Branches of Math
Recent Math Questions
An orchestra buys music stands for $42 each with $298 in its bank account. Write a function rule that shows how the account balance depends on the number of stands bought. What are the initial value and rate of change of the function?
Sunday, January 4, 2015 at 1:18pm
The weekly marginal cost functions C'(x) and the weekly marginal revenue function R'(x) of a company assembling personal computers are given by C'(x) =RM(3x^2-118x+1315) and R'(x)=RM(1000-4x), where x is the number of computers assembled per week. If the fixed ...
Sunday, January 4, 2015 at 12:25pm
Kevin had 3/4 yd of string. He used 1/3 of it on a school project. How much string did he use? A.5/12 yd B.1/3 yd C.7/12 yd D.1/4 yd (numbers are all fractions)
Sunday, January 4, 2015 at 11:59am
Mabel is installing a square pool in her backyard and wants a circular fence to enclose the pool to create 4 grassy areas around the pool as show in the figure. If the pool is located at the coordinates (1, 5), (5, 8), (4, 1), and (8, 4), what is the amount of fencing Mabel ...
Sunday, January 4, 2015 at 6:33am
John was visiting three cities that lie on a coordinate grid at (-4, 5), (4, 5), and (-3, -4). If he visited all the cities and ended up where he started, what is the distance he traveled? Round your answer to the nearest tenth. (like 3.2 or 5.7)
Sunday, January 4, 2015 at 6:31am
Brenda is building a rectangular pen for her dog. She has enough fencing to build the pen so that it has a perimeter of 36 feet. She wants the pen to have an area of 65 ft2. What are the dimensions of the dog pen? A. 5 feet by 13 feet B. 10 feet by 8 feet C. 9 feet by 9 feet D...
Saturday, January 3, 2015 at 11:56pm
Physics, Math, Aerospace, Engineering
A de-orbit burn, similar (but not the same) to that presented in the previous math problem, has been performed. During this de-orbit burn a pre-calculated ∆V (delta V, change in velocity) of 99.1 meters per second will be used to decrease the Shuttles altitude from...
Saturday, January 3, 2015 at 7:22pm
Math - Please help
(Write an equation in slope intercept form of the line that passes through the given point and is parallel to the graph of the equation.) (1, -3); y + 2 = 4(x 1) Please show steps
Saturday, January 3, 2015 at 11:22am
Math Linear Equations
Two lines are drawn on a co-ordinate axis. The equation of the first line is y=-2,and the equation of the other line is y=3x+1. What are the co-ordinates of their intersection point? I have been on this for hours and can't figure out how to do this. Please help. Thank you
Friday, January 2, 2015 at 11:53pm
a scientist theorized that you can estimate the temperature by counting how often crickets chirp. the scientist gathers the data in the table shown. A)how many cricket chirps would you expect to indicate a temperature of 85 degrees? include a graph and an equation as part of ...
Friday, January 2, 2015 at 4:01pm
A newly married couple expected a boy and a girl or four children, occuring boy or girl has equal probability. Find the probability of success of their expectations.
Friday, January 2, 2015 at 11:29am
the sum of two number is 39 . twice the first number plus 3 times the second numberis 101. find the numbers. x+x+1=39 2x=38 x=19 twice the first number 19 it would be 38 and 57 b three times the second number. i know is wrong kind o but please tell me.
Friday, January 2, 2015 at 2:30am
A tractor tire has a diameter of 6 feet and is revolving at a rate of 45 rpm. At t=0, a certain point is at height 0. Write an equation to describe the height of the point above the ground after t seconds. The answer is apparently d=-3cos(3pi/2)t +3 But I thought it's ...
Thursday, January 1, 2015 at 4:16pm
A Ferris wheel makes 3 revolutions per minute. If the diameter is 20 feet, write an equation to describe the height off the ground of a particular seat after t seconds. I got d=10cos(6pi)t as the answer, is this correct?
Thursday, January 1, 2015 at 4:06pm
Reiny ..thanks for the formula and example. I tried it and i get that both sets of triangles are congruent but it is multiple choice with one answer. I dont know what i am doing wrong. How do I determine which two triangles on a graph are congruent. ∆QRS and ∆DEF ...
Thursday, January 1, 2015 at 12:58pm
Tyson handle 250 service calls on his shipped yesterday. Of those, 20% resulted in a successful upsell additional services. You're texting Nexus 6 dollar Commission on top of his regular salary for a successful up so that makes, how much commission did he make yesterday?
Wednesday, December 31, 2014 at 2:17pm
Math- Max and Minimum
Consider the function f(x) = 3/4x^4 x^3 -3x^2 + 6x , find the relative extrema for f(x), be sure to label each as a maximum or minimum. How do I find the x-values of what it is asking?
