Monday
December 22, 2014

Posts by jane


Total # Posts: 1,402

Algebra
The profit, y, be selling x pretzels is found by the formula y = -0.002x^2 + 1.6x -350. Find the number of pretzels that must be sold to maximize profit.
December 12, 2011

calculus
Let f be the function given by f(x)= x^2+4x-8. The tangent line to the graph at x=2 is used to approximate values of f. For what value(s) of x is the tangent line approximation twice that of f?
December 11, 2011

calculus
Thanks, that's the answer I get.
December 9, 2011

calculus
The width of a rectangle is measured as 12.3 cm, while the length is measured as 28.8 cm. The width measurement could be off by 1.2 cm, and the length could be off by .04 cm. Estimate the maximum possible error in calculating the area of the rectangle.
December 9, 2011

calculus
thanks!
December 8, 2011

calculus
Find the volume that remains after a hole of radius 1 is bored through the center of a solid sphere of radius 2.
December 8, 2011

calculus
thanks, that's pretty close to what I got
December 8, 2011

calculus
W=6x^4 * SQRT4y * ln * (3z) Yes, the derivative of W with respect to x
December 8, 2011

calculus
W=6x^4 SQRT4y ln (3z) find F with regards to x Is 24x^3 SQRT4y ln (3z) correct?
December 8, 2011

health and safety
1 tablespoon p.58
December 6, 2011

Calculus
Find the partial derivative for x. f(x,y)=1/SQRTx^2+y^2
December 1, 2011

physics
Running at 2.0 m/s a 45.0 kg person collides with a 90.0 kg person who is traveling at 7.0 m/s in the other direction. Upon collision, the 90 kg person continues to travel forward at 1.0 m/s. How fast is the 45 kg person knocked backwards?
November 29, 2011

Calculus
same thing I got, but not even close to any of the answer choices ... 2.69, 16.69, -2.15, and 1.51. This one has me stumped!!
November 27, 2011

Calculus
Use integration by parts to find the integral. Round the answer to two decimal places if necessary. (x+4) ln x dx between 3 and 0. I tried this problem two different ways and got two different answers 1.63 and 3.89. which one is correct? Please.
November 27, 2011

chemistry
Calculate the molarity of a 295 mL solution contain 45 g of ethanol (C2H5OH)
November 27, 2011

Calculus
so my answer would be 3/2 (3e^4+1)/ (e^2-1)?
November 26, 2011

Calculus
(1/e^2-1)(6x^2 lnx/2-x^2/4) am I on the right track?
November 26, 2011

Calculus
Find the average value of the function on the given interval. f(x)=6x lnx; [1,e^2]
November 26, 2011

Calculus
thanks for your answer, there was typo on the question ... but I figured out the answer using excel spreadsheet for Simpson's rule.
November 25, 2011

Calculus
Use your calculator to approximate the integral using the method indicated, with n=100. Round your answer to four decimal places. sqrt(x+4)^dx between 4 and 0.
November 25, 2011

Chemistry
Write the molecular equation, the complete ionic equation, and the net ionic equation for the reaction of barium hydroxide with sodium nitrate.
November 23, 2011

Chemistry
How many milliliters of a 3.85 M solution of Fe2+ are needed to titrate 250.0 mL of a 0.125 M Cro4 2- solution? H + CrO4 2- + Fe2+ yields to Fe3+ + Cr2O3 + H2) (not balanced)
November 23, 2011

Chemistry
What is the mass, in grams, of NaCl formed from the reaction of 2.75 mL of a 6.00 M Na2SO4 solution and 8.30 mL of 2.5 M solution of HCl?
November 23, 2011

Calculus
that's what I was thinking, the teacher must have made a mistake on this question ... no one I ask can help me with it.
November 23, 2011

Calculus
Use integration by parts to find the integral. Round the answer to two decimal places if necessary. (x+4)^ln x dx between 3 and 0
November 23, 2011

