Wednesday

April 23, 2014

April 23, 2014

**Branches of Math**

**Recent Math Questions**

Post a New Question | Current Questions

**Math**

How can you arrive at the distance between nail holes in string art. Mathematical concepts observed in string art
*Saturday, April 5, 2014 at 7:37pm*

**Math**

Good old Pythagoras's theorem says that: ds^2 = dx^2 + dy^2 We can write: dx = [-5 sin(t) + 5 sin(5t)] dt dy = [5 cos(t) - 5 cos(t)] dt ds^2 = dx^2 + dy^2 = (using sin^2(x) + cos^2(x) = 1 twice for x = t and x = 5t) 25 [2 - 2 sin(t) sin(5t) - 2 cos(t) cos(5t)] dt^2= 50 [1...
*Saturday, April 5, 2014 at 7:37pm*

**Math**

You're welcome.
*Saturday, April 5, 2014 at 7:33pm*

**Math**

Ok no problem thank you!
*Saturday, April 5, 2014 at 7:32pm*

**Math**

Sorry -- I goofed. Yes, it's 192.
*Saturday, April 5, 2014 at 7:28pm*

**math**

10/1000 = x/50000 1000x = 500,000 x = 500
*Saturday, April 5, 2014 at 7:27pm*

**math**

If a 1,000 unit vitamin D is equal to 10 glasses of milk how many glasses are in a 50,000 unit vitamin D?
*Saturday, April 5, 2014 at 7:20pm*

**Math**

The surface area of a prism is 54 square inches. What is the surface area of a similar prism that is smaller by a scale of 1/3?
*Saturday, April 5, 2014 at 7:09pm*

**Math**

Ms.Sue wouldn't it be 192?
*Saturday, April 5, 2014 at 7:04pm*

**Math**

1 lb. = 16 oz. 1 gal = 4 qt. 768 oz/4 qt. 198 oz / qt
*Saturday, April 5, 2014 at 6:41pm*

**math**

36 * 16 * 7.5 = ?
*Saturday, April 5, 2014 at 6:34pm*

**Math**

Can someone help me with this? Convert: 48lb/gal=____oz/qt
*Saturday, April 5, 2014 at 6:34pm*

**math**

On a rectangular piece of cardboard with perimeter inches, three parallel and equally spaced creases are made (see Figure 1). The cardboard is then folded along the creases to make a rectangular box with open ends (see Figure 2). Letting represent the distance (in inches) ...
*Saturday, April 5, 2014 at 6:29pm*

**Math**

Find the exact length of the curve. x = 5cost - cos5t, y = 5sint - sin5t, 0 < t < pi
*Saturday, April 5, 2014 at 5:54pm*

**math**

A rental agent is renting a space for $7.50 a square foot. If you require a space 36 ft. by 16 ft., what will be the rental on that space?
*Saturday, April 5, 2014 at 5:49pm*

**math (?)**

No figure given. Cannot copy and paste here.
*Saturday, April 5, 2014 at 5:29pm*

**math**

Take west to be the positive direction. The height of a sloped roof above the place where I stand is h = 12 feet (see the figure below). If I move 3 feet west, the height is 10 feet. If I move 2 additional feet west, what is the height of the roof above the place where I stand?
*Saturday, April 5, 2014 at 5:24pm*

**math**

first .2*9.45 = 1.89 remaining length = 9.45 - 1.89 = 7.56 so piece 2 + (piece 2 - .12) = 7.56 2 * piece 2 = 7.68 piece 2 = 3.84
*Saturday, April 5, 2014 at 4:48pm*

**math**

a rope was 9.45 meters. the length of the first piece of rope was 1/5 of the original length. the second piece of rope was 0.12 meter longer than the third piece.how long was the second piece of rope
*Saturday, April 5, 2014 at 3:35pm*

**math**

Use logarithmic differentiation to find the derivative of the function. y = (cos 2x)x
*Saturday, April 5, 2014 at 11:34am*

**math**

what does sin2x/cos2x equal to?
*Saturday, April 5, 2014 at 11:28am*

**math**

y = vt - 4.9t^2 max height h is at t = v/9.8, so h = v^2/19.6 v^2 = 50*19.6 v = 31.3 m/s
*Saturday, April 5, 2014 at 10:47am*

**math**

poop
*Saturday, April 5, 2014 at 9:03am*

**math**

When a stone is thrown upwards with an initial velocity of v metres per second, it reaches a maximum height of h metres. h is directly proportional to the square of v. Calculate the value of v when h = 50 Please help
*Saturday, April 5, 2014 at 6:49am*

