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August 1, 2014

August 1, 2014

**Branches of Math**

**Recent Math Questions**

Post a New Question | Current Questions

**math**

Determine the concavity in the graph of f (x) = -4x^3 + 8x^2 + ax + b, where a and b are real numbers. Answer downward on (-∞, ∞) downward on (-∞, 2/3); upward on (2/3, ∞) upward on (-∞, -2/3); downward on (-2/3, ∞) upward on (-∞, 2/3...
*Wednesday, May 28, 2014 at 2:38pm*

**math**

In a zoo, 21% of the animals are reptiles and 11% are birds. There are a total of 1,500 animals in the zoo. Which proportion can be solved for r, the number of reptiles in the zoo?
*Wednesday, May 28, 2014 at 2:26pm*

**math**

Suppose f(x) = x^3 on the interval [1, 4]. Use the Mean Value Theorem to find all values c in the open interval (1, 4) such that f'(c)= (f(4)-f(1))/4-1 c= square root of 7 c= cubed root of 21 c = 7 Mean Value Theorem does not apply
*Wednesday, May 28, 2014 at 2:24pm*

**math**

The simple formula for the nth term of an arithmetic sequence is an = 6n + 14. What is the explicit formula corresponding to the simple formula?
*Wednesday, May 28, 2014 at 2:10pm*

**Math**

At your summer with a research company, you must get a random sample of people from your town to answer a question about spending habits. Which of the following Methods is most likely to be random? a)You survey customers at the local shopping mall b)You survey people chosen ...
*Wednesday, May 28, 2014 at 11:50am*

**math**

Nathan bought 8 wooden posts to build a fence. The length of each post is 6 feet 4 inches. What is the total length in inches of the 8 posts? A. 608 B. 576 C. 166 D. 76
*Wednesday, May 28, 2014 at 11:08am*

**Math (Pre-calc)**

I need to know how to solve this for my review questions. Thanks! The wheel on a racing bike have a radius of 14 in. How fast is the cyclist traveling in mph if the wheels are turning at 280 revolutions per minute. find the exact value of the expression. Sin(2pi/3)+ tan(3pi/4)
*Wednesday, May 28, 2014 at 9:29am*

**Math**

(1/25)-3/2 please solve this q
*Wednesday, May 28, 2014 at 5:38am*

**math**

A 1.6 km road rises 400 m. What is the angle of elevation of the road to the nearest degree?
*Wednesday, May 28, 2014 at 1:15am*

**math**

Tyson handled 150 service calls on his shift yesterday. Of those, 20% resulted in a successful upsell of additional services. If Tyson makes a $6 commission on top of his regular salary for each successful upsell that he makes, how much commission did he make yesterday?
*Wednesday, May 28, 2014 at 12:44am*

**math**

Denise took a total of 80 calls on her shift at work today. Of those 80 calls, 55% were resolved, 15% escalated to a supervisor, and 10% required that a technician be sent out to the customer's house. What is the total number of calls that Denise resolved on her shift today?
*Wednesday, May 28, 2014 at 12:38am*

**math help plzzz!!!!!!!!!**

-8<1-3(x-2)<13
*Wednesday, May 28, 2014 at 12:02am*

**math help plzzz**

Solve the inequality then graph the solution set on real number line. (2/5x)>7 2(x+7)-4>5(x-3)
*Tuesday, May 27, 2014 at 11:56pm*

**math**

length of blanket is 80 inches and width is 60 inches,how long the border has to be to go around the edge of the blanket?
*Tuesday, May 27, 2014 at 11:25pm*

**7th grade math**

Solve the inequality then graph the solution set on real number line. (2/5x)>7 2(x+7)-4>5(x-3)
*Tuesday, May 27, 2014 at 11:23pm*

**math problem**

In DABC, what could the 7 shown in the ratio sin A = 7/9 represent? A) the length of the adjacent side of angle B B) the length of the opposite side of angle A C) the length of the hypotenuse of a right triangle D) the length of the adjacent side of angle A I did this as an ...
*Tuesday, May 27, 2014 at 11:23pm*

