Monday

October 20, 2014

October 20, 2014

**Branches of Math**

**Recent Math Questions**

Post a New Question | Current Questions

**Math**

The circumference of a sphere was measured to be 74.000 cm with a possible error of 0.50000 cm. Use linear approximation to estimate the maximum error in the calculated surface area. Estimate the relative error in the calculated surface area. Must be accurate to the fifth ...
*Sunday, October 5, 2014 at 8:56pm*

**Math**

What is the linear approximation of the square root of 8.9? Must be accurate to the fifth decimal place. I have tried entering 2.98328 and 2.98328 but that does not appear to be correct. Please help!!
*Sunday, October 5, 2014 at 8:50pm*

**Math**

A street light is at the top of a 17 ft tall pole. A woman 6 ft tall walks away from the pole with a speed of 8 ft/sec along a straight path. How fast is the tip of her shadow moving when she is 30 ft from the base of the pole? Must be accurate to fifth decimal place. I have ...
*Sunday, October 5, 2014 at 8:47pm*

**Math**

The bookseller sells packages of 15 pens each and 12 pencils each.they want the same number of pens and pencils in their next order.find the smallest number of packages
*Sunday, October 5, 2014 at 8:38pm*

**math**

there are 32 boys and 24 girls. what re the various number of teams that can be made that would have the same number of boys and girls on each team?
*Sunday, October 5, 2014 at 8:37pm*

**Math**

What is the linear approximation of the square root of 8.9? Must be accurate to the fifth decimal place. I have tried entering 2.98328 but that does not appear to be correct.
*Sunday, October 5, 2014 at 8:34pm*

**Math**

A conical water tank with vertex down has a radius of 10 feet at the top and is 22 feet high. If water flows into the tank at a rate of 30 {\rm ft}^3{\rm /min}, how fast is the depth of the water increasing when the water is 14 feet deep? I have tried several times but keep ...
*Sunday, October 5, 2014 at 8:13pm*

**Math**

What is the linear approximation of the square root of 8.9? Must be accurate to the fifth decimal place. I have tried everything it seems like yet cannot get the right answer.
*Sunday, October 5, 2014 at 8:10pm*

**Math**

A spherical balloon is to be deflated so that its radius decreases at a constant rate of 12 cm/min. At what rate must air be removed when the radius is 5 cm? Must be accurate to the 5th decimal place. I keep getting -3769.91118. What am I doing wrong? Please help!
*Sunday, October 5, 2014 at 8:08pm*

**Math**

Water is leaking out of an inverted conical tank at a rate of 0.0109 {\rm m}^3{\rm /min}. At the same time water is being pumped into the tank at a constant rate. The tank has height 9 meters and the diameter at the top is 4.5 meters. If the water level is rising at a rate of ...
*Sunday, October 5, 2014 at 8:06pm*

**Math Check**

Hi! Can someone check this and see if they are correct? Thanks! 1.) Which value of x should the expression be further simplified? √(21)x a.) 5 B.) 6 c.) 11 D. 55 My answer: a 2.) 2√43x is show: Which value of x makes the expression equivalent to 14√43? a.) 7 ...
*Sunday, October 5, 2014 at 7:55pm*

**Math**

A conical water tank with vertex down has a radius of 10 feet at the top and is 22 feet high. If water flows into the tank at a rate of 30 {\rm ft}^3{\rm /min}, how fast is the depth of the water increasing when the water is 14 feet deep? I have tried several times but ...
*Sunday, October 5, 2014 at 7:47pm*

**Math**

A spherical balloon is to be deflated so that its radius decreases at a constant rate of 12 cm/min. At what rate must air be removed when the radius is 5 cm? Must be accurate to the 5th decimal place. It seems like an easy question but no matter how many times i attempt it I ...
*Sunday, October 5, 2014 at 7:43pm*

**Math**

A sixth grader weighs 90 pounds which is 120% of what he weighed in 4 th grade. How much did he weigh in 4th grade? 90x100=9000/120= 75 So he weighed 75lbs is this correct?
*Sunday, October 5, 2014 at 7:17pm*

