Sunday

February 7, 2016
Total # Posts: 2,417

**Calculus**

Let s(t)=-5t^2+40t be the position equation for a rock thrown upwards. At what time t, in seconds, will the rock change directions?
*May 9, 2014*

**calculus-answer check**

1. Determine the slope of the tangent to the graph of y=4/x at (1,4) my answer is -4 2.What is the slope of the line perpendicular to y=(x-2)/(x+2) at (2,0) my answer is -4 3. For which value of x is the derivative of f(x)=(x-1)^10(x+2)^5 equal to 0? my answer is 1
*May 9, 2014*

**calculus-answer check**

thanks!
*May 9, 2014*

**calculus-answer check**

Determine the slope of the tangent line to the curve y=(x^2+3x)(x^2-2) at x=-1. I got 3 as my answer although I am not too sure that it's correct. I found the derivative of the function and then substituted -1 into the equation.
*May 9, 2014*

**Calculus answer check**

thanks!
*May 9, 2014*

**Calculus answer check**

Starting from rest, a man runs 10 metres along a straight path in t seconds. His position can be described by the function s(t)=0.7t^2. How long will it take him to reach the velocity of 4m/s? would the answer be 5.6 s? I started with s(t)=0.7t^2, then the velocity is 7/5t and...
*May 9, 2014*

**Calculus**

I meant to write the equation like this: f(x)=(1/3)x^3-x^2+x-1 when x=1
*May 9, 2014*

**Calculus**

write the equation of line tangent to f(x)=(1/3x^3)-x^2+x-1 when x=1
*May 9, 2014*

**english**

one of the artists said him painting were at gray gallery
*May 8, 2014*

**math**

write a diameter if 8-pound test line in words and as a fracion
*May 1, 2014*

**Math 4 grade**

Thanks How is your work?
*April 30, 2014*

**Math 4 grade**

Yes
*April 30, 2014*

**Math 4 grade**

How much is one cola? Use the clues to find out. -The cost is between 20€ and 30€ -You can buy one cola with exactly 6 coins. -You can buy two colas with exactly 6 coins. -You can buy three colas with exactly 6 coins. -You can use pennies, nickels, dimes, or quarters...
*April 30, 2014*

**social studies 9**

Pros and cons of the Quebec Act
*April 29, 2014*

**social studies 9**

The 1763 Royal Proclamation
*April 29, 2014*

**social studies 9**

Why do you think the government has downplayed the Royal Proclamation in regard to land claims? I don't understand the question.
*April 29, 2014*

**social studies 9**

Why do you think the government has downplayed the Royal Proclamation in regard to land claims?
*April 29, 2014*

**Helpppp Math!!!**

The market value (in thousands of dollars)of a certain home is a linear function of t, the time in years since 1990. In 1992 the market value was 68 thousand dollars, while in 1997 the market value was 79 thousand dollars -Find the slope of V as a linear function of t. Explain...
*April 29, 2014*

**Math! Helppppp**

Two poles are place 15 feet apart. One pole is 8 ft high and the other pole is 16 ft high. The top of each pole is attached to the base of the other by cable which run in a straight line. -Find the slopes of the lines defined by the two ropes. -How high above the ground is the...
*April 29, 2014*

**algebria**

Suppose the population of deer in a state is 10,280 and is growing 1% each year. Predict the population after 5 years
*April 25, 2014*

**Psychology**

Is Gender a social construct referencing cultural behavioral expectations for men and women
*April 18, 2014*

**Psychology**

Changes based on biological and psychological forces are functions of
*April 18, 2014*

**geometry**

the set of lessons in this geometry course is:
*April 17, 2014*

**calculus help**

explain fully what trick you must use in order to us L'Hospital's rule for indeterminate powers?
*April 16, 2014*

**chemistry help~~~~ Please!!!**

Sodium-24, t1/2 = 15.0 hr, can be used to study the sodium balance in animals. If a saline solution containing 25 μg of 24^Na is injected into an animal, how long can the study continue before only 1 μg is left? Show work please!
*April 14, 2014*

**chem 101**

How many kilojoules of heat are needed to completely vaporize 42.8 g of C4H10O at its boiling point? Given Hvap=26.5kj/mol
*April 14, 2014*

