Saturday

January 21, 2017
Total # Posts: 1,815

**calculus**

use implicit differentiation to show: d/dx(tan^-1x)=1/(x^2+1)

*December 16, 2016*

**Stats -Math**

1. We are interested in conducting a study in order to determine what percentage of voters of a state would vote for the incumbent governor. What is the minimum size sample needed to estimate the population proportion with a margin of error of 0.05 or less at 95% confidence? ...

*December 12, 2016*

**math**

Yes, the slope of both lines is 0.5, which means the lines really are parallel. They never intersect, so there is no point that lies on both lines, and no solution to the system.

*December 12, 2016*

**history**

Using the map and your knowledge of U.S. history, what do the details of the Rocky Mountains suggest about the Lewis and Clark expedition? A)The group made a grave mistake in not turning back in Missouri. B)The group really could have traveled by river all the way to the west ...

*December 6, 2016*

**Physics**

A tennis ball is served from the back line of the court such that it leaves the racket 2.4 m above the ground in a horizontal direction at a speed of 22.3 m/s. (a) will the ball cross a 0.91-m-high net in front of the server? Will the ball land in the service court, which is ...

*December 1, 2016*

**texas history**

i need help on figuring out a topic "The topic of your report must be an issue that is being addressed by both the state and federal government"

*November 23, 2016*

**Physics**

Thank you so much!

*November 16, 2016*

**Physics**

N be going up on the knife edge with the 0.200 kg mass.

*November 16, 2016*

**Physics**

Would the magnitude of N also be 3.72 N?

*November 16, 2016*

**Physics**

A meter stick whose mass is 0.200 kg is supported at the zero cm mark by a knife edge and a force F at the 100 cm point. A mass of 700 grams is attached to the stick at 40 cm mark. Find the magnitude of N and F in Newton's.

*November 16, 2016*

**Math/algebra**

Thank you for helping me Ms.Sue^.^ ?^?

*November 16, 2016*

**Math/algebra**

Sandy drives the first 3 hours of her trip at 65 miles per hour. The last hour of the trip she drives 62 miles per hour. How far did Sandy drive on her trip?

*November 16, 2016*

**science**

What is the volume of chlorine that is used to produce 292 grams of hydrogen chloride?

*November 8, 2016*

**maths**

Calculate the lengths of the straight lines joining the following pairs of points, leaving your answers in surd form: (a) A(4,-3), B(7,6).

*November 1, 2016*

**maths**

The points A(1,5) and B(9,3) are part of a triangle ΔABC. The triangle has a right angle at A and and sides satisfy AB=2AC. Find a point C such that C lies above the line AB.

*October 31, 2016*

**maths**

Consider the 4 points A(1,5), B(-4,6), C(0,0), D(-12,12). Find the gradients of the lines: (a) AB; (b) CD; (c) BD.

*October 31, 2016*

**Maths**

By making the substitution u =ln x show that the following equation has exactly one real-number solution: 9/ln x + ln x^4 =-12 Sorry wrote the incorrect equation previously!

*October 27, 2016*

**Maths**

By making the substitution u =ln x show that the following equation has exactly one real-number solution: 9/ln x + ln x^4 =-12 Sorry wrote the incorrect equation previously!

*October 27, 2016*

**Maths**

By making the substitution u =ln x show that the following equation has exactly one real-number solution: -12/ln x +ln x^4 = -9

*October 27, 2016*

**Maths**

By making the substitution u=7^x and using part a, derive a hidden quadratic equation 7^(2x-1) +4×7^(x-1) -1/14 =0 and hence find all of the solutions to the above equation.

*October 27, 2016*

**maths**

By making the substitution u =ln x show that the following equation has exactly one real-number solution: -12/ln x +ln x^4 = -9

*October 26, 2016*

**maths**

By making the substitution u=7^x and using part a, derive a hidden quadratic equation 7^(2x-1) +4×7^(x-1) -1/14 =0 and hence find all of the solutions to the above equation.

*October 26, 2016*

**Maths**

Let u=7^x. Using the rules for powers show that i) 7^x-1 = u÷7 and ii) 7^2x-1 = u^2÷7

*October 26, 2016*

**Algebra 1**

So how do I write it in step by step form, for an essay?

*October 25, 2016*

**Algebra 1**

Is that the answer? 2 x (2 x^2 + x + 1)? Or do I need to factor it, like it says?

*October 25, 2016*

**Algebra 1**

f (x) = 9x^3 + 2x^2 - 5x + 4 and g(x) = 5x^3 - 7x + 4. What is f (x) - g(x)? Show all your stes and write your final answer in factored form. I am really stumped on this, could someone help me?

*October 25, 2016*

**chemistry**

Why do some reactions go to completion while others reach a state of equilibrium?

*October 24, 2016*

**Chemistry**

Determine the mass of urea, CH2N2O, required to make 250mL of a 0.235 M solution

*October 20, 2016*

**Math**

1) A television tower is 160 feet high and an observer is 120 feet from the base of the tower. Find, to the nearest degree, the angle of elevation of the top of the tower from the point of observation. 2) A vertical pole 22 meters tall casts a shadow 16 meters long on level ...

