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October 24, 2014

October 24, 2014

**Branches of Math**

**Recent Math Questions**

Post a New Question | Current Questions

**Math**

Suppose sinA = 12/13 with 90º≤A≤180º. Suppose also that sinB = -7/25 with -90º≤B≤0º. Find cos(A - B).
*Tuesday, October 14, 2014 at 2:17pm*

**Stasticstics/math**

A teacher wants to compare the mean geology scores of two different classes. She is testing the null hypothesis that there is no difference in the population mean scores of the two classes. The difference of the sample means is 51.4. If the standard deviation of the ...
*Tuesday, October 14, 2014 at 1:53pm*

**Foundations and Pre-Calculus Math 10**

Find the radius of a cone with a height of 3m and a volume of 30m cubed. So far I have 90m cubed / 3m = pi(r^)3m/3m. Then I get stuck. Help! I'm really bad at math. ):
*Tuesday, October 14, 2014 at 1:30pm*

**Math**

Hi I really need help. I don't know even how to figure these two questions out so if you could help me, please. Is (–4, 10) a solution to the equation 10 – 5x = y? Explain your answer. Describe the pattern in the table using an equation. x|y 1|15 2|25 3|35 4|45 ...
*Tuesday, October 14, 2014 at 1:17pm*

**math**

In a suspension bridge, the shape of the suspension cables is parabolic. The bridge shown in the figure has towers that are 400 m apart, and the lowest point of the suspension cables is 100 m below the top of the towers. Find the equation of the parabolic part of the cables, ...
*Tuesday, October 14, 2014 at 12:24pm*

**Math**

what is 603kg = ? g. I don't get how to do the problem
*Tuesday, October 14, 2014 at 12:17pm*

**Math**

A sphere has a volume of 200m3 . What is the volume of the smallest cube that this sphere would fit inside of? (Hint: try drawing a diagram of a side or top view of this situation)
*Tuesday, October 14, 2014 at 11:39am*

**Math 116**

If the length of a rectangle is increased by 10% and the width of the rectangle is decreased by 10%, is the area changed? If so, does it increase or decrease and by what percent? Explain your answer.
*Tuesday, October 14, 2014 at 11:32am*

**Math 130**

Can i find the perimeters of the following figures Square Rectangle and Circle
*Tuesday, October 14, 2014 at 10:26am*

**Math **

Larry and Gary are discussing whose garden has the most area to plant flowers. Larry claims that all they have to do is walk around the two gardens to get the perimeter and the one with the greatest perimeter has the greatest area. How would you help these students?
*Tuesday, October 14, 2014 at 10:15am*

**3 grade math**

How can I find the area of an angle?" How do you respond?
*Tuesday, October 14, 2014 at 9:54am*

**Math**

If john makes 60 k a year , how much does he make each month?
*Tuesday, October 14, 2014 at 9:23am*

**Math**

ABCDEF is a regular hexagon. If BA and CD are extended until they intersect, what is the measure of the angle formed?
*Tuesday, October 14, 2014 at 8:55am*

**math prajishaa**

if 10% is vat is charged on an article bought by sandeep for rupees 6930 what is the selling price of the article
*Tuesday, October 14, 2014 at 8:40am*

**math usha kk**

a refrigerator is marked at rupees 14500 if 16%vat is charged find the total amount that she will have to pay to the shopkeeper
*Tuesday, October 14, 2014 at 8:35am*

**math prasad vk**

by selling a saree for rupees 2000 the shopkeeper made a profit of 20% what was the cost price of the saree
*Tuesday, October 14, 2014 at 8:24am*

**math school g**

salman purchased 8 wood panels for rupees 1500 each for transporting them to his shop he had spend rupees 800 he then gave the panels a veneer wich cost him rupees 8000 he sold 4 panels for rupees 3200 each calculate his total profit or loss %
*Tuesday, October 14, 2014 at 8:09am*

**Math**

Are the statements Always, Sometimes or Never. Please explain why. Thanks. 1. An equilateral polygon is regular. 2. The greater the number of sides of a regular polygon, the smaller the measure of any of its exterior angle. 3. The sum of the measures of the interior angles of ...
*Tuesday, October 14, 2014 at 4:08am*

**Math**

1. The measure of an interior angle of a regular polygon is 20 more than thrice the measure of its adjacent exterior angle. Find the number of sides of the polygon and its total number of diagonals. 2. Find the sum and difference between the sum of the measures of the interior...
*Tuesday, October 14, 2014 at 3:34am*