**HELP! 5th grade math**

A triangle has 3 units. With a row of 2 connected triangles the perimeter is 4 units. What is the perimeter of a row of 20 triangles?
*April 13, 2014*

**algebra**

Ln(x+3)- Ln(x-5)=Ln7
*April 13, 2014*

**algebra**

In 1990, the population of Africa was 643 million and by 2000 it had grown to 813 million. a.) Use the exponential growth model A=A0 e^kt, in which t is the number of years after 1990, to find the exponential growth function that models the data. b.) By which year will Africa ...
*April 13, 2014*

**Calculus Help Please!!!**

A radioactive substance has a half-life of 4 days. Suppose we have 800 mg of this substance. a) Find the equation of the mass remaining after t days. Use the exact value for k not a decimal approximation. b) Rounding your answer to the nearest tenth of a mg, find the mass ...
*April 9, 2014*

**financial management**

Post your response to these questions: A budget systems model is the foundation from which budgeting systems can be used to evaluate the success of an agency or company. How are performance budgeting systems used to evaluate the efficiency and effectiveness of a human service ...
*April 7, 2014*

**social studies 9**

explain why the mohawks and the other first nations would choose to become allies with europeans, even though they knew that all the europeans were a threat to their territory and way of life
*April 3, 2014*

**math**

Find the foci x^2/49 + y^2/36 = 1
*April 2, 2014*

**Calculus Help Please!!!**

Find the absolute maximum and absolute minimum values of f on the given interval. f(x) = xe^((−x^2)/98), [−6, 14]
*April 1, 2014*

**social studies 9**

thank you
*April 1, 2014*

**social studies 9**

why are people who are attached to religious orders ideally suited to leave their home country and take residence in a new land
*April 1, 2014*

**Calculus Help Please!!!**

Compute Δy and dy for the given values of x and dx = Δx. (Round your answers to three decimal places.) y = 3x − x^2, x = 3, Δx = −0.6 Δy=???
*March 30, 2014*

**Math **

for the function y=-(1)/(x-3/4) describe the intervals where the slope is increasing and where its decreasing
*March 30, 2014*

**Calculus Help Please!!!**

A water trough is 5 m long and has a cross-section in the shape of an isosceles trapezoid that is 30 cm wide at the bottom, 70 cm wide at the top, and has height 40 cm. If the trough is being filled with water at the rate of 0.1 m3/min how fast is the water level rising when ...
*March 30, 2014*

**Chemistry Help Please!!!**

What is the greatest source of error for the hydrolysis of salts and pH of buffer solutions lab?How would you minimize this source of error?
*March 29, 2014*

**Math for grade 6 peace**

The computer club is having a fundraiser to help pay for a trip to the science museum. So far they have raised $96, which is only 48% of their goal. How much money are they trying to raise?
*March 28, 2014*

**math**

Thanks for answering!
*March 28, 2014*

**math**

Kara eats 4/5 of the food that Jillian does. If kara needs to bring 14lbs of food for the week, how much does Jillian need to bring.
*March 28, 2014*

**math**

How do you find the area of a circle with a diameter of 26 feet???
*March 21, 2014*

**Plz help me.**

i got 100% thanks to damons!
*March 13, 2014*

**Calc Help :(((((**

I got up to here. f'(x)= 3(x+3)^2(x8)^5(d/dx(x))+5(x+3)^3(x-8)^4
*March 12, 2014*

**Calc Help :(((((**

Find the derivative of the following function showing your work and fully simplifying your answer. Show steps please! Thank you!!!!!! f(x)=(x+3)^3(x-8)^5
*March 12, 2014*

**Calculus Help**

A model for the length of daylight (in hours) in Philadelphia on the tth day of the year is L(t) = 12 + 2.8 sin[(2π/365)(t − 80)]. Use this model to compare how the number of hours of daylight is increasing in Philadelphia on March 21 and April 21. (Assume there are...
*March 9, 2014*

**Calculus **

for what values of r does the function y=e^rx satisfy the differential equation y''-4y'+y=0 Show steps please! Thank you!
*March 7, 2014*

**social studies 9**

Create a dialogue between a Huron chief and a Jesuit missionary in which both present their best arguments for and against allowing the Jesuits stay and work in Huronia.
*March 6, 2014*

**social studies 9**

What social values would have led Jacques Cartier to kidnap the sons of the Iroquois host at the Gaspe Peninsula and take them to Europe?
*March 6, 2014*