**Math**

Water is leaking out of an inverted conical tank at a rate of 0.0109 {\rm m}^3{\rm /min}. At the same time water is being pumped into the tank at a constant rate. The tank has height 9 meters and the diameter at the top is 4.5 meters. If the water level is rising at a rate of ...
*Sunday, October 5, 2014 at 7:13pm*

**Math**

In a parking lot 16% of the cars are blue. There are 4 blue cars in the lot. How many cars are not blue? 4x100=400\16= 25 then minus 4 blue cars to get the answer that 21 of the cars are not blue. I know the answer is 21 I'm just not sure if the work is correct?
*Sunday, October 5, 2014 at 7:06pm*

**Math**

If the side of a square is doubled in size to 8", by what percent did it's area increase?
*Sunday, October 5, 2014 at 7:00pm*

**Math Gr 12**

Using proper notation, describe the end behaviour of y = 1 -------- + 3 X-2
*Sunday, October 5, 2014 at 6:53pm*

**Math**

A 5" by 7" picture is enlarged to 8" x 10". By what percent did it's area increase?
*Sunday, October 5, 2014 at 6:40pm*

**Math**

A uniform bar 1.100 metres in length and having a cross sectional area of 19.500cm square is subject to a loading of 5050.000 newtons. This load causes an extension to the bar length of 2.610mm.Calculate the stress and strain produced
*Sunday, October 5, 2014 at 5:42pm*

**Math**

Solving long division polynomials 5x-6/10x^2-7x-6
*Sunday, October 5, 2014 at 4:57pm*

**math**

At noon, ship A is 20 nautical miles due west of ship B. Ship A is sailing west at 24 knots and ship B is sailing north at 25 knots. How fast (in knots) is the distance between the ships changing at 5 PM? I have tried multiple times but keep getting confused.
*Sunday, October 5, 2014 at 4:56pm*

**probability;math**

A card is chosen at random from a deck of 52 cards It is then replaced and then a second card is chosen.What is the probability of choosing a jack and then an eight?
*Sunday, October 5, 2014 at 4:49pm*

**math**

The equation of line l is 3x-4y=24. the line intersects the x -axis at A and the y -axis at B. GIVEN THAT M is the point (4,-3) and O is the origin . find the length of AB .
*Sunday, October 5, 2014 at 3:43pm*

**Math **

Lyle is putting his videotapes on a shelf.the shelf is 12 inches long.if each videotape is 1 1/2 inches wide,how many videotapes can he put side by side on the shelf?
*Sunday, October 5, 2014 at 3:20pm*

**Math**

4X^2+4y^2-8X-20y+13=0
*Sunday, October 5, 2014 at 2:55pm*

**Math**

How would you solve this function algebraically. f(x)=-5v-4x+4+2?
*Sunday, October 5, 2014 at 2:37pm*

**math**

If I borrowed $15000 in April 2008 at 6% interest and have paid $150 per month since then, how much have I paid and how much do I owe?
*Sunday, October 5, 2014 at 2:18pm*

**math**

2t + 8 greater than or equal to -4(t + 1)
*Sunday, October 5, 2014 at 1:46pm*

**math**

In mathematics class, 30 students received an A on the third test, which is 125% of the students who received an A on the second test. How many students received an A on the second test?
*Sunday, October 5, 2014 at 1:43pm*

**Math**

Julie is conducting an experiment where she placed 29.5 mL of water in a calorimeter at 15.0 °C. Then, 2.4 g of A (molar mass = 48.0 g/mol), also at 15.0°C, is added to the water in the calorimeter and the temperature of the solution increases to 28.0 °C. The ...
*Sunday, October 5, 2014 at 1:26pm*

**math problem**

the school cafeteria serves pizza every sixth day and applesauce every eighth day. suppose that pizza and applesauce are both on today's menu. In how many days will they be together on the menu again?
*Sunday, October 5, 2014 at 12:43pm*

**math**

a painter earns $15 per hour. what is the minimum number of hours he must work to earn at least $200? write an inequality to represent this situation and solve.
*Sunday, October 5, 2014 at 12:06pm*

**math**

A medical researcher believes that the standard deviation of the temperatures of newborn infants is greater than 0.6 degrees. A sample of 15 infants was found to have a standard deviation of 0.8 degrees. At the 0.10 level of significance, does the evidence support the ...
*Sunday, October 5, 2014 at 10:50am*