Math
Please show me how to solve: Hannah took a survey of 500 students at her school to find out whether they liked baseball or football. The results are shown in the Venn diagram. How many of the students surveyed like football? 28% liked baseball, 32% liked both, 16% liked ...
November 21, 2011

science-important!
What was the correct answer?
November 19, 2011

math
Steve, Is there a way to find out how many liked football only. How do you separate the "both" number to find football only?
November 19, 2011

math
How many of the students surveyed liked football?
November 19, 2011

math
Please show me how to solve: Hannah took a survey of 500 students at her school to find out whether they liked baseball or football. The results are shown in the Venn diagram. How many of the students surveyed like football? 28% liked baseball, 32% liked both, 16% liked ...
November 19, 2011

math
Please show me how to work this problem: Fran makes a rectangular tablecloth that has an area of 5 ft squared. Her mother makes a tablecloth that is three times the length and three times the width of Fran's. What is the area, in square feet, of her mother's tablecloth?
November 19, 2011

Math
Two farmers use combines to harvest corn from their fields. One farmer has 600 acres of corn, and the other has 1000 acres of corn. Each former's combine can harvest 100 acres per day. Write two equations for the number of acres y of corn not harvested after x days. Are ...
November 19, 2011

math
Please show me how to solve: For what value of k are the graphs of 12y = -3x + 8 and 6y =kx - 5 parallel? For what value of k are they perpendicular?
November 17, 2011

algebra
I do not know how to do this problem, please help. (35b^3 + 25b^2 + 30b + 44)divided by (5b + 5)
November 14, 2011

algebra
Please I do not know how to figure this out: Identify the degree of each term of the polynormial and the degree of the polynormial of -4x^3 + 2x^2 + 7x + 1 degree of the first term, second, third, fourth terms and the polynomial
November 13, 2011

algebra
Again I have no clue in figuring out this problem, please help: (3s^4-3s^3+3s^2+13s-6) + (s^5+8s^3+6s^2-3s+3) + (-6s^4+s^2-7s-6)=
November 13, 2011

algebra
Again I have no clue in figuring out this problem, please help: (3s^4-3s^3+3s^2+13s-6) + (s^5+8s^3+6s^2-3s+3) + (-6s^4+s^2-7s-6)=
November 12, 2011

algebra
Please I do not know how to figure this out: Identify the degree of each term of the polynormial and the degree of the polynormial of -4x^3 + 2x^2 + 7x + 1 degree of the first term, second, third, fourth terms and the polynomial
November 12, 2011

algebra
Please help: Multiply and simplify: (5sqrt:5 - 10sqrt:3)(2sqrt:5 + 4sqrt:3)
November 12, 2011

algebra
Help: Divide: (35b^3+ 25b^2 + 30b +44) divided by (5b + 5)
November 12, 2011

algebra
Please I need help: Find the vertex, the line of symmerty and the maximum or minmum value of the quadratic function: f(x)= 2x^2+2x+3
November 11, 2011

math
What is the slope of a line that is parallel to y=2? What is the slope of a line that is perpendicular to y=2? Is it "0"?
November 11, 2011

math
Write an equation that has a slope of -2/3 in Point-slope form and Slope-intercept form.
November 10, 2011

algebra
Please help: If the sides of a square are lingthened by 7cm, the area becomes 169cm^2. Fine thelength of a side of the orginal square.
November 10, 2011

algebra
Need help. please help: Solve and simplify, use comma to separate answers: sqrt:9x+55=x+5
November 10, 2011

algebra
Add and simplify 4y/y^2-9 + y/y-3
November 10, 2011

algebra
I do npot understand how to do this problem, please help: 4y/y^2-y/y-3
November 10, 2011

algebra
Please I need help! Solve and simplify: x^2+14x-4=0
November 10, 2011

Math
Describe how to draw a line that passes through the origin and has a slope of 3/5.
November 9, 2011

college math excursions
what is the next number sequence for 0,10,24,56,112,190
November 8, 2011

physics
6600 N
November 7, 2011

english
Can somebody help me restate my thesis please. statement for the conclusion. My thesis is: An analysis of the literary devices in Katy Perry " Fireworks" and Miley Cyrus " The Climb" reveals Miley Cyrus creates a better argument for how every person is an ...
November 3, 2011

math
F(x) = /x-2/ (absolute value) Please show me to to graph this equation.
November 1, 2011

math
for F(x) = /x-2/ (absolute value) When you graph this problem, does it have a straight line or a "v" line?
November 1, 2011