**science HELP ASAP!!!!!!!**

thanks so much got 100%
*March 4, 2014*

**HELPPPP NOOWW !!!!!**

her she I I them indirect object of preposition none of above hers his yours its
*March 4, 2014*

**banking**

Suppose you borrow $5,000 and make 12 equal payments to retire the debt. If the finance charge for the loan is $400, what will the amount of each monthly payment be?
*March 3, 2014*

**banking**

If 6 percent of all credit card charges never get paid, and total credit card charges last year were $750 billion, what was the total amount of unpaid credit card charges last year?
*March 3, 2014*

**Banking**

Becky has a balance of $2,000 on her credit card. Her minimum payment is $40 on a card with an APR of 17 percent. How much of that payment will go toward paying the interest?
*March 3, 2014*

**chem**

How many moles of CO2 are produced from 0.160mole O2?
*March 3, 2014*

**statistics**

the average score on the statistics quiz was a 70, and there was a standard deviation of 10 points. If the z-socre was -1.0 what is the percentile rank?
*March 2, 2014*

**Science**

Type webelements in your search box, and that website will give you all the kind of information of all kinds of elements. Just click: Chemistry » Periodic Table » essential data and description
*February 28, 2014*

**Help!**

I think; I believe it's C. The new director promised to restore order in the department
*February 28, 2014*

**Math **

Determine an equation in simplified form, for the family of quadratic functions with zeros -1 -+ √5 and 2 -+ √2 B) determine an equation for the member of the family whose graph has a y intercept of -32
*February 24, 2014*

**math**

A school spent $1,802 on 6 new microscopes for science classes. Each microscope cost the same amount of money. Find the cost of 1 microscope. Show your work.
*February 22, 2014*

**Math**

Make a systematic list - PSM 81 - page 19 Carla and Nick were playing a factors game. Carla would name a factor of 48 and Nick would give the other factor. Make a table to show the different way Carla and Nick could play the 48 game. Please help. -- someone know what the book ...
*February 18, 2014*

**chemistry**

a metal object has a mass of 8.37g. when it was placed in a graduated cylinder containing 20.0ml of water, the water level rose to 23.1 ml. what is the density and identity of the metal?
*February 16, 2014*

**Personal Dimensions of Education**

is
*February 16, 2014*

**Art-plz check!!**

1. Mount Rushmore 2. a message of fear and power 3. use of an icon 4. Kente 5. haik 6. art movement 7. both b and c 8. romantic 9. scale drawing 10. atmospheric perspective
*February 13, 2014*

**statistics**

A false positive rate of 5% is considered to be a conservative estimate. Suppose that there are 20 employees in your company, which tests its workers weekly. What is the probability of no false-positives for this week’s test?
*February 12, 2014*

**english**

In the metaphor of language as a layer cake given in your study unit, which of the following words could be considered to be a frosting word?
*February 12, 2014*

**Math**

The sum of two numbers is 30. The first number is 1/5 the second number. What are the numbers
*February 11, 2014*

**science**

A ball weighing 1.78 N is shot through a launcher,achieving a speed (from rest) of 41 m/s in 0.28s. What is the mass of the ball.
*February 3, 2014*

**math**

Seven students took a quiz. Four of these students received a score above 85 percent. Students who received at least an 85 percent got a sticker. What percent of the students (rounded to the nearest full percentage number) received a sticker?
*January 21, 2014*

**math**

51.A sequence t is defined where the first term is –4. Each successive term is 3 more than the term before it. (a)Write an explicit formula for the sequence t. (b)A second function is defined as s(n) = 2 + 2n. Compare the rates of change of t(n) and s(n). (c)For what ...
*January 2, 2014*

**Algebra 1B**

The polynomial given by 1.6t^ 2 - 28t + 200 calculates the heart rate, where t represents the elapsed time in minutes since exercise stopped. 1. What is the heart rate when the athlete first stops exercising? 2. What is the heart rate after 5 minutes? 3. Describe what happens ...
*December 22, 2013*

**chemistry**

thanks KS, 31 is A
*December 19, 2013*

**Ratio--math**

what is 14/J= 42/12
*December 18, 2013*

**Algebra 1B**

3x^²-12x+4 for x=-2 What are the exact steps when getting an answer?
*December 18, 2013*