**HeLP MATH !!!!**

The annual sales S (in billion of dollars) of oracle corporation from 2004 through 2009 can approximated by linear equation S=2.903t-1.98, 4 < t < 9, where t represent the year,with t=4 corresponding to 2004.use the model estimate the year in which oracles annual sales ...
*Tuesday, May 27, 2014 at 11:07pm*

**math**

A ladder is leaning against the side of a house and forms an angle of 66o with the ground. The foot of the ladder is 11.3 feet from the base of the house. Find the length of the ladder to the nearest foot.
*Tuesday, May 27, 2014 at 11:03pm*

**Math**

How to expand, then evaluate, and simplify this log question: logbase7 (49( 3sqrt x^5)) I put the brackets in myself, I there were originally no brackets nor spaces in the question
*Tuesday, May 27, 2014 at 10:41pm*

**math**

there are 4 boys at the park. some boys join them. now their 16 kids at park. how many boys joined them?
*Tuesday, May 27, 2014 at 10:11pm*

**math**

a man standing on ground level is 1000 feet away from the base of a 350 feet tall building. Find,to the nearest degree,the measure of the angle of elevation to the top of the building from the point on the ground where the man is standing? How do you solve for this measurement...
*Tuesday, May 27, 2014 at 10:10pm*

**6th grade math**

Determine whether each value of x is a solution of the inequality 4x-5<3 a. x=0 b. x=2 c. x=-2 d. x=4 Help please *show the work and answer!!
*Tuesday, May 27, 2014 at 9:35pm*

**math**

How to make a 10 grams ....anything. ...please help me Please tell me how to make
*Tuesday, May 27, 2014 at 9:31pm*

**math**

write an equation of the line containing the given point and parallel to the given line (2,-5);3x-4y=9
*Tuesday, May 27, 2014 at 9:10pm*

**math**

mike is playing cars with his sister when he draws a card from a pack of 35 cars number from 1 to 35. what is the probability of drawing number that is divisible by 5?
*Tuesday, May 27, 2014 at 8:56pm*

**Math**

How to expand, then evaluate, and simplify this log question: logbase7 (49( 3sqrt x^5)) I put the brackets in myself, I there were originally no brackets nor spaces in the question
*Tuesday, May 27, 2014 at 6:42pm*

**math**

what other shapes can form with 24 metres
*Tuesday, May 27, 2014 at 6:27pm*

**math**

How many rectangles can you make with 24 metres
*Tuesday, May 27, 2014 at 6:26pm*

** Math? Check Answers Please!!**

1. x^16/x^3 x^16/3 x^48 x^19 x^13** 2. 4^4 • 4^6 4^2 4^6** 4^10 4^24 3. 4^4 • 4^44 4^176 4^48 4^40** 4^28 4. 3^4/3^4 Write the value of the expression. 3 0 1 4** 5. 3^3/3^6 1/27** 1/9 9 -27
*Tuesday, May 27, 2014 at 5:43pm*

**Math Homework: Check Answers**

1. Suppose you earned 8t - 3 dollars on Monday and 6t + 5 dollars on Tuesday. What were you total earnings? Simplify your answer. A) 2t + 2 B) 2t - 8 C) 14t + 2 D) 14t - 8 Answer: A 2. f^2 • f^4 A) (2f)^8 B) (2f)^6 C) f^8 D) f^6 Answer: D 3. 100^12/100^8 A) 100^12/8 B) ...
*Tuesday, May 27, 2014 at 5:20pm*

**math**

Find the total surface area of the right cylinder. H= 12 and r = 7
*Tuesday, May 27, 2014 at 4:48pm*

**Math**

The surface area of the sphere is 20.25pie square centimeters. What is the diameter of the sphere?
*Tuesday, May 27, 2014 at 4:42pm*