chemistry
Hi everyone, Why are metals more reactive in acids? Thanks
October 29, 2011

natural disaster
if volcanos and earthquakes, why do people choose to live in the area where it occurs the most?
October 28, 2011

data management
1) show that a) 2(2n-1 C n-1) = (2n Cn) b) n(2n C n) = (n+1)(2n C n+1)
October 28, 2011

english
is " but I will not allow anyone to succeed hanging clouds over me" a metaphor or paradox or is it something else? is "there's a light in me, that shines brightly" a metaphor? " Iwill rise steadily sailing out of their reach" a paradox? if im ...
October 28, 2011

english
can somebody tell where the poetic devices are located in the song cant take that away by mariah carey? such as metaphor, mood paradox etc. Mmmmh Whoaaa They can say, Anything they want to say, Try to bring me down, But I will not allow anyone to succeed hanging clouds over me...
October 28, 2011

data management
1) solve: a) (2n+1C2) = (nC2)sqaured b) 12(nC2) = n!
October 28, 2011

Data management
1)SOLVE: a) 2nP3 = 2(nP4) b)6(n+1P2) = 3nP2 2) If (nC12 = (nC8), find (nC17) and (22Cn) 3)simplify. a) n(squared) (n-2)! - n(n-2)! / n! b) (nC2) - (nCn-2) 4)If nPr - 506 and (nCr_ = 253, find n and r. 5) If (28C2r)/(24C2r-4) = 225/11, find r.
October 27, 2011

College Math
Make 300 mL of a 0.4M NaOH solution.
October 27, 2011

College Chemisrty
There are 140 g of H2SO4 in 400 mL of a solution. What is the molarity?
October 27, 2011

Data management
1) consider the number of grid paths from the orgin in a coordinate graph to each of the following points: a) (4,7) b) (3,7) c) (4,6) 2) simplify: (n-r)! / (n-r+1)! 3) solve (n+2)!/ (n-1)! = 210
October 27, 2011

math
Suppose your business has a special checking account used just for paying the phone bill. The balance is $1040.00 this month. Next month the balance will be $995.80, after that it will be $951.60, and on the third month the balance will be $907.40. Write a rule to represent ...
October 27, 2011

math
a function is (always, never or sometimes) a relation.
October 27, 2011

Data management
1) In how many ways can 12 distinct objects be seperated into three equal piles? 2) In how many ways can 25 students be assigned to 4 distinguishable study groups if at least 6 students must be in each group? 3) in how many ways can 4 students be assigned to 9 class periods if...
October 27, 2011

Math
Lloyd makes an hourly wage of $9.50 per hour. Every 6 months he receives a $0.50 per hour raise. Write a rule that describes his raise and determine how much he will be paid after 4 years.
October 27, 2011

math
You budget $100 each month for parking. Each day you use the downtown parking lot. It costs $5. Write a rule to represent the amount of money left in the monthly budget as a arithmetic sequence. How much money is left in you budget after you have used the downtown parking lot ...
October 25, 2011

math
You start an investment account with $3000 and save $100 each month. Write a rule to represent the total amount of money you invest in the account as an arithmetic sequence. How much money will you have invested after 12 months?
October 25, 2011

arithmetic
The initial term of an arithmetic sequence is 5. The eleventh term is 125. what is the common difference of the arithmetic sequence?
October 25, 2011

Statistics
1. Consider a population with µ=73.6 and 0 = 5.38 (A) Calculate the z-score for x =72.7 from a sample of size 45. (B) Could this z-score be used in calculating probabilities using Table 3 in Appendix B of the text? Why or why not?
October 25, 2011

math
you want to take an 8-ft.wide piece of plywood through a 36-inch-wide door. What is the minimum possible height for the door to allow youto fit the plywood?
October 24, 2011

math
two cars leave the same point at noon. one car travels north and the other car travels east. suppose the northbound car is traveling 40mph, and after two hours, the two car are 100 miles apart.how fast is the other car going?
October 24, 2011

math
two cars leave the same point at noon. one car travels north and the other car travels east. suppose the northbound car is traveling 40mph, and after two hours, the two car are 100 miles apart.how fast is the other car going?
October 24, 2011