**Math**

1.) Which of the following inequalities is true for all real values of x? a.) x^3≥^2 b.) 4x^2≥2x^2 c.) (3x)^2≥4x^2 d.) 2(x-3)^2≥2x^2-3 2.) Which following inequalities is true for all real values of x? a.) x^5≥x^4 b.) 5x^2≥2x^3 c.) (5x)^2&#...
*Sunday, October 5, 2014 at 9:24am*

**Math**

20. Find the product of 987.2365 and 1,000. A. .9872365 B. .09872365 C. 987,236.5 D. 9,872,365 Ohh now I see it is C
*Saturday, October 4, 2014 at 10:02pm*

**Math**

A 5x7 photo fits in a frame with a 2 1/4 inch boarder. What is the perimeter of the entire shape
*Saturday, October 4, 2014 at 9:56pm*

**math**

A person purchased a $204,815 home 10 years ago by paying 10% down and signing a 30-year mortgage at 10.2% compounded monthly. Interest rates have dropped and the owner wants to refinance the unpaid balance by signing a new 30-year mortgage at 5.1% compounded monthly. How much...
*Saturday, October 4, 2014 at 9:41pm*

**Math**

How do you solve the equation by completing the square X^2+4x=10
*Saturday, October 4, 2014 at 9:11pm*

**Math**

a truck can be rented from company A for $100 a day plus $0.60 per mile and company B charges $50 a day plus $0.80 per mile to rent the same truck. Find the number of miles in a day at which the rental costs for company A and B are the same.
*Saturday, October 4, 2014 at 8:16pm*

**Math**

6. If 31/2 pounds of bananas cost $.98, how much would one pound cost? A. $.20 B. $.14 C. $.28 D. $.18 C? 7. A used car is priced at $2,695. If you borrow the money for the car, your payments will be $122 a month for 30 months. How much will you save by paying cash? A. $965 B...
*Saturday, October 4, 2014 at 7:33pm*

**1333 math **

Probability Scores 0.2 0 0.2 2 0.05 4 0.45 7 0.1 9 Find the variance of the above random variable random variable.
*Saturday, October 4, 2014 at 7:19pm*

**math**

A jar contains 8 pennies, 3 nickels and 4 dimes. A child selects 2 coins at random without replacement from the jar. Let X represent the amount in cents of the selected coins. Find the expected value of X.
*Saturday, October 4, 2014 at 7:14pm*

**Math**

A regulation baseball bat must be 2/3/4 inches or less in diameter and shorter than 42 inches long. Which bat would not be allowed? a)diameter 6cm b) length 0.9m c)diameter 7m d)length 1.0668m d?
*Saturday, October 4, 2014 at 6:43pm*

**math**

Solve 2s^3-4r^2 if r=1 and s=5 I did 2*5*5*5=250 4*1*1=4 250-4=246 I also added 2*5^3-4*1^2=246 Am I correct? Thanks
*Saturday, October 4, 2014 at 6:36pm*

**Math**

Convert 86 inches to yards, feet, and inches? Why the inches again?
*Saturday, October 4, 2014 at 6:30pm*

**Math**

Scarlet-Camille needs three lengths of wood to finish a project. She needs one piece measuring 148 cm, one piece measuring 38 cm, and one piece measuring 42 cm. Every time Scarlet-Camille cuts a length of wood she loses 3 mm of wood. If Scarlet-Camille can only purchase lumber...
*Saturday, October 4, 2014 at 5:56pm*

**math**

Lester jogs 5 3/4 miles on each day that he jogs. Last month, he jogged a total of 115 miles. How many days did he jog last month?
*Saturday, October 4, 2014 at 5:50pm*

**Math**

1. A strip of wood 78 inches long is to be cut into pieces 3 3/4 inches long. How many pieces can be cut? A. 12 B. 26 C. 20 D. 21 C?
*Saturday, October 4, 2014 at 5:44pm*

**math evaluation **

So how am I suppose to Evaluate the expression and put it in simplest form? It's 7th grade math. The question I need help on is: -8/3 + 1/4. If u comment and show me how u got an anwser THANKS!!!!!
*Saturday, October 4, 2014 at 5:00pm*