**MATH PLZ**

you accept a new job with a starting salary of $34,800. You are told you will receive an annual raise of least $1,500. What is the maximum number of years you must work before your annual salary will be 45,000? (** SHOW WORK SO I CAN KNOW HOW YOU GOT THE ANSWER....)
*Tuesday, May 27, 2014 at 3:32pm*

**math**

A commonly accepted angle of elevation for safe, accessible wheelchair ramps is 4:5 degrees. The public library's main door is 1:2 m above street level. What will be the run of this ramp?
*Tuesday, May 27, 2014 at 3:07pm*

**math**

The slope of a ramp leading into a grocery store is 1:6. What is the angle of elevation of the ramp?
*Tuesday, May 27, 2014 at 3:04pm*

**math**

A ladder on the west coast trail on Vancouver island BC, has a slope of 16 over a run of 3 m. What is the Verticle distance covered by the ladder?
*Tuesday, May 27, 2014 at 3:01pm*

**math**

y=a-x solve for x
*Tuesday, May 27, 2014 at 2:43pm*

**math**

Where K is a constant to be determined. If it took Ian 45 minutes to exit the stadium when there were 5,000 people who drove and 1,500 people who took public transportation, how much time will it take Ian to exit if there are 12,500 people who drove and 4,00 who took public ...
*Tuesday, May 27, 2014 at 2:32pm*

**math**

Where K is a constant to be determined. If it took Ian 45 minutes to exit the stadium when there were 5,000 people who drove and 1,500 people who took public transportation, how much time will it take Ian to exit if there are 12,500 people who drove and 4,00 who took public ...
*Tuesday, May 27, 2014 at 2:31pm*

**7th grade Math (polynomials)**

How do you write a polynomial in standard form? Ex. 1.1x-8.5x^3
*Tuesday, May 27, 2014 at 2:08pm*

**math**

Write the number of permutations in factorial form. Then simplify. J K L M N O P 7! 720 8! 40,320 7! 49 7! 5,040 I think it is d.
*Tuesday, May 27, 2014 at 1:50pm*

**math**

factorize :x2-2X+xy-2y
*Tuesday, May 27, 2014 at 10:47am*

**7 grade math**

Consider two types of nonlinear equations. What unique quality does each possess and how does that quality cause the graph's unique shape? Name two unique examples of these shapes in real-world situations.
*Tuesday, May 27, 2014 at 8:29am*

**Math**

Find the derivative of the following function: (x^2)^sinx.
*Tuesday, May 27, 2014 at 6:32am*

**Math**

Q1. A population has a mean of µ = 80 with σ = 20. a. If a single score is randomly selected from this population, how much distance, on average, should you find between the score and the population mean? 20 because the standard deviation is 20 b. If a sample of n...
*Tuesday, May 27, 2014 at 6:17am*

**math**

A solid sphere of radius Xcm is placed in a cylinder of radius 2Xcm and height 2Xcm. The cylinder is then filled with water to the brim and the solid gently withdrawn. Find d volume of d water in d cylinder in cm3
*Tuesday, May 27, 2014 at 5:19am*

**math**

Aislyn decides to research attendance at sporting events for her project. She finds data on average attendance per game at San Diego Chargers (CA) football games and at Dallas Cowboy (TX) football games. The table shows the average attendance for each team for the 2000 season ...
*Tuesday, May 27, 2014 at 1:24am*

**math**

2 1/10* 2 1/7=
*Monday, May 26, 2014 at 11:59pm*

**math**

54. The volume of certain rectangular solid is 12x. If the dimensions of the solid are the integers x,y,and z,what is the greratest possible value of z? a. 36 b. 24 c. 12 d. 6 e. 4 please answer and explain
*Monday, May 26, 2014 at 10:38pm*

**math**

When x is divided by 3,the remainder is z.In terms of z, which of the following could be equal to x ? a. z-3 b. 3-z c. 3z d. 6+z e. 9+2z please answer and explain
*Monday, May 26, 2014 at 10:35pm*