**math**

Determine whether the fractions in each of the following pairs are equal: a: a^2/b and a^2b/b^2 b: 377/400 and 378/401 c: 0/10 and 0/-10 d: a/b and a+1/b+1, where "a" is not equal to "b" or a =/= b
*Tuesday, October 14, 2014 at 3:06am*

**math**

Yoon Ki drove from Phoenix to tucson in 1 1/2 hours. then she drove from tucson to el paso in 4 3/4 hours. the second part of her trip was how many times as long as the first part.
*Tuesday, October 14, 2014 at 2:16am*

**math**

150 men live in a certain town: 85 are married 70 have a cell phone 75 own a car 55 are married and have a cell phone 35 have a cellphone and a car 40 are married and have car 30 are married, have a car and have a cellphone. How many men are single and do not have a car? How ...
*Tuesday, October 14, 2014 at 12:44am*

**Math**

Write a paragraph proof of this theorem: In a plane, if two lines are perpendicular to the same line, then they are parallel to each other
*Tuesday, October 14, 2014 at 12:36am*

**math**

I need to know how to find a number that makes the statement true so that I can help my daughter. 1/2 < ?/8
*Tuesday, October 14, 2014 at 12:05am*

**math**

compare and contrast: below are two equations. solve each equation and compare the two solutions. choose the statement that is true about each solution. equation #1 2x-3=-17 5x+3=12 A. equation #1 and equation #2 have the same number of solutions B. equation #1 has more ...
*Monday, October 13, 2014 at 11:17pm*

**program planning**

Learning to make candy from a recipe would relate most directly to which two of the 13 activity areas? A. Math and science B. Social studies and science C. Cooking and math D. Social studies and cooking
*Monday, October 13, 2014 at 11:11pm*

**math**

Each time Lucy uses her credit card she earns points from the credit card company. For every 100 dollars she spends she earns 50 points. Choose the equation that accurately represents the relationship between the two variables: m = amount of money spent, and p = total number ...
*Monday, October 13, 2014 at 11:09pm*

**math**

Prove that:(3-4sin^2A) (1-3tan^2A)=(3-tan^2A)(4cos^2A-3)
*Monday, October 13, 2014 at 11:06pm*

**Math**

In a polynomial like 5x^5 + 4x^2 + 2, is 2 counted as a term?
*Monday, October 13, 2014 at 10:38pm*

**Math**

Write a paragraph proof of this theorem: In a plane, if two lines are perpendicular to the same line, then they are parallel to each other.
*Monday, October 13, 2014 at 9:48pm*

**Math**

In a circuit, the voltage, V, is given by the formula V = IZ, where I is the current and Z is the impedance. Both the current and impedance are represented by complex numbers. Find the voltage if current is 3 + 2i and impedance is 4 - i.
*Monday, October 13, 2014 at 9:36pm*

**Math**

luc has 1 h of homework to do. He has assignments to complete for social studies and math, and a science test. he sepends 2/5 of the time completing the social studies assignment, and 1/3 of the time on math. How much time does Luc have left to study for the science test?
*Monday, October 13, 2014 at 9:27pm*

**Math**

According to the 2010 census data , the population of Texas was about 2.5*10^7 people. The land area of Texas is about 2.6*10^5 m^2. Divide the average number of people per square mile in 2010. A. 0.96*10^2 B. 9.6*10^1 C. 0.96*10^35 D. 9.6*10^12 Is the answer A?
*Monday, October 13, 2014 at 9:16pm*

**Math**

Find the Synthetic Division: (10x^4-50x^3-800)/(x-6)
*Monday, October 13, 2014 at 9:16pm*

**math**

Find two positive decimals a and b that make the following statement true. Then find two positive decimals a and b that make the statement false. If a < 1 and b < 1, then a ÷ b < 1.
*Monday, October 13, 2014 at 9:15pm*

**Math**

Which is irrational? A. 0.117117117... B. 0.8596873205... C. 0.812812812812... D. 0.605605605... Is the answer B?
*Monday, October 13, 2014 at 8:58pm*

**math physics**

A meteorite is a solid composed of stone and/or metal material from outer space that passes through the atmosphere and hits the earth’s surface. Find the kinetic energy of a meteorite with mass 250 kg that hits the earth at 25 km/s. Given: m=250kg v=2.5E4m/s <<< ...
*Monday, October 13, 2014 at 8:54pm*

