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December 20, 2014

December 20, 2014

**Branches of Math**

**Recent Math Questions**

Post a New Question | Current Questions

**Math**

$2500 is invested in an account that pays 12% interest, compounded continuously. Find the time required for the amount to triple and round the final answer to the nearest tenth of a year.
*Wednesday, November 12, 2014 at 7:56am*

**MATH**

HOW IS ADDITION & SUBTRACTION OF POLYNOMIALS SIMILAR TO ADDITION & SUBTRACTION OF RADICAL EXPRESSIONS?
*Wednesday, November 12, 2014 at 6:24am*

**math please help **

The sales tax oon a $350 computer is $22.75. Find the saes tax rate. 24 red marbles is 40% of _____ marbles.
*Wednesday, November 12, 2014 at 6:16am*

**math**

WHAT PROPERTY OF REAL NUMBERS IS USED IN THE PROCESS OF ADDING AND SUBTRACTING RADICAL EXPRESSIONS?
*Wednesday, November 12, 2014 at 6:03am*

**math algebra**

COULD SOME OF WITH DEGREE IN MATHS HELP ME TO SOLVE THIS SIMULTANEOUS EQUATION PLEASE, PLEASE ? I HAVE RIED DIFFERENT METHODS BUT IT CANNOT GET THE CORRECT ANSWER, AS IN THE BOOK. X-3/4 -Y-2/5 = -1/4 (1) 4-X/3+ 3-Y/2 = - 13/20 (2) 5x-15-4y+8= -1 5x-4y=17-1 8-2x+9-3y= -13 -2x-...
*Wednesday, November 12, 2014 at 5:16am*

**math**

Find the present value, using the present value formula. (Round your answer to the nearest cent.) Achieve $225,500 at 8.45% compounded continuously for 8 years, 145 days.
*Wednesday, November 12, 2014 at 3:43am*

**Math**

In a triangle ABC, with angles A, B, and C and sides AB, BC, and AC, angle B is a right (90°) angle. If the sin of angle A is 0.5 and side BC is 8 inches long, what is the length of side AC?
*Wednesday, November 12, 2014 at 12:52am*

**Math**

Rules on multiplying Monomial to monomials ; Monomial to Binomial : Binomial to Binomial ; Binomial to Trinomial ?
*Wednesday, November 12, 2014 at 12:27am*

**math**

a radio station broadcasts at a frequency of 590,000 . What is the wavelength of the radio waves?
*Tuesday, November 11, 2014 at 11:34pm*

**math**

If the LCM of two numbers is 60, and the difference between the two numbers is 3, what is the pair of numbers?!?!?!?
*Tuesday, November 11, 2014 at 10:59pm*

**math**

f(x)= 1/3x^5 + x^-2 + 3, then f'''(x) is.. I got f'''(x)= 20x^2-24x^-5 Can you tell me if I got this right
*Tuesday, November 11, 2014 at 10:52pm*

**math**

How many 1/4 cups servings are in 5/8 cup?
*Tuesday, November 11, 2014 at 10:31pm*

**math**

what is the better buy one pack of aaa batteries for $5.49 and get a pack free or buy two packs for $2.9.
*Tuesday, November 11, 2014 at 9:34pm*

**math**

which equation is related to the given equation x+13=57
*Tuesday, November 11, 2014 at 8:50pm*

**Math**

Emily and Sarah had a total of $80 dollars. After Sarah spent 1/3 of her money and emily spent $17, emily had twice as much money as sarah. How much more money did Emily have than sarah at first?
*Tuesday, November 11, 2014 at 8:25pm*

**Math**

How to write five times the width in algebraic expression
*Tuesday, November 11, 2014 at 8:14pm*

**Math**

How to right five times the width in algebraic expression
*Tuesday, November 11, 2014 at 8:12pm*

**Math**

Mr. Herman's family is traveling from Brownsville, Texas to their home in Lardeo, Texas. The distance from Brownsville to Laredo is 200 miles. And Mr Herman is driving at a speed of 50 miles per hour. Write an equation for the situation 50x=200
*Tuesday, November 11, 2014 at 8:11pm*

**Math**

Write a numerical expression that represents the sum of 9 squared and 35
*Tuesday, November 11, 2014 at 8:08pm*

**Math**

If you cut 50m of rope into three pieces in the ratio of 5: 8: 7. What was the length of the shortest piece
*Tuesday, November 11, 2014 at 7:38pm*