Wednesday, December 31, 2014 at 1:33pm
If 360 workers called in sick and 240 went to work, how many workers work at the company all together? Solve using fractions and multiplication or division. Obviously the answer is 600 but how do I solve the problem using multiplication or division?
Wednesday, December 31, 2014 at 10:09am
I entered the wrong coordinates in a previous question, i corrected down below. How do I determine which two triangles on a graph are congruent. ∆QRS and ∆DEF or ∆ABC and ∆XYZ. i found the coordinates of both sets: QRS Q(-2,5), R(-2,1), S(-5, 1) DEF D(5...
Wednesday, December 31, 2014 at 9:33am
5th grade Math
Please help, what operation should I use to solve this problem? Jessica bought 10.50 pounds of potatoes. The potatoes are sold in sacks of 20 if the potatoes cost $1.99 per pound. How much money did Jessica spend?
Wednesday, December 31, 2014 at 7:51am
How do I determine which two triangles on a graph are congruent. ∆QRS and ∆DEF or ∆ABC and ∆XYZ. i found the coordinates of both sets: QRS Q(-2,5), R(-2,1), S(-5, 1) DEF D(5,-5), E(5,-2), F(2,-2) or ABC A(4,5), B(6,2), C(2,2) XYZ X(-4,-5), Y(-6,-2), Z(-...
Tuesday, December 30, 2014 at 10:29pm
The requirement for computer server capacity at Acme Industries is expected to increase at a rate of 15% per year for the next 5 years. If the server capacity is expected to be 1,400 gigabytes in 5 years, how many gigabytes of capacity are there today? Round to the nearest ...
Tuesday, December 30, 2014 at 10:01pm
What operation should I use to solve this problem? Jessica bought 10.50 pounds of potatoes, The potatoes are sold in sacks of 20. If the potatoes cost $1.99 per pound how much money did Jessica spend
Tuesday, December 30, 2014 at 8:59pm
The owner of a football team claims that the average attendance at home games is over 3000, and he is therefore justified in moving the team to a city with a larger stadium. Assuming that a hypothesis test of the claim has been conducted and that the conclusion is failure to ...
Tuesday, December 30, 2014 at 12:17pm
A consumer advocacy group claims that the mean amount of juice in a 16 ounce bottled drink is not 16 ounces, as stated by the bottler. Determine the null and alternative hypotheses for the test described. A. H0: µ = 16 ounces Ha: µ < 16 ounces B. H0: µ &...
Tuesday, December 30, 2014 at 12:09pm
A savings account with a current balance of $5,000 earns 2.75% annual interest, compounded continuously. To the nearest dollar, what will be the account balance in 10 years?
Tuesday, December 30, 2014 at 9:50am
∆ABChas vertices A(1, 2), B(4, 4), and C(3, 5). Graph ∆ABC and its image after a reflection over the x-axis. Name the coordinates of the vertices of the reflected triangle...is it A(1,-2), B(3, -4), C(2,-5) or A(-1,2), B(-3,4), C...
Monday, December 29, 2014 at 10:48pm
Research suggests that American students lack a sufficient education in math and science to compete globally. How does the controversy about teaching evolution affect and reflect this problem?
Monday, December 29, 2014 at 6:24pm
The twicedifferentiable function f is defined for all real numbers and satisfies the following conditions: f(0)=3 f′(0)=5 f″(0)=7 a)The function g is given by g(x)=e^ax+f(x) for all real numbers, where a is a constant. Find g ′(0) and g ″(0) in ...
Monday, December 29, 2014 at 2:53pm
Math help, Please
An inverted conical tank (with vertex down) is 14 feet across the top and 24 feet deep. If water is flowing in at a rate of 12 ft3/min, find the rate of change of the depth of the water when the water is 10 feet deep.
Monday, December 29, 2014 at 2:10pm
The edge of a cube was found to have a length of 50 cm with a possible error in measurement of 0.1 cm. Based on the measurement, you determine that the volume is 125,000 cm3. Use tangent line approximation to estimate the percentage error in volume.
Monday, December 29, 2014 at 1:36pm
Is rotating the point L(4,4) 90° ABOUT THE ORIGIN THE SAME AS REFLECTING THE POINT OVER THE X-AXIS? EXPLAIN. I get that the rule is counter clockwise and you rotate x and y and then change the value of the 1st sign.. becomes -y,x but i don't know how to answer the ...
Sunday, December 28, 2014 at 11:34pm
a boy has 380 prize tickets he wants to exchange for action figures at a prize booth,the prize both tickets 5 tickets can be exchanged for a large figure and 7 tickets for 2 small figures the boy wants 4 times as many small action figures as large can the boy get 80 small ...