**math physics**

A meteorite is a solid composed of stone and/or metal material from outer space that passes through the atmosphere and hits the earth’s surface. Find the kinetic energy of a meteorite with mass 250 kg that hits the earth at 25 km/s. Given: m=250kg v=2.5E4m/s <<< ...
*Monday, October 13, 2014 at 8:54pm*

**math physics**

A meteorite is a solid composed of stone and/or metal material from outer space that passes through the atmosphere and hits the earth’s surface. Find the kinetic energy of a meteorite with mass 250 kg that hits the earth at 25 km/s. Given: m=250kg v=2.5E4m/s <<< ...
*Monday, October 13, 2014 at 8:54pm*

**Math**

Harold bought two loaves of raisin bread to share with his friends. If there are 12 people total, including Harold, how much bread does each person have? A. 0.06 B. 0.16 THE 6 keeps going on C. 0.25 D. 0.3 And the 3 keeps going on Is the answer C?
*Monday, October 13, 2014 at 8:50pm*

**math**

there are 40 students at Bali high who plays stringed instruments. of these, 1/4 play viola, 1/5 play cello, and the rest play violin. how many students play violin?
*Monday, October 13, 2014 at 8:47pm*

**Math**

One nanometer is about 0.00000003937 of an inch. What is this number in scientific notation? A. 3.937*10^-8 B. 3.937*10^8 C. 39.37*10^-7 D. 39.37*10^7 Is the answer A? Thanks
*Monday, October 13, 2014 at 8:41pm*

**Math. Word problem**

Strawberries are on sale for $2.30 per pound. Noah bought a bag of strawberries for $8.05. How many pounds of strawberries did Noah buy?
*Monday, October 13, 2014 at 8:31pm*

**Math Proof**

Let {X_n} be a sequence of real numbers that is bounded above by M and such that X_n-->x Prove that x<=M
*Monday, October 13, 2014 at 8:30pm*

**Math**

If there is 1/2 if a pizza and Jonas wants only 1/3 of it, how much of the pizza will he eat? A. 1/5 B. 2/5 C. 1/6 D. 2/6 Is the answer B? Thanks
*Monday, October 13, 2014 at 8:27pm*

**Math**

The king's ship sank with 8 gold bars aboard. The king paid captain nemo 4/5 of one bar for finding the gold. The captain gave 1/2 of his gold to charity. What fraction of a bar went to charity?
*Monday, October 13, 2014 at 8:26pm*

**Math**

What is 0.32 written as a fraction in simplest form/ A. 32/100 B. 8/25 C. 100/32 D. 16/25 Is the answer B? Thanks
*Monday, October 13, 2014 at 8:21pm*

**math**

t has been discovered in a certain state that the relationship between the number of snow shovels demanded varies linearly with its price. When the price per item was $ 38 ,2200 items were demanded; When the price was $ 49 , 2125 items were demanded. Determine the price per ...
*Monday, October 13, 2014 at 8:05pm*

**Math**

Divide. Write the answer in simplest form. 8 1/6 divided by 2 1/24. I got 4 5/6 is this right? If so what's the simplest form.
*Monday, October 13, 2014 at 7:56pm*

**Math**

What percent o the student population are girls? Please show work!
*Monday, October 13, 2014 at 7:37pm*

**math**

equivalent expression -3(x-7)
*Monday, October 13, 2014 at 7:26pm*

**math**

total salary is $6650000 per year total gross area it service is 3.5*10000000 squar feet the unit cost, in dollars per square foot,for this group is
*Monday, October 13, 2014 at 7:23pm*

**math**

whats is 0.5l/s=gal/h
*Monday, October 13, 2014 at 7:22pm*

**Math**

Xander says that the place value sections method, the expanded notation method, and the algebraic notation method of multiplying a one-digit number by a two-digit number are pretty much the same. Do you agree or disagree? Explain.
*Monday, October 13, 2014 at 7:06pm*

**math**

The function y_p(t) =ln(4 + 2 t), t > -4/2, is a particular solution to the differential equation y''+8y=g(t). Find g(t).
*Monday, October 13, 2014 at 6:42pm*

**Math**

Where should the decimal be placed in the product of the following problem? (1.632) (0.81)=132192
*Monday, October 13, 2014 at 6:40pm*

**Math**

Find the Synthetic Division: (10x^4-50x^3-800)/(x-6)
*Monday, October 13, 2014 at 6:39pm*

**Math**

The equation -4x+y=0 relates to the number of pages in a photo album y to the number of picture sin the album x. Tell whether the relationship is a direct variation.Explain
*Monday, October 13, 2014 at 6:34pm*