**math 118**

24 cars needs to be painted three deference colors out of 64 kinds of colores how many is done many is done
*Tuesday, November 11, 2014 at 7:29pm*

**Math**

Marty has a fenced yard in the shape of a rectangle. Its area is 635.4 square feet. The width of the yard is 18 feet. What is the length of the fence?
*Tuesday, November 11, 2014 at 7:18pm*

**7th grade math**

Two step equations: Vincent started the year with $254 in his account at the health spa. Each time he uses the spa, $15 is taken out of the account. How many more times can he use the spa if he has already had $180 taken out of his account this year? I mostly just need to know...
*Tuesday, November 11, 2014 at 7:14pm*

**Math**

A Gentoo penguin can swim at a rate of 17 miles per hour how many miles can a penguin swim in 4 hours use the expression rt where r represents rate and t represents time
*Tuesday, November 11, 2014 at 7:01pm*

**math**

-7.8 = 4.4 + 2r
*Tuesday, November 11, 2014 at 6:47pm*

**math**

-7.8 = 4.4 =2r
*Tuesday, November 11, 2014 at 6:44pm*

**Math Help!!!**

Solve the proportion. Round to the nearest hundreth, where necessary. 32/?=20/25 A. 37 B. 16 C. 26 D. 40 Is the answer D?
*Tuesday, November 11, 2014 at 6:22pm*

**Math Help!!!**

Solve the proportion. Round to the nearest hundreth, where necessary. 27/90=3/? A. 3 B. 10 C. 9 D. 27 Is the answer B?
*Tuesday, November 11, 2014 at 6:17pm*

**Math Help!!!**

Solve the proportion. Round to the nearest hundreth, where necassary. 9/4=?/12 A. 54 B. 36 C. 45 D. 27 D?
*Tuesday, November 11, 2014 at 6:08pm*

**Math Help!!!**

Triangle A and triangle B are similar. The perimeter of trianlge A is 15 m and the perimeter of triangle B is 30 m. What is the ration of the perimeter of triangle B to the perimeter of triangle A? A. 2:1 B. 3:1 C. 3:2 D. 5:3 Is the answer D?
*Tuesday, November 11, 2014 at 5:52pm*

**Math**

Whats the 2nd derivative of 4xsecx I got 4secxtanx+8xsecxtan^2x
*Tuesday, November 11, 2014 at 5:45pm*

**Math**

How do you use a trend line in math
*Tuesday, November 11, 2014 at 5:44pm*

**Math**

Estimate the product by finding two answers the exact answer is between 7x 3,289
*Tuesday, November 11, 2014 at 5:41pm*

**Math**

Mr. Herman's family is traveling from Brownsville, Texas to their home in Lardeo, Texas. The distance from Brownsville to Laredo is 200 miles. And Mr Herman is driving at a speed of 50 miles per hour. Write an equation for the situation 50x=200
*Tuesday, November 11, 2014 at 5:41pm*

**Math Help!!!**

The triangles below are similar. Find the value of x. The first triangle has 14 on the right and left side and 18 on the bottom. The second triangle has 7 on the right and left side and x on the bottom. A. 9 B. 8 C. 10.5 D. 11 Is the answer B?
*Tuesday, November 11, 2014 at 5:39pm*

**math**

Paul has two thirds as many postcards and shawn the number of postcards shawn has three fifths of a number of postcard tim has if three boys have 280 postcards altogether how many more postcards does Tim have than Paul
*Tuesday, November 11, 2014 at 5:36pm*

**Math**

X Number Of Months 1 2 3 4 Y Total Charges 170 230 290 350 What is the independent quantity? What is the dependent quantity? I know that independent means the one that changes. Would the total charges be independent
*Tuesday, November 11, 2014 at 5:33pm*

**Urgent Math Help**

Solve for x: 1.) ln√x-8=5 2.) log2x+log2(x+2)=log2(x+6)
*Tuesday, November 11, 2014 at 5:31pm*

**Math Help!!!**

Use cross products to determine which of the following pairs of ratios cannot form a proportion. A. 1/3*3/9 B. 2/3*4/9 C. 2/3*4/6 D. 1/3*2/6 Is the answer B?
*Tuesday, November 11, 2014 at 5:22pm*

