this word problem? A homeowner, who loves math, decides to make a garden/patio area in the following way. She decides to make the gardening area, where she will plant roses bushes in the shape of an equilateral triangle having a side length of 10 feet...
*Wednesday, October 8, 2014 at 11:27pm*

**Math Need Help. No Idea how to solve**

A medical researcher is interested in the prenatal care received by pregnant women in inner cities. She interviews 35 randomly selected women with children on the streets of Baltimore and finds that the average number of gynecological checkups per pregnancy was 3, with a ...
*Wednesday, October 8, 2014 at 10:23pm*

**math**

What do you do to find a rate?
*Wednesday, October 8, 2014 at 10:01pm*

**Math**

Find the slope 5x+2y=20 I dont get what the formula is
*Wednesday, October 8, 2014 at 9:27pm*

**math**

The school colors are blue and white. Elizabeth has 84 blue balloons and 96 white balloons. How many balloon bouquets can she make if she wants to haVe the same number of each color in each bouquet and use all balloons?
*Wednesday, October 8, 2014 at 9:20pm*

**Math**

Find the slope of the line described by each equation 7x-6y=42
*Wednesday, October 8, 2014 at 9:06pm*

**Math**

How to tell which is the rise and which is the run on a slope
*Wednesday, October 8, 2014 at 9:05pm*

**math**

Explain why 2.15 and -2.15 are opposites.
*Wednesday, October 8, 2014 at 9:04pm*

**math**

Janet bakes a cake in the shape of a cube with side length x (in inches). She makes a vertical cut parallel to one of the sides, resulting in a slice with width y where x is 5 times as large as y. a) Define a function h that determines the volume of the cake before Janet makes...
*Wednesday, October 8, 2014 at 8:49pm*

**math**

there are a lot gof cars in the parking lot. seven are black and the rest are blue . how many cars are there?
*Wednesday, October 8, 2014 at 8:35pm*

**math**

Yolo has two pieces of string. One is 32 inches long, and the other is 48 inches long. She wants to make as many necklaces as she can, all of the same length. What is the longest a necklace can be?
*Wednesday, October 8, 2014 at 8:32pm*

**Homework (Math)**

What can you multiply this expression by to get rid of the imaginary part of the denominator? (1-2i)/2i
*Wednesday, October 8, 2014 at 8:01pm*

**Math! Please check!**

Okay, so this one is going to be a bit difficult to answer as I cannot post my number line, so you may just have to visualize it, or draw it out on paper. If HI = GM at what coordinates could point M lie? Point H is at 8 on the number line and point I is at 14 on the number ...
*Wednesday, October 8, 2014 at 7:59pm*

**Math**

Which ordered pairs in the form (x, y) are solutions to the equation 7x – 5y = 28? *Choose all that apply* (−6, −14)** (−1, −7) (4, 10) (7, 9)
*Wednesday, October 8, 2014 at 7:44pm*

**Math Stats**

Help me solve this please. One of the few on my hw list that I had no idea how to solve A medical researcher is interested in the prenatal care received by pregnant women in inner cities. She interviews 35 randomly selected women with children on the streets of Baltimore and ...
*Wednesday, October 8, 2014 at 7:40pm*

**Math: ALGEBRA**

How to solve this??? Solve for x. a+b= a+xy Solve for w. 2w+2h+L=p Solve for r. r(s+t)=u
*Wednesday, October 8, 2014 at 7:36pm*

**Math**

5/8 of the 64 musicians in a music contest are guitarists. Some of the guitarists play jazz solos, and the rest play classical solos. The ratio of the number of guitarists playing jazz solos to the total number of guitarists in the contest is 1:4. How many guitarists play ...
*Wednesday, October 8, 2014 at 7:34pm*

**Math: Finance**

Need help solving these finance questions? PV = C/r PV= C/r-g P= D/r-g 1st: Tom is 30 years old today. His salary next year will be $20,000. He forecasts salary growth of 5%/year and plans to retire at 60. 1) If the discount rate is 8%, what is the PV of his future salary ...
*Wednesday, October 8, 2014 at 7:29pm*