**math**

x + x+30 = 90
*Saturday, April 5, 2014 at 5:39am*

**Math**

no,no,yes
*Saturday, April 5, 2014 at 5:36am*

**Math**

i) no ii) no iii) yes, as always
*Saturday, April 5, 2014 at 5:35am*

**math**

you know that ∫ e^u du = e^u so, let u = sec(2x) now you're almost there.
*Saturday, April 5, 2014 at 5:34am*

**math**

Evaluate the indefinite integral of the following function, e^sec2x sec2xtan2x dx
*Saturday, April 5, 2014 at 3:53am*

**Math**

"If a quadrilateral is a rectangle, then it is a parallelogram." i) is the converse true? ii) is the inverse true? iii) is the contrapositive true?
*Saturday, April 5, 2014 at 2:53am*

**Math**

If you are given a conditional statement that you know is true, can you predict whether i) the converse is true? ii) the inverse is true? iii) the contrapositive is true?
*Saturday, April 5, 2014 at 2:52am*

**math**

Two angles are complementary. One contains 30° more than the other. Find both angles. The measures of the angles are _ degrees
*Saturday, April 5, 2014 at 1:58am*

**math**

If the angle of declination is known, a surveyor would use_______ to find the length x. The cosine of a 50° angle is_______ this represents the value created when length x is divided by 90 feet. If the angle of declination changed to 60°, the cosine would be 0.5; now ...
*Saturday, April 5, 2014 at 1:47am*

**math**

WHAT IS THE ANSWER
*Friday, April 4, 2014 at 11:46pm*

**math**

No.
*Friday, April 4, 2014 at 10:02pm*

**math**

2 1/4
*Friday, April 4, 2014 at 9:19pm*

**math**

The Smiths want to buy a 9 ft. by 12 ft. carpet and center it in a 15 ft. by 20 ft. room. Can a 3 1/2 foot by 12 foot couch be placed against one of the long walls of the room without touching the carpet?
*Friday, April 4, 2014 at 9:10pm*

**business Math**

(115-100)/100 = 0.15 = 15%.
*Friday, April 4, 2014 at 7:31pm*

**Business Math**

I = Po*r*t = $1.307 45,000*(0.04/365)*t = 1307 Solve for t in days. NOTE: Exact interest is based on 365 days per year instead of 360 days.
*Friday, April 4, 2014 at 7:26pm*

**Math, Geomertry**

Thank you
*Friday, April 4, 2014 at 5:31pm*

**Math, Geomertry**

given the distance between centers, the distance from the center of the moon to the surface of the earth is 248740 miles. The distance from the center of the sun to the center of the moon is thus 93000000-248740 = 92751260 miles. At that distance, the moon casts a shadow (...
*Friday, April 4, 2014 at 5:18pm*

**Math**

6
*Friday, April 4, 2014 at 5:17pm*

**Math, Geometry**

The percent grade of a highway is the amount that the highway raises or falls in a given horizontal distance. For example, a highway with a four percent grade rises 0.04 mile for every 1 mile of horizontal distance. a. How many feet does a highway with a six percent grade rise...
*Friday, April 4, 2014 at 5:01pm*

**Math, Geomertry **

A piece of a broken wheel is shown. It was taken to a machine shop to be replaced with a new “whole” wheel. Find the radius of the wheel AC=10cm, BD=3 cm and D is the midpoint of AC. Round to the nearest hundredth.
*Friday, April 4, 2014 at 4:59pm*

**Math, Geomertry **

A total solar eclipse occurs when the moon passes between the earth and the sun, and the darkest shadow cast by the moon, called the umbra, hits the surface of the earth. If the umbra does not hit the surface, as shown in the following figure, then a total solar eclipse is not...
*Friday, April 4, 2014 at 4:58pm*

**MATH**

16 = 128/8 3 5/8 = 29/8 128-29 = 99 ...
*Friday, April 4, 2014 at 4:26pm*

**MATH**

Ella ordered 16 pizzas for a p. After the party,, there were 3 5/8 pizzas left. How much pizza was eaten? solve the problem
*Friday, April 4, 2014 at 4:04pm*

**Math**

Here's a really tough question on Probabilities which I found on SnapQuiz! snapquiz.sg/viewQuestion.html?id=277 Is anyone able to explain the answer better?
*Friday, April 4, 2014 at 1:58pm*

**math**

Total sales = 1,665,500 Total costs = 925,400 Subtract.
*Friday, April 4, 2014 at 1:36pm*