*October 13, 2016*

**Chemistry**

3. What experimental problems would confront you if you attempted to determine the concentration of the metal ions in solutions of each of the following reagents? a. Cr +3 which has a maximum absorbance at 407 nm with absorbtivity of 15 M -1 cm -1 and another at 574 nm with ...

*October 2, 2016*

**Organic Chemistry**

Compound A has solubility at 20 degrees celsius of .029 g / 10.0 mL. How much of compound A will remain in solution after cooling to 20 degrees C?

*September 26, 2016*

**Chemistry**

Given a 800 mg sample of Thorium-231 decomposes via beta emission with a half life of 25.5 hours, how long would it take, in days, for the sample to decay down to 25 mg? 231 0 231 Th -> Beta + Pa 90 -1 91 800 mg/ 25 mg

*September 23, 2016*

**precalc**

A Norman window has the shape of a square with a semicircle mounted on it. Find the width of the window if the total area of the square and the semicircle is to be 240 ft squared

*September 13, 2016*

**Physics**

A baseball is his so that a travel straight upward after being struck by the bat. A fat observes that it takes three seconds for the ball to reach its maximum height. Find the balls initial velocity and the height it reaches. my professor showed a similar problem to this but ...

*September 9, 2016*

**math**

John can cut the grass in 4 hours working by himself. When john cuts the grass with his younger brother michael, it takes 3 hours. How long would it take michael to cut the grass by himself?

*July 21, 2016*

**math**

I think so , i was pretty distressed regarding this matter,thank you for helping me.

*July 12, 2016*

**math**

i took algebra 2,but i don't know why my teacher didn't bother to teach me this topic

*July 12, 2016*

**math**

Are trigonometric functions taught in 11th grade, if so ,is it wrong that i wasn't tought that topic in 11th grade????plz help!!!!

*July 12, 2016*

**Maths**

Steve - you answered this question earlier for someone else and gave them the formula for how to answer it. I have the same problem in my homework and have used the formula you gave, but have got an answer that does not appear in the answer options. I got 12.75 Would you be ...

*July 8, 2016*

**Maths**

Steve - you answered this question earlier for someone else and gave them the formula for how to answer it. I have the same problem in my homework and have used the formula you gave, but have got an answer that does not appear in the answer options. I got 12.75 Would you be ...

*July 7, 2016*

**Science**

sodium can be extracted by heating naturally occuring salt until it is molten. an electrochemical process is then used to extract the sodium. cl2 is produces at the anode and Na is collected at the cathode. write the half-reactions that occur at the anode and the cathode. ...

*July 7, 2016*

**Maths**

*u not i

*July 7, 2016*

**Maths**

In3/In1.09=12.75 should I choose answer 12.2?

*July 7, 2016*

**english**

how do put an author of a research article and where they are from in apa format example author: Daniel S. Budnitz, M.D., M.P.H.

*June 27, 2016*

**math**

thanks!!!!

*June 23, 2016*

**math**

when dealing with sigma notation, if i enclose my formula with parenthesis,does it make it different from a formula with no parenthesis? plz help, I saw this in regents prep webpage and I just didn't see any difference, but they say that the parenthesis changes the result.

*June 23, 2016*

**history**

Andrew Jackson in 1828 & 1832: a) what policies or actions were not good b) what policies or actions were good

*June 22, 2016*

**English**

I was assigned to write an essay,after writing it ,I started to question my writing, and I just cannot decide on whether I should use passive or active voice for this kind of formal writing. ..yes,I have researched, but can't establish which one is more adequate.

*June 17, 2016*

**Chemistry**

the question says: Calculate the mass of soap (NaC17H35COO) which contains 1.25 grams of Carbon. Do I use the percentage composition of soap and the mole?

*June 14, 2016*

**history**

compare & contrast the accomplishments, shortcomings of the first four presidents: Washington, Adams, Jefferson, Madison thank you

*June 14, 2016*

**Math**

A cone-shaped pile of sawdust has a base diameter of 40 feet, and is 15 feet tall. Find the volume of the sawdust pile. Round your answer to the nearest hundredth if necessary. Use 3.14

*June 8, 2016*

**math**

Tory and Emilio's motorboats travel at the same speed. Tory pilots her boat 40 km before docking. Emilio continues for another 4 hr, traveling a total of 90 km before docking. How long did it take Tory to navigate the 40 km?

*May 10, 2016*

**Math**

An suv drove 54 miles using 3 gallons of gas at this rate how far could it drive with 5 gallons of gas?

*May 8, 2016*

**Chemistry**

A sample of 20.0 g of chlorine gas at 15 degrees Celsius occupies a volume of 5.0 L. What is the pressure of the gas?

*May 7, 2016*

**Chemistry**

What volume of oxygen gas is needed for the complete combustion of 4.00 L of ethane gas, C2H6? Assume that the temperature and pressure of the reactants are the same.

*May 7, 2016*

**math**

The current in a stream moves at a speed of 4 mph. A boat travels 24 mi upstream and 24 mi downstream in a total time of 14 hrs. What is the speed of the boat in still water?