**math **

use the digits 3,5,9,4 only once to make 2addends whose sum is between 100 and 110
*Wednesday, October 8, 2014 at 7:28pm*

**math/physics**

A 75.0-kg paint cart with rubber bumpers is rolling 0.965 m/s to the right and strikes a second cart of mass 85.0 kg moving 1.30 m/s to the left. After the collision, the heavier cart is traveling 0.823 m/s to the right. What is the velocity of the lighter cart after the ...
*Wednesday, October 8, 2014 at 7:11pm*

**MATH (STATS)**

To determine the views of a students on a particular campus about fraternities, an 11-point attitude scale was administered to a random sample of 40 students. This survey yielded a sample mean of 6 (the higher the score, the more favorable the view of the fraternities) and a ...
*Wednesday, October 8, 2014 at 7:10pm*

**Math: ALGEBRA**

How to solve this??? -1-8(x+12)> -44-8x -4(-12v-9)+6(-6+5v)> -4v+12v
*Wednesday, October 8, 2014 at 7:08pm*

**math.**

A band of cumulus clouds is located at 10^4 feet. A commercial jet is traveling at 38,000 feet. What is the difference between the altitude of the clouds and the altitude of the jet?
*Wednesday, October 8, 2014 at 6:55pm*

**Math! Please check!**

If the coordinates of points A and L are –4 and 8, respectively, then the midpoint between them has a coordinate of..... A- 0 B- 2 C- 4 D- 6 My choice is B.
*Wednesday, October 8, 2014 at 6:55pm*

**Math**

There are 54 graders who play sports. Twenty-seven play baseball. The rest play soccer. Second grade has 37 soccer players. How many students play soccer?
*Wednesday, October 8, 2014 at 6:46pm*

**Math**

how many pieces of wood measuring 12-inch by 13-inch can be cut from 48-inch by 72-inch piece of wood
*Wednesday, October 8, 2014 at 6:43pm*

**Math! Please check!**

Fill in the blank. A pair of intersecting planes ________ intersect in exactly one point. A- always B- sometimes C- never D- not enough information My choice is C.
*Wednesday, October 8, 2014 at 6:42pm*

**math/physics**

A 90.0-g disk traveling 3.00 m/s to the right collides with a 75.0-g disk traveling 8.00 m/s to the left. After the collision, the heavier disk is traveling 7.00 m/s to the left. What is the velocity of the lighter disk after the collision? Do I have this setup right? (90.0*3....
*Wednesday, October 8, 2014 at 6:29pm*

**math**

use counters to model problems.1.Oliver has one juice box.Lucy has one fewer juice box than Oliver.How many juice boxes does Lucy have? Write the number. answer 1/2?
*Wednesday, October 8, 2014 at 6:21pm*

**Math**

A heated piece of metal cools according to the function c(x)=(.5)^(x−9), where x is measured in hours. A device is added that aids in cooling according to the function h(x)=−x−2. What will be the temperature of the metal after five hours? -7 Degrees Celsius 6...
*Wednesday, October 8, 2014 at 6:15pm*

**Math**

If Joe wanted to create a function that modeled an exponential function with base of 8 and what exponents were needed to reach specific values, how would he set up his function? f(x) = x^8 f(x) = log8 x f(x) = logx 8 f(x) = 8^x
*Wednesday, October 8, 2014 at 6:14pm*

**Math**

What is the logarithmic function modeled by the following table? x f(x) 8 3 16 4 32 5 f(x) = logx 2 f(x) = log2 x f(x) = 2 log10 x f(x) = x log10 2
*Wednesday, October 8, 2014 at 6:10pm*

**Math! Please check!**

Name the intersection of planes ADE and BEA. A- plane BED B- plane ABC C- line BD D- line AE My choice is D. (Sorry that I could not post an image)
*Wednesday, October 8, 2014 at 6:05pm*

**math**

A stick is cut into three pieces,each having a different length.Each piece(except the shortest)is twice as long as another piece.What fraction of the whole stick is each piece?
*Wednesday, October 8, 2014 at 5:59pm*