**math**

a hall charges $30 per person for a sports banquet when 200 people attend. for every 10 extra people that attend, the hall will decrease the price by $1.50 per person. what number of people will maximize the revenue for the hall?
*Saturday, October 4, 2014 at 3:53pm*

**Math**

19. Paul can type 60 words per minute and Jennifer can type 80 words per minute. How does Paul's typing speed compare to Jennifer's? A. Paul can type 1/3 as fast as Jennifer. B. Paul can type 3/4 as fast as Jennifer. C. Paul can type 11/3 times as fast as Jennifer. D...
*Saturday, October 4, 2014 at 3:45pm*

**math**

If evies chicken lays 4 eggs in 5 days how many days will it take for evies chicken to 16 eggs?
*Saturday, October 4, 2014 at 2:39pm*

**Math**

2. Lavina wants to buy a rocking chair for $160. She will pay 10% down and pay the rest in six monthly installments. What will be the amount of each monthly payment? A. $27 B. $16 C. $24 D. $26 C?
*Saturday, October 4, 2014 at 2:15pm*

**Combinatorics (math)**

In a certain country, 40 roads lead out of each city. When all roads are open, it is possible to travel from any city to any other. Each road leads from one city to another; there are no dead end roads. If one road is closed for repairs, is it still necessarily possible to ...
*Saturday, October 4, 2014 at 12:51pm*

**Math**

-80=8b-15+5b How do I solve this and what does check mean?
*Saturday, October 4, 2014 at 12:45pm*

**Math Help**

Find the inverse of the following function algebraically. Show all work. f(x)=-5√-4x+4+2
*Saturday, October 4, 2014 at 10:28am*

**Math**

1.) An expression is show: √21x; for which value of x should the expression be further simplified? a.) 5 b.) 8 c.) 37 d.) 54 2.) An expression is show: √42x; for which value of x should the expression be further simplified? a.) 11 b.) 13 c.) 20 d.) 55
*Saturday, October 4, 2014 at 10:04am*

**Math**

What is (-7)^5 in expanded form? A. -7x-7x-7x-7x-7 B. -7.5 C. (-7)x7x(-7)x7x-7 D. 5x5x5x5x5x5x5 Is the answer A? Thanks
*Saturday, October 4, 2014 at 2:49am*

**math**

Sue needs 2/1/3 cups of flour for a batch of cookies. How many complete batches can she make with 10 cups if flour? A. 5 batches B. 3 batches C. 2 batches D. 4 batches D? Thanks
*Saturday, October 4, 2014 at 2:31am*

**math**

a 1000 seat multiplex is divided into 3 theatres. there are 310 seats in theatre A.theatre C has 180 seats then theatre B. how many seats are there in theatre b?
*Saturday, October 4, 2014 at 1:08am*

**Math**

Find the number of the sides of a regular polygon, if the measure of one of its exterior angle is between 28 and 32.
*Friday, October 3, 2014 at 11:10pm*

**Math**

If the measure of an interior angle of a regular polygon is 165, find the sum of the measures of its interior angles
*Friday, October 3, 2014 at 11:09pm*

**Math**

The sum of the measures of four of the angles of a heptagon is 520. Two of the remaining three angles are congruent. The other remaining angle is 3/2 the measure of one of the two congruent angles. Find the measures of the remaining angles.
*Friday, October 3, 2014 at 11:09pm*

**math**

Charles Sherwood(1838-1883) was an entertainer.In 1863 hermarried Lavinia Warren, who like himself was a dwarf. George W. Morrison, was the best man at the wedding. Use the following clues to find the height in inches of Charles Sherwood, his wife Lavinia and George Morrison. ...
*Friday, October 3, 2014 at 10:21pm*

**Math**

Pat and Kelly went hiking in the mountains. They started at 9,100 ft. They climbed 1,200 ft the first day, descended 900 ft the second day, and climbed 1,000 ft the third day. On the fourth day they descended 800 ft. What was the average altitude at which they hiked?
*Friday, October 3, 2014 at 10:21pm*