**math**

The PJC department of McIntyre Company shows gross sales of $730,600 for computer supplies and $934,900 for general office supplies. It has determined that computer supplies cost $534,000 and that general office supplies cost $391,400. What is the total gross profit for the ...
*Friday, April 4, 2014 at 1:31pm*

**Math 2 (?)**

What diagram? Cannot copy and paste here.
*Friday, April 4, 2014 at 12:37pm*

**math**

Cannot draw diagrams here.
*Friday, April 4, 2014 at 12:36pm*

**math**

If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events.
*Friday, April 4, 2014 at 12:36pm*

**Math**

(1/4) / 3 (1/4) * (1/3) = 1/12
*Friday, April 4, 2014 at 12:30pm*

**Math (?) **

What squares? What is your question?
*Friday, April 4, 2014 at 12:25pm*

**Math**

a. 400 + 100 + 2n = 7n b. 400 + 100 + 2n = 6n Solve for n.
*Friday, April 4, 2014 at 12:24pm*

**Math**

one fourth of a box of cereal was shared equally among 3 people how much cereal did each person get ?
*Friday, April 4, 2014 at 12:14pm*

**Math (?)**

No wall shown. Cannot copy and paste here.
*Friday, April 4, 2014 at 12:13pm*

**Math**

a wall in front of a house is shown below if 3/5 of the wall is brick how do you determine the height of the brick portion of the wall
*Friday, April 4, 2014 at 12:03pm*

**Math - insufficient information**

Nobody knows because the interest rate isn't stated.
*Friday, April 4, 2014 at 11:59am*

**math**

i dont know
*Friday, April 4, 2014 at 9:37am*

**math**

A customer earned $3,262.50 interest on a 9-month CD. How much was the opening deposit?
*Friday, April 4, 2014 at 9:37am*

**Math? Science?**

??
*Friday, April 4, 2014 at 7:39am*

**math lit,business studies,accounting and computer**

Certainly.
*Friday, April 4, 2014 at 7:38am*

**math lit,business studies,accounting and computer **

Can I be an accountant when doing these subjects?
*Friday, April 4, 2014 at 7:35am*

**math**

you've posted a bunch of these basic interest problems, and had them done for you. How about showing us what you've learned?
*Friday, April 4, 2014 at 5:44am*

**math**

convert all to decimal, then it's easy 0.25 = 0.25 1/3 = 0.33 3/4 = 0.75 49% = 0.49
*Friday, April 4, 2014 at 5:38am*

**MATH**

810/1080 * 4 = 3 years 4/3 as many boys, 3/4 as many years
*Friday, April 4, 2014 at 5:37am*

**MATH**

IF 810 BOYS WEED A PLOT OF LAND IN 4 YEARS, HOW MANY YEARS WOULD IT TAKE 1080 BOYS TO WEED THAT SAME PLOT OF LAND?
*Friday, April 4, 2014 at 5:25am*

**math **

Put 0.25 1/3 3/4 & 49% in order from least to greatest
*Friday, April 4, 2014 at 3:20am*

**Math **

A piece of a broken wheel is shown. It was taken to a machine shop to be replaced with a new “whole” wheel. Find the radius of the wheel AC=10cm, BD=3 cm and D is the midpoint of AC. Round to the nearest hundredth.
*Friday, April 4, 2014 at 1:26am*

**math**

As a savings plan for college, when their son Bob was born, the Wilburs deposited $10,000 in an account paying 8% compounded annually. How much will the account be worth when Bob is 18 years old?
*Friday, April 4, 2014 at 1:18am*

**Math **

The curvature of a circle with radius r is defined as Descartes’ formula gives a relationship between the curvatures of the four circles. What are Descartes’ formula and the curvature of a circle? What does the sign of the curvature of a circle mean? State Descartes...
*Friday, April 4, 2014 at 1:16am*

**Math**

Each square represents 625 square feet, each line segment represents 25 feet. A galapagos tortoise must use 550 feet of fencing to enclose a space of 15,000.
*Friday, April 4, 2014 at 1:16am*

**Math **

An organization is planning a dance. The band will cost $400 and advertising costs will be $100. Food will be supplied at $2 per person. a. How many people need to attend the dance in order for the organization to break even if tickets are sold at $7 each? b. How many people ...
*Friday, April 4, 2014 at 1:15am*

**Math **

The percent grade of a highway is the amount that the highway raises or falls in a given horizontal distance. For example, a highway with a four percent grade rises 0.04 mile for every 1 mile of horizontal distance. a. How many feet does a highway with a six percent grade rise...
*Friday, April 4, 2014 at 1:14am*