**Math**

Hi! Could someone possibly help me solve this?; log2(x+4)=log2(x^2+2). For my answer, I got "All Real Numbers" or x=0 but I'm not sure if that's right. Thanks a bunch! :)
*Tuesday, November 11, 2014 at 5:18pm*

**Math Help!!!**

Find the unit rate for the situation. 360 km in 6 h A. 60 km/h B. 120 km/h C. 62 km/ h D. 61 km/h Is the answer A?
*Tuesday, November 11, 2014 at 5:01pm*

**Math Help!!!**

The price of 10 ounces of crackers is $3.00. What is the unit price? Round your answer to the nearest cent. A. $0.15 per ounce B. $0.30 per ounce C. $0.60 per ounce D. $0.90 per ounce Is the answer B? Thank you
*Tuesday, November 11, 2014 at 4:47pm*

**Math Help!!!**

In a sports equipment locker, there are 81 balls and 45 baseball mitts. Write the ratio of balls to baseball mitts in simplest form. A. 9:5 B. 10:18 C. 10: 5 D. 9:18 Is the answer A?
*Tuesday, November 11, 2014 at 4:33pm*

**math**

order from least to greatest: answer: .001 , 0.01 , 0.1
*Tuesday, November 11, 2014 at 4:27pm*

**Math**

How long is a rectangle field with a width of 3/5 mile and an area if 21/50 square mile? Use the formula A=lw to find the missing length.
*Tuesday, November 11, 2014 at 4:23pm*

**Math**

How do I find the value of this expression? 2+6*2^2
*Tuesday, November 11, 2014 at 4:18pm*

**Math Help!!!**

Write the following ratio in simplest form: 32 min: 36 min A. 8:9 B. 8:36 C. 32:9 D. 128:144 Is the answer A? Thank you
*Tuesday, November 11, 2014 at 4:12pm*

**math**

a piece of wood is 7 1/4 feet long. how many 2 foot long pieces can sue cut from the wood? 1 2 3 4
*Tuesday, November 11, 2014 at 4:02pm*

**math**

3. Stephen’s family had a reunion last weekend. If there were 24 family members and 8 apple pies cut into 6 slices, what answer choice represents the fraction of one apple pie that each family member received? 1/3 2/3 ¼ 1/6
*Tuesday, November 11, 2014 at 3:21pm*

**Math**

Would two congruent triangles still be congruent if one is reflected across the x-axis?
*Tuesday, November 11, 2014 at 3:04pm*

**math**

If X = 4 units, Y = 11 units, and Z = 6 units, then what is the volume of the rectangular prism shown above
*Tuesday, November 11, 2014 at 2:49pm*

**math**

Use Green's Theorem to evaluate F(x, y) = y cos x − xy sin x, xy + x cos x , C is the triangle from (0, 0) to (0, 4) to (2, 0) to (0, 0) I kind of understand how to do this , but I am having trouble with the trig
*Tuesday, November 11, 2014 at 2:43pm*

**Math**

Prove that the triangles with the given vertices are congruent. A(3, 1), B(4, 5), C(2, 3) and D(–1, –3), E(–5, –4), F(–3, –2)
*Tuesday, November 11, 2014 at 2:41pm*

**math**

handi divided a board that is 52 inches long into two equal pieces.to find the length of each piece,she used the division expreesion 52 divided by two
*Tuesday, November 11, 2014 at 2:14pm*

**Math**

How do I find the value of the expression? 2+(6x2)^
*Tuesday, November 11, 2014 at 1:57pm*

**Math**

A track is 200 meters long. How many times must Julius run around the track to run 3 kilometers?
*Tuesday, November 11, 2014 at 1:44pm*

**math**

Use Green's Theorem to evaluate the line integral along the given positively oriented curve. integral of xy2 dx + 4x2y dy C is the triangle with vertices (0, 0), (2, 2), and (2, 4)
*Tuesday, November 11, 2014 at 1:10pm*

**math**

kade bought 6 cookies for $4.80. At this rate, which equation can be used to find c, the cost of 3 dozen cookies?
*Tuesday, November 11, 2014 at 12:44pm*

**math**

Suppose you have cards with the digits from 0 to 9, one card for each digit. Complete the following calculation using all of the cards. Explain how you went about getting your digits/answer.
*Tuesday, November 11, 2014 at 11:58am*

**Math**

There are two cousins. One cousin is 3 times older than the other. Their total age if added together total 36. How old are the cousins
*Tuesday, November 11, 2014 at 10:55am*