**math**

an average adult flea can jump 200 times the lenght of its own body. An adult flea is about 0.1 inch long. About how many feet can the average adult flea jump?If you were able to jump 200 times your height, about how many yards would you be able to jump?
*Friday, October 3, 2014 at 10:12pm*

**math**

8h x $9/h i really need help. i do not understand. Please help, Thank You in advance My work 8/h x 9/h= 72/h i dont know what to do next
*Friday, October 3, 2014 at 10:05pm*

**math**

Suppose there is a 2 degree drop in the temp for every thousand feet that an airplane climbs into the sky if the temp on the ground, which is at sea level is 64 degrees What would be the temp
*Friday, October 3, 2014 at 9:48pm*

**Math**

Rectangle ABCD has been subdivided into 4 regions. The areas of two of these regions are a^2 and 144. The combined area of the other two regions is 25a. What is the perimeter of the rectangle ABCD? Please help and show steps! I don't have a clue how to do this. Thank you ...
*Friday, October 3, 2014 at 8:50pm*

**math**

The number 57,733 contains two sets of digits in such digit is ten times as great as the other.What are the values of the digits in each set.
*Friday, October 3, 2014 at 8:42pm*

**MATH - 2ND GRADE**

Sonya has 140 beads. How many bags of 10 beads does she need so that she will have 200 beads in all?
*Friday, October 3, 2014 at 8:14pm*

**Math**

Kate is 5 years older than Lenny. Lenny is 2 years younger than Maria. Maria is twice as old as Norman. If Norman is 10 years old, how old is katie?
*Friday, October 3, 2014 at 8:11pm*

**Math**

16. If a sports shop sold 1,500 dozen golf balls last week, how many individual golf balls did the shop sell? A. 180 B. 125 C. 12,500 D. 18,000 D? 20. How many yards are in 7 miles? A. 12,320 B. 700 C. 36,960 D. 252 A?
*Friday, October 3, 2014 at 8:09pm*

**math**

if 2 chickens can lay 8 eggs in 3 days, how many eggs can 5 chickens lay in 6 days?
*Friday, October 3, 2014 at 8:08pm*

**Math**

1. Victor brought a brand new car for 750,000. IF the value of the car depreciates 20% per year, what will it be worth during the fourth year? 2. Given the terms a10 = 3/512 and a15 = 3/16384 of a geometric sequence, find the exact value of the first term of the sequence.
*Friday, October 3, 2014 at 8:04pm*

**2ND GRADE MATH**

A store sells 2 boxes of 100 pencils and some single pencils. Choose all the numbers that show how many pencils the store could sell: 1. 219, 2. 206, 3. 120, 4. 182
*Friday, October 3, 2014 at 7:46pm*

**one last difference (math)**

This time, it's decimals that i need help with. - What fraction less than 1.8 is 1.2?
*Friday, October 3, 2014 at 7:43pm*

**5th grade math**

What percent more than 2 is 16/5? Help me please
*Friday, October 3, 2014 at 7:40pm*

**math**

Shannon invests $3,000, at 8% interest, compounded quarterly for one year. Use Table 11-1 to calculate the effective interest rate for her investment. (Round the effective rate to the nearest hundredth percent.)
*Friday, October 3, 2014 at 7:28pm*

**math 156**

A company will need $35000 in 6 years for a new addition. To meet this goal the company deposits money in an account today that pays 4% annual interest compounded quarterly. Find the amount that should be invested to total $35000 in 6 years. The company should invest $□?
*Friday, October 3, 2014 at 7:19pm*

**math**

Use Gauss's approach to find the following sums ( do not use formulas). A. 1+2+3+4+...1001 B. 1+3+5+7...+99.
*Friday, October 3, 2014 at 6:57pm*

**math**

(x + 2y)^2 simplified
*Friday, October 3, 2014 at 6:23pm*

**Math **

8. The gross weight of a package and its contents is 11 pounds 5 ounces. If the packaging weighs 1 pound 15 ounces, what is the net weight of the contents? A. 12 lb. 20 oz. B. 10 lb. 5 oz. C. 9 lb. 6 oz. D. 10 lb. 6 oz. D or B?
*Friday, October 3, 2014 at 5:56pm*