**Math**

These two box and whisker plots show the results of a science test. Plot 1: Minimum:65, Maximum:95, Median:82, 1st Quartile:67, 3rd Quartile:88 Plot 2: Minimum:57, Maximum:100, Median:92, 1st Quartile:78, 3rd Quartile:93 What does this information tell you about the results? A...
*Monday, May 26, 2014 at 10:20pm*

**Math**

There are 30 seniors, 15 juniors, 12 freshman, and 10 sophomores in the club. When one student is picked randomly, what is the probability that a sophomore is not chosen? 57/67?
*Monday, May 26, 2014 at 9:19pm*

**math**

The question is there are 18 students in a class. Each day the teacher randomly selects three students to assist in a game: a leader, a recorder, and a timekeeper. In how many possible ways can the jobs be assigned? so first is 1 out of 18 then since one was picked, now it is ...
*Monday, May 26, 2014 at 9:09pm*

**Math**

The probability of rolling a number less than 4 on a number cube is ____ 1/2?
*Monday, May 26, 2014 at 8:56pm*

**Math**

The underside of a bridge has a shape of a parabolic arch. It has a maximum height of 30m and a width of 50m. Can a sailboat with a mast of 28m above the water pass under the bridge 8m from the middle of the bridge?
*Monday, May 26, 2014 at 8:38pm*

**Math**

A 10m by 20m pool is to be surrounded by a deck of uniform width. The area of the deck is twice the area of the pool, what is the width of the deck?
*Monday, May 26, 2014 at 8:36pm*

**Math**

At a park, a landscaper wishes to plant a uniform border of tulips around the outside of a 18m by 12m rectangular garden. The garden will look best if the area of the tulip border is half the area of the garden. How wide should the border be?
*Monday, May 26, 2014 at 8:34pm*

**Math**

A model rocket is launched from a roof of a building. Its path is described by the relationship h=-5t*2+35t+10, where h is the height in metres and t is the time in seconds. How tall is the building? What is the maximum height that the rocket will reach? When will the rocket ...
*Monday, May 26, 2014 at 8:32pm*

**Math**

The altitude of a triangle is 2cm longer than its base. The area of the triangle is 60 cm*2. What are the dimensions of the triangle?
*Monday, May 26, 2014 at 8:30pm*

**Math**

The path of a basketball foul shot is modelled by the relation h=-0.44d*2+4.4d+7, where h is the height in feet and d is the horizontal distance in feet. At what height is the ball released? What was the maximum height the ball reached? The centre of the basket is 14 feet away...
*Monday, May 26, 2014 at 8:25pm*

**Math**

A rectangle garden measures 15m by 24m. A larger garden is to be made by increasing each side by the same amount. The resulting area is to be 1.5 times the original area. Find the dimensions of the new garden to the nearest tenth of a metre.
*Monday, May 26, 2014 at 8:22pm*

**math**

A rectangle has a perimeter of 23cm. Its area is 33 cm*2. Determine the dimensions of the rectangle.
*Monday, May 26, 2014 at 8:18pm*

**math**

Given: R=(1,2,3,4,) A=(0,2,4,6) P=(1,3,5,7) What is R U P U= the symbol actually is an upside down U. We didn't learn this symbol so I do not know what to do. Can you help? answer choices are: 1) (0,1,2,3,4,5,6,7) 2) (1,2,3,4,5,7) 3) (1,3) 4) (2,4) Thank you for helping ...
*Monday, May 26, 2014 at 8:05pm*

**math**

rachel drove 260 miles using 12 gallons of gas. at this rate, how many gallons of gas would she need to drive 286 miles?
*Monday, May 26, 2014 at 7:27pm*

**Math, grade 10**

Two whole numbers add to 17 and the sum of their squares is 185. What are the numbers
*Monday, May 26, 2014 at 5:29pm*

**Math, grade 10**

Two numbers add to 18. If you square the larger number and add 6 times the smaller number you get 163. What are the numbers. Solve with quadratic equation?
*Monday, May 26, 2014 at 5:04pm*

**math**

The slope of a bike is 1,9 and rises 4 feet. What is the horizontal distance covered by this jump?
*Monday, May 26, 2014 at 4:26pm*