**math**

the compound amount on an investment of $8,500 at 12% interest, compounded quarterly, for 1 year.
*Friday, April 4, 2014 at 1:06am*

**math**

he compound amount on an investment of $8,500 at 12% interest, compounded quarterly, for 1 year.
*Friday, April 4, 2014 at 1:05am*

**math**

looks like there was a 20% discount, plus 6% tax.
*Friday, April 4, 2014 at 12:11am*

**Math**

Tn = -3n
*Thursday, April 3, 2014 at 11:52pm*

**Math**

what is the 93rd equation
*Thursday, April 3, 2014 at 11:34pm*

**Math - Algebra2**

f(x)=3x+2 , g(x)=3/x^2+2 , h(x)=sqrt(x-2) (f∘g)(-5) to me means: f (g(x) ) so f(g(5)): g(-5) = 3/27 = 1/9 f(1/9) = 3(1/9) + 2 = 1/3 + 2 = 5/3 (f∘g)(-5) = 5/3 so the others the same way
*Thursday, April 3, 2014 at 10:26pm*

**Math - Algebra2**

Given the functions: f(x)=3x+2 g(x)=3/x^2+2 h(x)=sqrt(x-2) Find the following a) (f∘g)(-5) b) (h∘g)(3) c) (g∘g)(-2) d) (f∘h)(12) Thanks
*Thursday, April 3, 2014 at 10:19pm*

**math**

You're welcome, Ezekiel.
*Thursday, April 3, 2014 at 9:36pm*

**math**

thanks Ms. Sue.
*Thursday, April 3, 2014 at 9:30pm*

**math**

Right.
*Thursday, April 3, 2014 at 9:20pm*

**Math**

1 meter = 10 decimeters
*Thursday, April 3, 2014 at 9:18pm*

**math**

1.06(0.8n)represents the total paid for a jacket. What does this represent about the cost of the jacket?
*Thursday, April 3, 2014 at 9:13pm*

**math**

Alice has 1/5 as many cars as Sylvester has. Sylvester has 35 cars. How many cars does Alice have? My answer is 7 cars
*Thursday, April 3, 2014 at 9:07pm*

**math**

peanuts
*Thursday, April 3, 2014 at 9:05pm*

**Math**

The great white shark can grow can to a length of 4.9m. The mako shark can grow to a length of 40 dm. Which shark can grow to the greater length?
*Thursday, April 3, 2014 at 9:01pm*

**math**

48inches by 30inches
*Thursday, April 3, 2014 at 8:20pm*

**Math**

Note that 4x^2 and 9 are both perfect squares, so the first thing I'd try is (2x+3)^2 good guess!
*Thursday, April 3, 2014 at 7:51pm*

**Math - Int Trig**

I'll do one. Do the others in like wise. If you get stuck, come on back with what you did. (g∘h) = 3/(h^2+2) = 3/(x-2+2) = 3/x (g∘h)(-2) = 3/-2 = -3/2 The domain of h is x>=2 The domain of g is all reals, since x^2+2 is never zero. So, the domain of (g∘...
*Thursday, April 3, 2014 at 7:47pm*

**Math**

Solve by factoring: 4x^2+12x+9=0
*Thursday, April 3, 2014 at 7:47pm*

**Math - Int Trig**

I can't edit but f(x) is suppose to be f(x)=3x+2 I put 2x by mistake!
*Thursday, April 3, 2014 at 7:46pm*

**Math - Int Trig**

Given the functions: f(x)=2x+2 g(x)=3/x^2+2 h(x)=sqrt(x-2) Find the following 1) (f∘g)(-5) 2) (h∘g)(3) 3) (g∘h)(-2) 4) (g∘g)(-2) 5) (f∘h)(12) Find the following and state the domain: 6) h∘g 7) f∘g 8) g∘f 9) g∘g 10)g∘h
*Thursday, April 3, 2014 at 7:43pm*

**math**

3500((1+.12/4)^4 - 1) = 439.28
*Thursday, April 3, 2014 at 7:26pm*

**math**

If you look at the table, you should find a value of 1500(1+.12/4)^(4*8) = 3862.62
*Thursday, April 3, 2014 at 7:25pm*

**math**

subtract the smaller rectangle from the larger. The remainder is the area covered by the frame. 28*24 - 24*20 = ? or, rewriting things a bit, 28*24 - 20*24 = 8*24 = ?
*Thursday, April 3, 2014 at 7:24pm*

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