**math**

what is the least common multiple of 6 and 23? I got 138 am I correct
*Tuesday, November 11, 2014 at 8:55am*

**math**

the traffic signal at 4th and main turns green every 6 minutes. the signal at 5th and broadway turns green every 4 minutes. if both turned green at 12:15 p. m., when are the next three times that both will turn green at the same time?
*Tuesday, November 11, 2014 at 8:53am*

**Math**

Marti works Monday through Saturday, so she has a day off once every 7 days. She needs to give her dog some medicine every 5 days. How often does she give her dog medicine on her day off?
*Tuesday, November 11, 2014 at 8:48am*

**Math **

Find the exact value and approximate. 11^ -x+4 = 5^ 3x-2 (-x+4)log11 = (3x-2)log5
*Tuesday, November 11, 2014 at 2:42am*

**Math**

If the temperature fell 11 degrees from a low of 6 degrees, the temperature would now be??
*Tuesday, November 11, 2014 at 1:53am*

**math**

if a ball is selected at random from an urn containing two red balls, three white balls and five blue balls, what is the probability that it will be a white ball
*Monday, November 10, 2014 at 11:44pm*

**Math**

joanne earns $720 a week. She spends 1/3 of her money grocery and household goods and 3/4 of the remaining money on rent. How much money does she spends on rent, groceries and household goods?
*Monday, November 10, 2014 at 11:38pm*

**Math**

Prove the identity: sec^4x - tan^4x = 1+2tan^2x
*Monday, November 10, 2014 at 11:21pm*

**Math**

The ribbon on a spool is 10 yards long. How many 6 inch pieces of ribbon can be cut from the spool?
*Monday, November 10, 2014 at 10:13pm*

**Math**

Madeline had a class ratio of 5:4 boys to girls in her classroom. If there were 27 kids in her class how many girls were there?
*Monday, November 10, 2014 at 10:06pm*

**Math**

Diane took a math test. The ratio of the number of problems Diane got incorrect to the number of problems she got correct was 2:7. If the test had 36 questions on it, how many problems did she get correct?
*Monday, November 10, 2014 at 10:05pm*

**math**

A bag contains n cards, each having one of the consecutive numbers (1, 2, 3, 4, .... n) written on it, with each number being used once. The probability of drawing a card with a number less than or equal to 10 is 4/10. How many cards are in the bag?
*Monday, November 10, 2014 at 9:16pm*

**Math**

Katie measures that 6 1/2 pieces of model plane parts were five in one fifth inches long how long is each piece
*Monday, November 10, 2014 at 8:40pm*

**math**

LEGO R bricks are very common toys and have a structure that allows them to be placed on a rectangular grid. This makes them great for interesting questions about math. A 24 brick has two rows and four columns, making it have 8 total studs. But a 24 is the same as a 4...
*Monday, November 10, 2014 at 8:22pm*

**Math help please!!!!!**

The triangles below are similar figures. Use a proportion to find the length of X.The longer triangle has 16 on the left side,6 on the bottom inside it says 120 degrees and at the top it says 25 degrees.The smaller triangle says x on the right, 5 on the bottom 120 degrees in ...
*Monday, November 10, 2014 at 7:52pm*

**Math help please!!!!!**

The triangles below are similar figures. Use a proportion to find the length of X.The longer triangle has 16 on the left side,6 on the bottom inside it says 120 degrees and at the top it says 25 degrees.The smaller triangle says x on the right, 5 on the bottom 120 degrees in ...
*Monday, November 10, 2014 at 7:20pm*

**Math**

Mindy picked 4 times as many daisies as tulips for a flower bouquet. She picked a total of 20 flowers. How many more daisies than tulips did she pick?
*Monday, November 10, 2014 at 6:57pm*

**Math help please!!!!!**

The ladders shown below are standing against a wall at the same angle.How high up the wall does the longer ladder go?(All meausurements are in feet.) The long side of the big ladder ie 30 and the other side is X. Smaller ladder is 24 and 10. A.11.25ft B.12.5ft C.14 ft D.14ft ...
*Monday, November 10, 2014 at 6:55pm*

**Math**

how much space do sleeping quarters take if the sleeping quarters are for 100 guests and average density of the sleeping quarters are 15kg/m2
*Monday, November 10, 2014 at 6:33pm*