**math**

A wheelchair ramp rises 5 feet over a horizontal distance of 15 feet. What is the slope of this ramp?
*Monday, May 26, 2014 at 4:25pm*

**math**

solve the inequality -5(x-7)<15 algebraically for x -5(x-7)<15 -5x+35<15 -35 -35 -5x,-25 -5 -5 divide both sides by -5 x=5 is this correct? Thanks for checking my work.
*Monday, May 26, 2014 at 4:03pm*

**math**

Oatmeal is packed in a cylindrical container The diameter of the container is 13cm and its height is 24 cm. Determine in terms of TT (pi), the volume of the cylinder, in cubic centimeters v=TTr^2h v=TT6.5^2(24) v=1014 TT(pi) Is this correct? Thanks for checking my work
*Monday, May 26, 2014 at 3:56pm*

**math**

what would the graph of y=x^2+1 look like A. a straight line B. a parabola C. a dotted line D. none of the above
*Monday, May 26, 2014 at 12:19pm*

**math**

Mrs. Sue please help! A true-false test has 12 questions. What is the probability of guessing the correct answers to all of the questions? (1 point) 1 over 4096 1 over 144 one over twenty four 1over14
*Monday, May 26, 2014 at 11:50am*

**Math**

Mrs. Sue please help me! 7. A bag contains 7 green marbles, 9 red marbles, 10 orange marbles, 5 brown marbles, and 10 blue marbles. You choose a marble, replace it, and choose again. What is P(red, then blue)? (1 point) seventy-seven over one hundred sixty-four nineteen over ...
*Monday, May 26, 2014 at 11:27am*

**Math**

If a vehicle travels 1320 feet in seven seconds from a dead stop , how long does it take for that same vehicle to travel 1313 feet from a dead stop ?
*Monday, May 26, 2014 at 10:37am*

**business math**

Posted by bibi on Sunday, May 25, 2014 at 6:42pm. I need help can someone Help please. Thank everyone. I really appreciated. Break-even Analysis. the R from selling x units of a product is R=139.95x the Cost C of producing units is C=97X+850. In order to obtain a profit, the ...
*Monday, May 26, 2014 at 9:57am*

**math**

if i an 100' from a tree and the angle to the top is 24 degrees how tall is the tree
*Monday, May 26, 2014 at 9:37am*

**math**

what is the rule if input is 23 and output is 56
*Monday, May 26, 2014 at 7:06am*

**geometry math help**

"the inside of a carton is measured and is found to be width of 40cm, length 60cm and depth 30 cm. it is to be packed 2 layers deep with cylindrical tins that have a radius of 5cm and height of 15cm (outside measurements)." a) show that 48 tins can be packed into the...
*Monday, May 26, 2014 at 4:06am*

**math**

How much money I saved if I follow this number pattern 5,10,15,?20?30
*Monday, May 26, 2014 at 3:36am*

**math**

If a number increases from 2,000 to 2,610 what is the rate of increase?
*Monday, May 26, 2014 at 12:43am*

**math**

what is the slope of the line represented by the equation 4x+3y=12 1) 4/3 2) 3/4 3) -3/4 4)-4/3 I did 4x+3y=12 -4x -4x 3y=-4x+12 /3 /3 divide each side by3 y=-4/3x+4 so I got answer 4 because the -4/3 is the slope Is this correct? Thanks for checking my work
*Sunday, May 25, 2014 at 10:21pm*

**math**

the question is what is the solution of the equation x+2/2=4/x? 1) 1 and-8 2)2 and-4 3) -1 and9 4) -2 and4 I did x^2+2x+8 (x+4)(x+2) -4 -2 This is not one of the choices can you help me figure out where I went wrong. Thanks for your help
*Sunday, May 25, 2014 at 9:46pm*

**Math - Personal Finance**

Ina is negotiating a mortgage of $145 000 for her new house. Determine Ina's monthly payments for a mortgage at 5% annum, compounded semi-annually, amortized over 25 years. How much will Ina pay over the 25 years to pay off this mortgage?
*Sunday, May 25, 2014 at 9:29pm*