**Math**

A heated piece of metal cools according to the function c(x)=(.5)^(x−9), where x is measured in hours. A device is added that aids in cooling according to the function h(x)=−x−2. What will be the temperature of the metal after five hours? -7 Degrees Celsius 6...
*Wednesday, October 8, 2014 at 5:52pm*

**Math**

A population of flies grows according to the function p(x)=2(4)^x, where x is measured in weeks. A local spider has set up shop and consumes flies according to the function s(x)=2x + 5. What is the population of flies after two weeks with the introduced spider? 15 flies 23 ...
*Wednesday, October 8, 2014 at 5:42pm*

**Math & Statistics**

Problem 6 [Total 5 marks] The drug Ziac is used to treat hypertension. In a large clinical trial it was found that 32% of those in the placebo group experienced dizziness. (a) [1 mark] Assuming that the same 32% proportion applies to subjects taking the drug, find the ...
*Wednesday, October 8, 2014 at 5:37pm*

**Math (Algebra 2)**

A population of flies grows according to the function p(x) = 2(4)x, where x is measured in weeks. A local spider has set up shop and consumes flies according to the function s(x) = 2x + 5. What is the population of flies after two weeks with the introduced spider? 15 flies 23 ...
*Wednesday, October 8, 2014 at 5:32pm*

**Math**

What answer represents this number in scientific notation? 0.000000916 A. 916*10^-8 B. 9.16*10^-6 C. 916*10^8 D. 9.16*10^6 A? Thanks
*Wednesday, October 8, 2014 at 5:19pm*

**math**

write a real world problem that you can solve by writing an equation.the answer to the problem must be 6.
*Wednesday, October 8, 2014 at 5:15pm*

**math**

find the value of one hundred and fifty multplied by itself
*Wednesday, October 8, 2014 at 4:49pm*

**Math (Fractions)**

What is 3 4/5 divided by 2/5?
*Wednesday, October 8, 2014 at 4:39pm*

**Math**

A school hall has 30 rows of seats. Each row has 28 seats.How many seats are there. please show work out.
*Wednesday, October 8, 2014 at 4:35pm*

**math**

f(x)=-16t^2-22t+220 Solve using quadratic formula
*Wednesday, October 8, 2014 at 4:30pm*

**math**

You have 72 books and 90 DVD's to pack. Your client insists that the books and DVD's have to have the same number of items in them. a)What are the possible numbers of items in each box? b)If you could make the most profit by packing the fewest number of boxes, how many...
*Wednesday, October 8, 2014 at 4:28pm*

**math**

at this rate, how many trucks would pass luann if 90 vehicles passed her
*Wednesday, October 8, 2014 at 4:26pm*

**Math**

A school has 30 rows of seats. Each row has 28 seats. How many seats are there?
*Wednesday, October 8, 2014 at 4:20pm*

**math plz help**

In your last 23 basketball games, you attempted 101 free throws and made 66. Find the experimental probability that you make a free throw. Write the probability as a percent, to the nearest tenth of a percent. A. 65.3% B. 69.8% C. 69.7% D. 65.7% unsure
*Wednesday, October 8, 2014 at 3:16pm*

**Math @Reiny**

Did I do #2 right? 2.) (1-2i)/2i (1-2i)/2i = (1-2)/i x i/i = (1i-2i)/i^2 = (1i+2) =2+1i
*Wednesday, October 8, 2014 at 3:05pm*

**math**

The probability that Shania is on time for school is 1/2. Find the probability that Shania arrives on time for school for the next 5 days. Express your answer as a percent, to the nearest tenth of a percent. A. 50% B. 15.6% C. 11.4% D. 3.1% I feel like its obvious but is it D???
*Wednesday, October 8, 2014 at 3:04pm*

**math help**

Simplify the expression. 12P5 (by the way numbers are smaller) A. 11,880 B. 95,040 C. 1,235,520 D. 7,920
*Wednesday, October 8, 2014 at 2:56pm*

**math**

There are 18 boys and 60 girls working on a community service project. They work in groups where each group has the same number of boys and the same number of girls. Q1: What is the first step to finding the greatest number of groups possible? A. Multiply 18 times 60 B. Divide...
*Wednesday, October 8, 2014 at 2:41pm*