**Math**

A 21-foot ladder is leaning against a building. The base of the ladder is 7 feet from the base of the building. To the nearest degree, what is the measure of the angle that the ladder makes with the ground? (Hint: Sketch the problem before solving.)
*Friday, October 3, 2014 at 5:25pm*

**Math Growth Rate w/ inflation**

In a country where inflation is a concern, prices have risen by 50 % over a 3-year period. (a) By what percent B do the prices rise each year? Find the time t it takes for prices to rise by 8% Enter your answers to two decimal places. b = ____ % t = _______ years (b) ...
*Friday, October 3, 2014 at 4:44pm*

**Math**

She jogged 3.647 miles one day and 3.003 miles the next. How much further did she jog the first day the the second day? Round answer to the nearest tenth of a mile.
*Friday, October 3, 2014 at 4:33pm*

**Math (Confused, no idea where to begin)**

The voltage V across a charged capacitor is given by V(t) = 2e^-0.16t volts, where t is in seconds (A) what is the voltage V(5) after 5 seconds? Find the time t when the voltage will be 1 volt Enter your answers to two decimal places V(5) approximately ___________ volts t ...
*Friday, October 3, 2014 at 4:20pm*

**Math**

A roofer must set up a 40-foot ladder against the side of a house. He sets the ladder so that the distance from the base of the ladder to the wall is 1/5 of the length of the ladder. To the nearest degree, what acute angle does the ladder make with the ground? (Hint: Sketch ...
*Friday, October 3, 2014 at 4:07pm*

**Math Calculous**

Q = 16.8*10^-0.22t Give the starting value a, the growth rate r, and the continuous growth rate k. Exact answer for a, Round the answer for r and k to two decimal places a = 16.8 r = 10 k = -22% Can someone check my answer? I do not think the values for r and K are correct. I ...
*Friday, October 3, 2014 at 3:43pm*

**math algebra**

Decide whether the equation has one solution, no solution or infinitely amount of solutions. 1: 2(x - 3) = 2x one none infinitely 2: 3(y - 3) = 2y - 9 +y one none infinitely 3: 10x - 2 - 6x = 3x - 2 + x one none infinitely 4(x + 3) + 2x= x - 8 one none infinitely
*Friday, October 3, 2014 at 2:59pm*

**Math**

For the function h(x) = 2cot(x/2) an expression for the value of all asymptotes is ________?
*Friday, October 3, 2014 at 2:35pm*

**Math Questions**

1.) 6√24x, for which value of x makes the expression equivalent to 18√24? a.) 3 b.) 9 c.) 12 d.) 18 My answer: C. 2.) 4√72x, for which value of x makes the expression equivalent to 24√72? a.) 6 b.) 7 c.) 36 d.) 72 My answer: A. 3.) 7√32x, for ...
*Friday, October 3, 2014 at 12:22pm*

**Math**

2. If a thermometer indicates 40 degrees Celsius, what is the temperature in degrees Fahrenheit? A. 72°F B. 54°F C. 104°F D. 22°F C?
*Friday, October 3, 2014 at 12:18pm*

**Math**

The rotating light on a lighthouse is 400 feet from a cliff. It completes one rotation every 10 seconds. The equation representing the distance, d, in feet that the center of the circle of light is from the lighthouse is d(t) = 400sec (πt/5). What is the period of d(t)? (...
*Friday, October 3, 2014 at 11:51am*

**math **

Suppose the length of time cats sleep each day is normally distributed with a mean of 15 hours and a standard deviation of 2 hours. Which groups describe 34% of the cat population? I just need help on how to do it.
*Friday, October 3, 2014 at 11:34am*

**Math**

A cylinder has a surface area of 250cm2 . The height is twice as big as the radius. What is the height of the cylinder?
*Friday, October 3, 2014 at 11:14am*

**Math**

Can someone tell me if I have this right? Thanks! Question: P varies directly as Q can be written as P = kQ. True Or False. My answer: True
*Friday, October 3, 2014 at 10:59am*

**Math**

A boy spends 32% of his money and has $120 left how much did he have at first
*Friday, October 3, 2014 at 9:58am*

**math**

i am a number between 5 and 10. my decimal is in tenths. the sum of my digits is 10. what number could i be?
*Friday, October 3, 2014 at 8:44am*

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