115 Answered Questions for the topic Mathmatics

Mathmatics

04/11/16

After graphing and identifying the parent function for the above situation, use the graph to estimate how many hours it would take Stacy to earn $60. _____ h
 i need help sovilng this problem for math 
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Mathmatics Math

04/05/16

The radius of a circle is increasing at a rate of 3 ft/min. At what rate is its area changing when the radius is 4 ft? (Recall that for a circle, A = pr2.)
The radius of a circle is increasing at a rate of 3 ft/min. At what rate is its area changing when the radius is 4 ft? (Recall that for a circle, A = πr2.)
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Mathmatics

03/19/16

please help me in this hard question
let c = (0 to π ) ∫ e^(-2x) * cos x dx and s = (0 to π ) ∫ e^(-2x) * sin x dx a) show by integration by parts , or otherwise that c = 2s and s=-2c+1+e^(-2π) b) hence, or otherwise find the values... more
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Mathmatics

03/04/16

Can someone answer this?
It took 8 painters 6 hours to paint a gym. How long would it take 12 painters? How many person-hours does this job require? 
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11/17/15

Find a 90% confidence interval for the population average startup costs µ for candy store franchises
Do you want to own your own candy store? Wow! With some interest in running your own business and a decent credit rating, you can probably get a bank loan on startup costs for franchises such as... more
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11/17/15

Compute 95% and 99% confidence intervals for µ using Method 1 with a Student's t distribution!
When σ is unknown and the sample is of size n ≥ 30, there are two methods for computing confidence intervals for μ. Method 1: Use the Student's t distribution with d.f. = n − 1. This is the... more
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11/17/15

A farm brings 15 tons of watermelon to market. Find a 90% confidence interval for the population mean cash value of this crop. What is the margin of error? Hint
What price do farmers get for their watermelon crops? In the third week of July, a random sample of 38 farming regions gave a sample mean of x = $6.88 per 100 pounds of watermelon. Assume that σ is... more
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11/13/15

In the following problem, check that it is appropriate to use the normal approximation to the binomial. Then use the normal distribution to estimate the request
It is estimated that 3.2% of the general population will live past their 90th birthday. In a graduating class of 737 high school seniors, find the following probabilities. (Round your answers to... more
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Mathmatics Math Word Problem

09/30/15

what is the standard form?
the number is four million, two hundred sixteen thousand, ninety?
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Mathmatics

09/27/15

a party of hikers stops for a rest 101 meters below the rim.then they descend another 52 meters.what is their new altitude
The surface ,or rim ,of a canyon is at an altitude of58 meters.on a hike down into the the canyon;a party of hikers stops for a fest 101 meters below the rim?then they descend 52 meters. what is... more
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06/24/15

Find the value of k such that the system of linear equations is inconsistent.
Find the value of k such that the system of linear equations is inconsistent.6x + 2y = 8−9x + ky = −11   k=?
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06/24/15

Word problem, Math, Matrix unit
"In a football game, Team A defeated Team B by a score of 28 to 10. The total points scored came from a combination of touchdowns, extra-point kicks, and field goals, worth 6, 1, and 3 points,... more
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06/23/15

Physics: mechanical advantage? (multiple choice)
What is the mechanical advantage of a claw foot hammer having a handle with a length of 45 cm and head length of 10 cm? a. 1/9 b. 2/9 c. 2/5 d. 5/2 e. 9/2 f. 9/1
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Mathmatics Math Physics Mass

06/23/15

Physics: Angular velocity (multiple choice)
At a dilapidated playground, people have stolen the support bar to a merry-go-round leaving a flat disk that can rotate freely. While pondering conservation of angular momentum, a curious physics... more
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Mathmatics Math Physics Velocity

06/19/15

Physics: Bernoulli’s principle with pressure and velocity (multiple choice)
Driving slowly down a two-lane highway a large transport truck passes me going the same way as I am. As he does physics flashes before my eyes, and I think Bernoulli’s principle with pressure and... more
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Mathmatics Math Physics Mass

06/19/15

Physics: Conceptual Question (angular momentum)
At a dilapidated playground, people have stolen the support bar to a merry-go-round leaving a flat disk that can rotate freely. While pondering conservation of angular momentum, a curious physics... more
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Mathmatics Math Physics Velocity

06/18/15

Physics: multiple choice (Density and buoyancy)
In considering density and buoyancy, a helium balloon floats in air even as wood floats on water. A father was bringing home balloons for a party and had attached the balloons to the seat of a van... more
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Mathmatics Math Physics Time

06/18/15

Physics: What is the tangential velocity, and how many revolutions?
The new blade on my table saw has a radius of 15.0 cm. My table saw has a maximum speed of 3750 rpm. If it takes 2.50 seconds to get up to this final speed, what is the tangential velocity of the... more
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Mathmatics Math Physics Time

06/18/15

Physics: What is her momentum of Inertia?
A figure skater can increase her angular velocity from a speed of 2.00 revolutions in 3.00 seconds to 5.00 revolutions in 2.00 seconds by bringing her arms in. If her moment of inertia was 4.60 kg... more
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Mathmatics Math Physics Mass

06/18/15

Physics: What is the density of the unknown liquid?
A 85.0 g bottle is filled half full with 1.00 L of water. It is filled the rest of the way will an unknown liquid. The total mass of this full bottle is 1.75 kg, what is the density of the unknown... more
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Mathmatics Math Physics Mass

06/18/15

Physics: How many 15.0 gram metal army men could you safely float on a piece of wood
A typical piece of wood has a density of 750 kg/m3. How many 15.0 gram metal army men (or Barbies - your preference) could you safely float on one such piece of wood having a mass of 1.25 kg, in a... more
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04/21/15

What must you score in the 2nd exam to get an overall 40% in the module.
There are 2 exams in one module. One exam is worth 30% the other is worth 70% of the overall grade.You score 60% in the exam worth 30%.What must you score in the 2nd exam to get an overall 40% in... more
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Mathmatics

04/01/15

Solve the following system of equations using the substitution method.
x=y+6 4x+y=14     The solutions is___.(Type an order pair.)
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10/02/14

A student gets paid to deliver newspaper after school. She earns $25 a day, plus an extra $0.75 for each newspaper
A student gets paid to deliver newspaper after school. She earns $25 a day, plus an extra $0.75 for each newspaper she delivers and $5 for each new customer she signs up for delivery. If d=days,... more
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Mathmatics Math Inequalities Graphs

09/29/14

The parabola is a graph of the equation y = (x-1)^2 - 3 which point will satisfy the inequality
The parabola is a graph of the equation y = (x-1)^2 - 3 which point will satisfy the inequality y<(x-1)^2 - 3?   A.) (1,0) B.) (5,3) C.) (2,5) D.) (0,5)
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