**math**

A spinner with three congruent sections is spun with the results as shown. What is P(1)? 1 3 3 2 1 2 1 1 3 3 2 1 1 1 2 2 2 3 3 1 3 A. 1/3 B. 8/21 C. 13/21 D. 3/7 plz help
*Wednesday, October 8, 2014 at 2:36pm*

**math**

four monkeys, ann, bob, carl, don set off to gather bananas. after collecting their bananas, they felt tired and fell asleep. ann woke up first and ate 1/3 of the bananas. bob woke up next and ate 1/3 of the remaining bananas. then carl woke up and ate 1/3 of the remaining ...
*Wednesday, October 8, 2014 at 2:26pm*

**Math, ASAP Please**

What is an Imaginary Number?
*Wednesday, October 8, 2014 at 2:15pm*

**math**

Find the midpoint of the segment with the given endpoints. M(–2, 1) and O(–3, 2) A. (–2.5, 1.5) B. (–0.5, –0.5) C. (0.5, –0.5) D. (–3, –5) any help ??
*Wednesday, October 8, 2014 at 1:58pm*

**math**

Use a calculator to find the given value. Round to four decimal places. sin 21 A. 0.3584 B. 2.7904 C. 0.9336 D. 0.3839 I don't know how to do this...
*Wednesday, October 8, 2014 at 1:53pm*

**Math (Brady??)**

Can you please show me how? What is the value of x? x+4= -9
*Wednesday, October 8, 2014 at 1:52pm*

**math**

The surface area of the top surface of the water in a circular swimming pool is about 206 square feet. Estimate the radius of the pool, to the nearest foot. A. about 14 feet B. about 8 feet C. about 11 feet D. about 10 feet any help?
*Wednesday, October 8, 2014 at 1:10pm*

**Math**

A company manufactures fence sections for residential use. The number, s, of sections that can be produced per day is related to the number of hours, h, of labour required by the function s=2.1 square root h (Show your work) a) State the domain and range for the function. (2 ...
*Wednesday, October 8, 2014 at 12:41pm*

**Math**

Please help. I'm sure I use tan but not able to figure this out. A rectangular prism has base dimensions of 24cm by 7 cm. a metal rod is run from the bottom corner diagonally to the top corner of the prism. If the rod forms an angle if 40 degrees with the bottom of the box...
*Wednesday, October 8, 2014 at 12:09pm*

**math**

andy has 6 2/3 quarts of juice. how many 2/3 cups servings can he pour
*Wednesday, October 8, 2014 at 11:56am*

**math**

STRING LENGTHS: You have two pieces of string. One is 27 cm long. The other is 45 cm long. You want to cut each piece of string into smaller pieces of equal length. Each length is to be a whole number of centimeters. List all the possible lengths of the shorter pieces. What is...
*Wednesday, October 8, 2014 at 11:19am*

**Math-trigonometry**

Please help me with the steps !i don't understand this. The working arm of a tower crane is 192m high and has a length of 71.6 m. Suppose the hook reaches the ground and moves along the arm of the trolley, a) determine max distance from hook to operator when trolley is ...
*Wednesday, October 8, 2014 at 11:08am*

**math**

3+(-4)
*Wednesday, October 8, 2014 at 10:58am*

**math help**

Given f(x) = x 10. What is f(7) i think its -10
*Wednesday, October 8, 2014 at 10:36am*

**math**

The perimeter of a rectangle is 90 cm. Its width is half its length. Which equation could be solved to find the dimensions of the rectangle?
*Wednesday, October 8, 2014 at 10:18am*

**math**

25 – 5x = 80
*Wednesday, October 8, 2014 at 10:18am*

**math (need check answer)**

You are buying balloons for a party. A small balloon cost $3. A large balloon cost $4. Write an algebraic expression for the cost of x small balloons and y large balloons. Then find the total cost for 14 small balloons and 8 large balloons. Q1: An algebraic expression for the ...
*Wednesday, October 8, 2014 at 9:43am*

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