Statistics
Consider a population with µ=73.6 and 0 = 5.38 (A) Calculate the z-score for x =72.7 from a sample of size 45. (B) Could this z-score be used in calculating probabilities using Table 3 in Appendix B of the text? Why or why not?
October 24, 2011

math
hello ya im helping my son homework.regarding estimation to get reasonable range. Three classes collected aluminum cans for recycling .one class collected 42 cans,another collected 56 cans,and the third class collected 64 cans .what is a reasonable range of the number of cans ...
October 23, 2011

math
hello ya im helping my son homework.regarding estimation to get reasonable range. Three classes collected aluminum cans for recycling .one class collected 42 cans,another collected 56 cans,and the third class collected 64 cans .what is a reasonable range of the number of cans ...
October 23, 2011

Statistics
Find the normal approximation for the binomial probability that x = 5, where n = 12 and p = 0.7. Compare this probability to the value of P(x=5) found in Table 2 of Appendix B in your textbook.
October 20, 2011

HUM/111
identify two possible strategies that Thomas Hutchinson or Samuel Adams, or both, likely used to develop and improve his thinking prior to taking a stand and acting according to his beliefs.
October 14, 2011

Physics
I have the same problem and that previous answer is wrong.
October 12, 2011

Ap Chem
thanks and i understand. i appreciate your write up!
October 9, 2011

Ap Chem
Consider the following reaction at 1000°C:CO(g) + 3H2(g) CH4(g)+ H2O(g) At equilibrium, the following concentrations are measured: [CO] = 0.0613 M, [H2] = 0.1839 M, [CH4] = 0.0387, [H2O] = 0.0387 M. Calculate the value of Kc for this reaction. Calculate the value of Kp. ...
October 9, 2011

Ap Chem
Why is it possible for Kp to be less than Kc? If this is the case then when Kc>1 it favors products, but if Kp <1 than how can that reaction favor products? Or does that rule only apply for Kc
October 9, 2011

Ap Chem
Why is it possible for Kp to be less than Kc? If this is the case then when Kc>1 it favors products, but if Kp <1 than how can that reaction favor products? Or does that rule only apply for Kc
October 9, 2011

Physics
5.7
October 3, 2011

math
3/4-1/3z=1/4 5/6c-2/3c=1/3 please show step by step Thanks!
October 2, 2011

math
3/4 - 1/3z= 1/4 please show step by step to ans.
October 2, 2011

algebra
2(a-4)+15=13 Please show step by step
October 2, 2011

chemistry
4NH3 + 5O2 → 4NO + 6H2O 2NO + O2 → 2NO2 3NO2 + H2O → 2HNO3 + NO In this process, the NO made in the last reaction is recycled back into the second reaction and used as a reactant. In the end, all of the NO produced is recycled back so that when the ...
September 29, 2011

Algebra I
How do you solve the following literal equation: xp + yp = z
September 29, 2011

science[physics]
why is the pressure more on ground when a person is walking than when he is standing ?
September 28, 2011

math
i guess it's 8000
September 27, 2011

math
What is the interest amount on $1,800 for a year at 1/2%
September 27, 2011

math
how to divide 7 over 35?
September 26, 2011

Physics
Units count. Show all steps, not just the numerical substitutions. Show the equations you used. No information is missing. A person throws a ball upward into the air with an initial velocity of 15.0 m/s. Calculate the following: a.) how high it goes. b.) how long the ball is ...
September 26, 2011

Physics
A person throws a ball upward into the air with an initial velocity of 15.0 m/s. Calculate the following: a.) how high it goes. b.) how long the ball is in the air before it comes back to his hand. c.) at what time(s) will the ball pass a point 8.00 m. If you got multiples ...
September 26, 2011

math
yes
September 26, 2011

intermediate 111
Wilson Corporation began operations in January 2008, and purchased a machine for $20,000. Wilson uses straight-line depreciation over a four-year period for financial reporting purposes. For tax purposes, the deduction is 50% of cost in 2008, 30% in 2009, and 20% in 2010. ...
September 21, 2011

algebra
raise the quantity in parenthesis to the indicated exponent and simplify. (-16x^-2y^3)^2 __________ 80x^-2y^3
September 21, 2011

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