**Math please help**

Use the limit process to find the slope of the graph of sqrt(x + 8) at (8, 4).
*Monday, November 10, 2014 at 6:32pm*

**Math, Please Help!**

If three cards are drawn at random from a standard deck of 52 playing cards, what is the probability that at least one of the cards is a face card: that is, one of the cards is a kind, queen, or jack?
*Monday, November 10, 2014 at 6:18pm*

**Math please help**

Use the limit process to find the slope of the graph of sqrt(x + 8) at (8, 4).
*Monday, November 10, 2014 at 6:15pm*

**Math**

Horse race has 14 entrees with no ties what's probability of 4 horses owned by one owner to come in 1st, 2nd, 3rd, 4th.
*Monday, November 10, 2014 at 6:15pm*

**Math**

a lab has two bacterial cultures. culture a contains 8×10^4 bacteria and culture B contains 4 × 10^6 bacteria. How do the two cultures compare in size?
*Monday, November 10, 2014 at 6:01pm*

**math**

What is 56,930 expressed in scientific notation?
*Monday, November 10, 2014 at 5:09pm*

**Math**

The ribbon on a spool is 10 yards long. How many 6 inch pieces of ribbon can be cut from the spool?
*Monday, November 10, 2014 at 4:57pm*

**Math Pre Calc Help**

(cos^4x -sin ^4 x)/(sin^2x)=cot^2x -1 How to prove true?
*Monday, November 10, 2014 at 4:39pm*

**MATH**

The 2 digits in the mystery number have a sum of 6. you say this mystery number if you count by 3`s or count by 4`s. What is the mystery number?
*Monday, November 10, 2014 at 4:36pm*

**Math**

If Charlie is 6 1/3 ft tall, Dan is 6 5/12 ft tall and Mark is 6 1/6 ft tall, who is the tallest? I say Dan is the tallest, am I right? Thank You for any help you can give me on this.
*Monday, November 10, 2014 at 4:33pm*

**Math**

mystery numberis an even number. the number is greater than 30 and less than 50, the sum of the digits is 6. what is the mystery number?
*Monday, November 10, 2014 at 4:32pm*

**Math**

How would you order the following from least to greatest? 1/4, 0.2, 3/8, 30% Would it be 0.2, 1/4, 30% and 3/8? This was my answer but it was marked wrong? Where did I go wrong? Thanks for your help
*Monday, November 10, 2014 at 4:29pm*

**Math**

Kimberly uses 1 cup of walnuts for every 2 cups of raisins when making trail mix. How many cups of walnuts will she need if she uses 8 cups of raisins.
*Monday, November 10, 2014 at 4:25pm*

**Math**

What does 12 (with a little2 beside the big 2) equal in standard form?
*Monday, November 10, 2014 at 4:14pm*

**math/area**

use the limit process to find the area of the region between f(x) = x^2 + 2 a interval [0, 3]
*Monday, November 10, 2014 at 4:10pm*

**math/limits**

use the limit process to find the area of the region between f(x) = x^2 + 2 a interval [0, 3]
*Monday, November 10, 2014 at 4:10pm*

**Math**

(cos^4x -sin ^4 x)/(sin^2x)=cot^2x -1
*Monday, November 10, 2014 at 3:51pm*

**College Math**

An object is projected vertically upward with an initial velocity of v0 ft/sec, and its distance s(t) in feet above the ground after t seconds is given by the formula s(t) = −16t^2 + v0t. (a) If the object hits the ground after 8 seconds, find its initial velocity v0. v0...
*Monday, November 10, 2014 at 3:07pm*

**Math**

Suppose you have a ladder leaning vertically on a wall, and the ladder slips down along the wall to the floor. Consider the point in the center of the ladder. What curve will it draw in the air as the ladder slides down the wall?
*Monday, November 10, 2014 at 3:05pm*

**Math **

Find the standard equation of a parabola that has a vertical axis and satisfies the given conditions. x-intercepts −2 and 8, highest point has y-coordinate 5
*Monday, November 10, 2014 at 3:05pm*

**Math**

Ozone occurs at all levels of Earth's atmosphere. The density of ozone varies both seasonally and latitudinally. At a given city, the density D(h) of ozone (in 10^−3cm/km) for altitudes h between 20 kilometers and 35 kilometers was determined experimentally. For the ...
*Monday, November 10, 2014 at 3:04pm*

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