**5th grade math**

Thanks
*December 15, 2013*

**5th grade math**

Is the correct answer 27?
*December 15, 2013*

**5th grade math**

To nearest whole number, what is 106.37 - 78.89? Can you show me please?
*December 15, 2013*

**5th grade math**

Rounded to the nearest tenth, what is the sum of 47.368 + 58.75?
*December 15, 2013*

**please help me!! with this science!!!!!**

tris is correct got 100%
*December 11, 2013*

**Math**

I'm having trouble with working a problem out and need to see how to solve. The question reads as follow: Mark has 24 baseball cards. He says that 8/24 are pitchers, 5/24 are catchers, and the rest are fielders. What fraction below represents the difference between the ...
*December 9, 2013*

**algebra**

Thank you, Jai!
*December 7, 2013*

**algebra**

For a motor vehicle travelling at r miles per hour, the distance d in feet required to stop at approximately d=0.05r^2+r. If a school bus is traveling at 45mph how many feet to, the nearest foot,would it travel before coming to a halt.
*December 7, 2013*

**math**

The probability of not picking a purple marble out of a bag of marbles is 2/5, if 2 purple marbles are taken out of the bag, reducing the number of purple marbles to 4, what will the new probability of picking a purple marble be?
*December 6, 2013*

**math**

The length of a rectangle is three times its width. If the area of the rectangle is 48, what is its length?
*December 6, 2013*

**poetry**

What mood best describes "Elegy Written in a Country Churchyard"?
*December 5, 2013*

**Math :)**

1.Try to solve this problem without using a formula. Suppose a disease is transmitted from an individual to one other during the period of a week. Each of those two gives the disease to two more people in the second week, so that the total of newly infected people is now four...
*December 2, 2013*

**statistics**

whether it is one-tailed or two tailed? and if one tailed...I do agree with you now that this is the left tail test. However I am not sure how to handle negative value on t. Here is what I did. I used formula for hypothesis test with mu unknow, t=(xbar-mu)/(sd/sqr n)=(26-25.02...
*November 30, 2013*

**statistics**

what test are you using? This is very confusing!
*November 30, 2013*

**statistics**

Ala rge fleet of cars is maintained with an average of 26 mpg. 50 recent trips displayed a mean of 25.02 mpg and standard deviation of 4.1 mpg. At the 5% level of significance, is their evidence the company has failed to keep their fuel goals? I did the math and got .03380315...
*November 30, 2013*

**Statistics**

Thank you, I got the same answer, but I thought that because the sample size was less than 30, there was something I missed.
*November 29, 2013*

**Statistics**

Hello, my problem is I have a random sample of only 15 sales average is $115 with a known population standard deviation of $25.00. Obtain a 92% confidence interval and explain what your answer means. I am not sure what to do because the sample size is only 15. Thanks for your ...
*November 29, 2013*

**Finance**

Buy a stock for $35 a share, hold it for 3 years, and then sell it for $75 a share (the stock pays annual dividends of $2 a share).
*November 24, 2013*

**Math **

1. Jill has a bond with a face value of $1,000. The bond has a coupon rate of 6%. Find her current yield if the market price of the bond is $1,027. 2. Calculate the annual interest you receive on a $1000 Treasury bond with a current yield of 1.5% that is quoted at 98 points. I...
*November 18, 2013*

**chemisty**

When magnesium metal and an aqueous solution of hydrochloric acid combine, they produce an aqueous solution of magnesium chloride and hydrogen gas. Using the equation, Mg (s) + 2HCl (aq) MgCl2 (aq) + H2 (g), if 24.3 g of Mg and 75.0 g of HCl are allowed to react, calculate the...
*November 17, 2013*

**Math Help**

Wow it's a shame that I can't get help:(
*November 16, 2013*

**Math Help**

Does anyone know about this? This is really hard and I'm in lots of need:)
*November 16, 2013*

**Math Help**

This homework question was removed due to a copyright claim submitted by the National Network of Digital Schools Management Foundation (NNDS). Please answer this ASAP! Thank you so much whoever answers! :)
*November 16, 2013*

**physics**

a toy rocket is fired upward with a net force of 50N. Because of this force it accelerates at 25m/s^2. What is the mass of the rocket?
*November 16, 2013*