**Math**

Write a real-world context for the following ratio: Five to three
*Monday, October 13, 2014 at 6:33pm*

**math**

7x4-4 devided 2=26
*Monday, October 13, 2014 at 6:26pm*

**Math**

Which is always a correct conclusion about the quantities in the function y=x+4 A. THe variable x is always 4 more than y B. When the value of x is negative the value of y is also negative C.The variable y is always greater than x D.As the value of x increases the value of y ...
*Monday, October 13, 2014 at 6:18pm*

**Math**

merideths heart beats 63 times in 45 seconds how many times will her heart beat in one hour 5040 timwa
*Monday, October 13, 2014 at 6:16pm*

**Math**

How many 1/6 pound hamburgers can be made from 1/2 pound of hamburger meat?
*Monday, October 13, 2014 at 6:15pm*

**Math**

If Mia receives $72.20 for $1,805.00 in sales, how much must her sales be in order to receive $150 in commission
*Monday, October 13, 2014 at 6:13pm*

**Math**

It takes 11 cups of flour to make 3 loaves is bread. What is the ratio of cups of flour to loaves of bread? Write the ratio 3 ways: Word form: Colon form: Fraction form:
*Monday, October 13, 2014 at 6:13pm*

**Math**

6 divided by -3/4
*Monday, October 13, 2014 at 6:10pm*

**Math**

1/3 divided by 2
*Monday, October 13, 2014 at 6:02pm*

**Math**

-2 divided by one half -4?
*Monday, October 13, 2014 at 6:01pm*

**Math**

What is the direct variation function? Is it y/x=k?
*Monday, October 13, 2014 at 5:57pm*

**Math**

3^-2/n and 7ab^-2/3w .
*Monday, October 13, 2014 at 5:57pm*

**Math**

A right pyramid has a surface area of 258 cm2. A right cone has a base radius of 4 cm. The cone and pyramid have equal surface areas. What is the height of the cone to the nearest tenth of a centimetre?
*Monday, October 13, 2014 at 5:57pm*

**math**

average cost for traning is $200 per hour per person 60 person is employs and scheduled for 25hours per year. how much would it cost
*Monday, October 13, 2014 at 5:41pm*

**Math**

If point A is located at (9, -2), which of the following points would be located 9 units away from point A? A. (9,-7) B. (1,-2) C. (9,-11) D. (9,-9) I believe this would be C (9,-11) would I be right? Thanks for the help.
*Monday, October 13, 2014 at 5:34pm*

**math**

the normal work load of the members of an operation, maintenance and repair group is forty hours per week. it employs 75 persons. and each is scheduled for two weeks vacation per year. what is the total amount of time worked by this group in a year?
*Monday, October 13, 2014 at 5:26pm*

**math**

Need help on this problem. The mass of a proton is about 1.7 x 10^-24g. The mass of a neutron is about the same as a proton. The nucleus of an atom of carbon has 6 protons and 6 neutrons. The mass of the nucleus is about 2 x 10^-26 units. what is the best choice for the units ...
*Monday, October 13, 2014 at 5:09pm*

**Math**

6 hundred 2 tens = 5 hundreds ? Tens
*Monday, October 13, 2014 at 5:08pm*

**math**

write a real word problem and equation using t eaqul 5
*Monday, October 13, 2014 at 4:54pm*

**math**

a cell phone company charges $10 per month, for up to 500 text messages, and $.15 for each additional text messages. Stanley was charged $14.50 last month for text messages. Write an equation to find the number of text messages over 500 he sent and received last month
*Monday, October 13, 2014 at 4:45pm*

**math**

1/2X+3=9 solve for x. I'm confused
*Monday, October 13, 2014 at 4:23pm*

**2 STEP MATH EQUATIONS**

eric has a dog walking business. He charges $13per dog he walks and $6 for the water he buys for the dogs. If he made $97 on Monday, write an equation to find the number of dogs he walked on Monday. I got an answer of 7 dogs on Monday. Then, in addition to dog walking, on ...
*Monday, October 13, 2014 at 4:20pm*

**8th Grade Math**

Please help! Which statement is false? A. The number zero is a rational number. B. Some irrational numbers are also rational numbers. C. Every irrational number is a real number. D. Every integer is a rational number. I thinks its D. Please help!
*Monday, October 13, 2014 at 4:03pm*

**math**

You are given a pair of equations, one representing a supply curve and the other representing a demand curve, where p is the unit price for x items. 80 p + x - 380 = 0 and 84 p - x - 40 = 0 a. Identify which is the supply curve and demand curve and the appropriate domain. Put ...
*Monday, October 13, 2014 at 3:54pm*