**math**

The Washington Monument is 169 meters high. Find the angle of elevation to the nearest degree to the top of the monumenmt from a point .5 km from the base.
*Sunday, May 25, 2014 at 8:49pm*

**math**

Draw a rectangle to show that 5(x+2) and 5x + 10 are equivalent.
*Sunday, May 25, 2014 at 6:55pm*

**business math**

Break-even Analysis. the R from selling x units of a product is R=139.95x the Cost C of producing units is C=97X+850. In order to obtain a profit, the revenue must be greater than the cost. A)complete the table x 10 20 30 40 50 60 R C B) for what values of x will this product ...
*Sunday, May 25, 2014 at 6:42pm*

**business math**

the annual sales S (in billion of dollars) of oracle corporation from 2004 through 2009 can be approximated by the linear equation S= 2.903t-1.98, 4 is less than proximally T less than proximally 9, where t represents the year, with t=. use the model to 4 corresponding to 2004...
*Sunday, May 25, 2014 at 6:31pm*

**business math**

Salary Increase.you accept a new job with a starting salary of 34,800. you are told that you will receive an annual raise of at least 1,500. what is the maximum number of years you must work before your annual salary will 45,000
*Sunday, May 25, 2014 at 6:04pm*

**math**

write each product using an exponent. then find the value: 7 to the 4th power
*Sunday, May 25, 2014 at 4:25pm*

**need help1 what function to use? math**

An airplane approaches a runway at a 3 degree angle of depresssion. If the plane is flying at 30,000 ft., find the ground distance from the airport to the point directly below the plane when the pilot begins the descent. Round your answer to the nearest foot.
*Sunday, May 25, 2014 at 4:06pm*

**math**

write an integer to represent each piece of data: Jan earned 7 dollars interest in her savings account last month.
*Sunday, May 25, 2014 at 3:57pm*

**math**

2n + m n = 1/2 m = 2/5
*Sunday, May 25, 2014 at 3:23pm*

**math**

An object is thrown or fired straight upwards at an initial speed of v_0 ft⁄s will reach height h feet after t seconds, where h and t are related to the formula h=-16t^2-v_0 t Suppose the object is fired straight upwards with an initial speed of 800ft⁄s, What is ...
*Sunday, May 25, 2014 at 3:09pm*

**math question**

How do i solve this? If it helps i think its B. from how i did it but i dont think i worked it out right X/4 + 1= -6 A.2 B.-4 C.-22 D.-28
*Sunday, May 25, 2014 at 2:40pm*

**math**

Evaluate for each expression m = 2/5 and n = 1/2 1) 2m + n 2) 2m - n Please explain so I can understand the rest of the questions.
*Sunday, May 25, 2014 at 2:38pm*

**Business Math**

Ace Formalwear buys tuxedos from a supplier and has an invoice amount of $27,700. The terms of the sale are 3/20, n/30. If Ace sends a partial payment of $7,400 on the discount date, what is the net amount still due?
*Sunday, May 25, 2014 at 2:36pm*

**Math**

Helping grandson with math. I would like to know how to do it before he does. "How many different rectangles can be made with a perimeter of 20 units? (Remember, a square is also a rectangle.)"
*Sunday, May 25, 2014 at 1:05pm*

**Math functions help**

given f(x) = 1-2x, and g(x) = x^2+1, find: a) g(-2) ---- i get 5 ? b) f(x+1) c) g`f(x) --- there is like a degree symbol circle between g and f.. d) f^-1(x)
*Sunday, May 25, 2014 at 9:02am*

**quadratics math**

the height of a triangle is 4cm shorter than its base. if the triangle has an area of 48cm2, find the length of the base of the triangle.
*Sunday, May 25, 2014 at 8:27am*

**logarithm math help**

express: In(√x / y^2z ) thanks :)
*Sunday, May 25, 2014 at 8:15am*

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