Sunday, December 28, 2014 at 3:18pm
A uniform rod, AB 2 meters long has a mass of 10 kg and rests with its end A on a rough horizontal ground with coefficient of friction 0.6. The rod is is inclined at 30 degrees to the horizontal and is supported on a rough pin at point C, 1.5 meters from A with coefficient of ...
Saturday, December 27, 2014 at 11:00pm
A floating leaf bobs up and down a total of 8 cm. the leaf completes 3 complete cycles in 8 seconds. (Assume equilibrium at t=0.)Write an equation to model the simple harmonic motion. Can someone explain to me why the answer to this problem is d=4sin(3pi/4)t?
Saturday, December 27, 2014 at 4:59pm
Will Rogers spun a lasso in a vertical cycle. The diameter of the loop was 6 feet, and the loop spun 50 times each minute. If the lowest point on the rope was 6 inches above the ground, write an equation to describe the height of this point above the ground after t seconds. ...
Saturday, December 27, 2014 at 4:57pm
Station Math Two station astronauts will each perform two 8-hour EVAs within 13 days to repair a damaged solar panel that was impacted by a micrometeoroid on the space station. What is the total amount of oxygen needed by the two astronauts to accomplish this? Please put your ...
Saturday, December 27, 2014 at 1:52am
A music stores stock of music includes new releasesand top ten hots on the ratio of 3:5. How many top ten hits are tthere in a shipment of 80???? What I did 3:5 *16:*16 48:80 Is it right or not plz tell. I am having so much difficult I in this one
Saturday, December 27, 2014 at 1:39am
You buy a television for $550. That price included a 10% sales tax. what is the price without sales tax? The answer choices are A)$500 B)$605 C)$55 D)$550 I did a proportion to find this answer by doing: 10/100=x/550 ;and I ended up getting $495, which is not one of the ...
Friday, December 26, 2014 at 10:07pm
Write an equation with phase shift 0 to represent simple harmonic motion with initial position -1/2, amplitude 1/2, and period 4. I got d=(1/2) sin (pi/2) t + (1/2). Is this correct?
Friday, December 26, 2014 at 7:16pm
An electrician charges a $50 fee to make a service call plus $25 per hour he works. Determine whether the relationship between the two variables is proportional. Hours Cost($) 1 75 2 100 3 125 4 150 Is this proportional? Because i am not sure. When i plot these points on a ...
Friday, December 26, 2014 at 6:56pm
A music stores stock of music includes new releases and top ten hits in the ratio of 3:5. How many top hits are there was n a shipment of 80. What I did,,................... 3:5 #16:*16 48:80
Friday, December 26, 2014 at 5:47pm
the bookstore normally sells mechanical pencils for $6.50. this week the pencils are discounted by 25%. to the nearest cent, what is the amount of the discount?
Friday, December 26, 2014 at 4:52pm
suppose a 24 acre plot of land is being divided into 1/3 acre lots for a housing development project. what is the greatest number of lots possible in the development? so do you solve by dividing 24 and 1/3?
Friday, December 26, 2014 at 4:38pm
the area of an equilateral triangle is given by the expression s^2 x square root of 3/4, where s is the side length of the triangle. what is the area of the triangle? round to the nearest tenth the triangle is 5 cm on all three sides.
Friday, December 26, 2014 at 4:22pm
the french club is hosting a breakfast each monday morning in the cafeteria. The breakfast menu is shown in the table. crepes-2 dollars croissants-3 dollars danish- 5 dollars juice- 1 dollar write an algebraic expression that can be used to find a customer's total cost ...
Friday, December 26, 2014 at 4:15pm
overnight the low temperature dropped to -6 degrees Fahrenheit. If the high temperature during the day was 11 degrees Fahrenheit, what was the difference between the high and low temperatures? Please help, thank you so much!
Friday, December 26, 2014 at 4:05pm
the distance from the sun to earth is about 1.5x10^11 meters. suppose light travels at a speed of 3x10^8 meters per second. About how long does it take light from the sun to reach earth? PLEASE HELP!!!
Friday, December 26, 2014 at 3:51pm
It's been several years since I have had to do math and I am posed with this ? and don't recall how to find the answers. There is a fixed overhead of $1 per bolt. They make a run of 10,000 bolts at a total marginal cost of $70k. They sell them all, and lose $20k. What ...
Friday, December 26, 2014 at 3:19pm
A wire 360 cm long is cut into two pieces. One piece is formed into a square and the other into a circle. If the two figures have the same area, what are the lengths of the two pieces of wire (to the nearest tenth of an centimeter)? Take the length of the circle to be x cm.
Friday, December 26, 2014 at 1:54pm
A bag contains 33 balls: 10 blue 11 red and 12 green If a person will select balls at random from the bag without replacement, what is the minimum number of balls needed to be selected in order to be sure that the balls selected include 3 balls of the same color
Friday, December 26, 2014 at 3:58am