**Math**

For each object, its surface area, and some dimensions are given. Calculate the dimension indicated by the variable to the nearest tenth of a unit. a) right cone SA=7012mm^2 GIVEN=diameter of 48mm b) right square pyramid SA=65.5m^2 GIVEN=length of 3.5m
*Monday, October 13, 2014 at 3:25pm*

**Math**

An urn contains 3 red, 4 orange, and 6 yellow marbles. 2 marbles are selected without replacement. Find the probability that the second marble selected is orange given that the first marble selected is yellow.
*Monday, October 13, 2014 at 2:35pm*

**Business Math**

Molly Ellen, bookkeeper for Keystone Company, forgot to send in the payroll taxes due on April 15. She sent in the payment on November 8, The IRS sent her a penalty charge of 6.00% simple interest on the unpaid taxes of $1000. Calculate the penalty. (Remember that the ...
*Monday, October 13, 2014 at 1:48pm*

**math**

brenda is planning her birthday party.she wants to have 10.92 liters of punch,6.5 gallons of icecream,3.9 pounds of fudge,and 25 guests at the birthday party
*Monday, October 13, 2014 at 1:41pm*

**Math**

A simplified version of the expression 2sinθ (cos θ)(cotθ) is
*Monday, October 13, 2014 at 12:50pm*

**Math**

Radiation from the Sunkeeps us all alive, but with the thinning of the ozone layer, it is important to limitexposure. The intensity of radiation is inverselyproportional to the square of the distance thatthe Sun’s rays travel.The formula I=k/d^2 models the ...
*Monday, October 13, 2014 at 12:08pm*

**chemistry/math**

5.0 moles of solid sodium chloride (NaCl) are used to prepare a 5.0 M NaCl solution. What is the volume of the solution?
*Monday, October 13, 2014 at 12:06pm*

**Math**

Rewrite the expression 2sinθ(cosθ)(cotθ) in terms of sine or cosine.
*Monday, October 13, 2014 at 11:59am*

**Math**

Starting with the formula mg sin A = umg cos A, you can derive tan A = u to find the angle A of an incline and the coefficient of friction u of objects on the incline.
*Monday, October 13, 2014 at 11:56am*

**Math**

1) An aerobics class is being offered at the ABC body gym. Nonmembers pay $4 per class while member pay a monthly fee of $10 plus $2 per class. a. Create a linear system to represent the two options. b. At how many classes will the cost be the same? What is that cost? c. When ...
*Monday, October 13, 2014 at 11:26am*

**Math**

Alan is using the equation mg sin A = umg cos A to determine the coefficient of friction, u, between a flat rock and a metal ramp. Find u to the nearest hundredth, if the rock begins to slide at 19º.
*Monday, October 13, 2014 at 10:49am*

**math**

a telephone pole is supported by two cables attached to points on the pole 15 ft above ground and to points on the level ground 8 ft from the foot of the pole. what is the total length of the two cables
*Monday, October 13, 2014 at 10:36am*

**Math**

2)Jenny wants to buy a new car, and she has narrowed her choices to two models. Model A sells for $12,500, gets 25mi/gal, and costs $300 a year for insurance Model B sells for $16,100, gets 36 mi/gal, and costs $400 a year for insurance. Jenny drives about 36,000 miles a year...
*Monday, October 13, 2014 at 2:09am*

**Math**

3) While traveling for vacation, you have decided to divide your lodging between a resort, and a regular stay hotel. Let x represent the number of nights you will spend in a resort, and let y represent the number of nights you will spend in a regular stay hotel. a. Write a ...
*Monday, October 13, 2014 at 2:08am*

**College Math**

5) A landscaper wants to make a small planter and surround it with edging material for a client. She is deciding between two designs. Design 1: A square planter Design 2: A circular planter Edging material costs $4 per ft. for the straight variety which she would use for ...
*Monday, October 13, 2014 at 2:08am*

**MATH 101**

Factor: 15x2(2x + 3) + 41x(2x + 3) + 28(2x + 3)
*Monday, October 13, 2014 at 1:56am*

**MATH 101**

Factor: 1200+1640t+280t^2
*Monday, October 13, 2014 at 1:56am*

**math**

a rectangular vegetable bed 10m long and 6m wide is edged on four sides with 2m wide border. find the area of the border
*Monday, October 13, 2014 at 1:38am*

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