*May 3, 2016*

**LA, Check!**

Okay, thank you!

*April 28, 2016*

**Help! LA!**

Hello? Ms. Sue? Are you going to not answer me? Just, please? Someone help me, it will make a world of difference for me!

*April 28, 2016*

**LA, Check!**

Is it A?

*April 28, 2016*

**LA, Check!**

Read the statements Which group is contrasting in point of view? A. "Some people feel that there is lots of wild space that animals should only live there. Other people feel that there is very little wild space left." B. "Humans are destroying the Earth's ...

*April 28, 2016*

**Math**

A quiz contains three True/False questions. If a student attempts to answer the questions by guessing, what is the probability that the student will answer all three questions correctly ?

*April 25, 2016*

**english**

what role did religion play in "Mr Pirzada Came to Dine" and "My Two Lives" by Jhumpa Lahiri thank you

*April 25, 2016*

**math**

what is the third term necessary to make this a perfect square trinomial? what is the binomial quantity squared it is equivalent to? x^2 - 9x _______= (________)^2 x^2 + 10x _______= (________)^2

*April 21, 2016*

**Math**

3729tan(7) = 457.8 so the answer would be A, 458 meters.

*April 19, 2016*

**social studies { somebody please help me please**

1. D 2. B 3. C

*April 7, 2016*

**Math**

Her has $1500 in a retirement account earning 5% interest compounded annually. Each year after the first, she makes and additional deposits of $1500. After 5 years , what was her account balance if she did not make any withdrawals?

*April 6, 2016*

**Math**

Range invested $1000 for college in an account earning 5% simple interest. When she withdrew the investment , she had earned a total of $550 in interest. How long was the money invested. How long was the money invested? I did 1000(.05) (t) - whatever she withdrew She earned a ...

*April 6, 2016*

**math**

yea im supposed to subtract them. all the directions say is to subtract.

*March 31, 2016*

**math**

how do i solve 3√8x^2y^3 - 5x√32y^3 or 4√98y^11 - 9√128y^11

*March 31, 2016*

**MAth**

Your lawnmower uses a gasoline and oil mixture for fuel. For every 2 gallons of gas you add 18 ounces of oil how much oil should you add for 5 gallons of gasoline?

*March 6, 2016*

**Maths literacy ,life science,history,geography**

Which university or college take the subjects that i am doing

*March 4, 2016*

**math**

Where did you get the 60 from?

*March 3, 2016*

**math**

one estimate for the ideal body weight of a woman is shown below. use this information to answer part (a) through (d) 55kg+1.5kg for each inch over 5 feet (a) find a linear model for an estimate of the ideal weight of a woman using W for ideal body weight (in Kg) and H for ...

*March 3, 2016*

**English**

Just did this assignment. All the answers are correct

*February 28, 2016*

**physics**

A 35 micro coulomb point charge is placed 32 cm from an identical 35 micro coulomb charge. How much work would be required to move a 0.50 micro coulomb test charge from a point midway between them to a point 12 cm closer to either of the charges? i got an answer of -2.954 J ...

*February 11, 2016*

**maths**

10,000 revolutions, I hope that helped :)

*February 6, 2016*

**Physics**

So for A is the answer just G?? For d is the answer -3/4mg

*February 6, 2016*

**Physics**

A body of mass m falls from rest through the air. A drag force D = bv^2 opposes the the motion of the body. The acceleration due to gravity is g. A) What is the initial downward acceleration of the body? B) After some time the speed of the body approaches a constant value. ...

*February 6, 2016*

**Algebra**

If I Have 27 Questions And I Have 22 Correct What Did I Get On My Test The Percentage ?

*February 3, 2016*

**Math**

A $15 item on sale for $12 is marked down what percent? 100 * $12 = $1200 $1200/$15 = $6000 Did I do the correct work, or is it this: 100 * $3 = $300 $300/$15 = $4500 Is the first work correct or is the second work correct?

*January 28, 2016*

**physics**

When driving west toward the Rocky Mountains, you see a peak 2.6 ∘ above the horizon. Your GPS gives your current elevation as 1490 m , and according to the map, you're 25.0 km (horizontally) from the peak. Find the peak's elevation. I thought it would be 1490+...

*January 27, 2016*

**math**

it comes out to be 655.4 so would it just be a 65.54?

*January 24, 2016*

**math**

if the lecture grade is the mastering points worth 20% and exams worth 80%. what is the lecture grade? mastering points: 1513 exam grades: 92,83,76,95,95 thank you!

*January 24, 2016*

**Math**

For question 3-4, use your calculator to create a scatter plot and line of best fit for the following set of data: Average height of a species of tree (in feet) after a certain number of years. Years:1/2/3/4/5/6/7/8 Height:2.1/3.2/6.8/7.3/11.2/12.6/13.4/15.9 3.What is the ...

*January 14, 2016*

**math**

Can somebody please help me with this? Everyday for a week, he counts how many times each player can leg press 350 pounds. The following week, he has each player sprint 40 yards every day. The table shows the average number of leg-press reps and the average 40-yard dash time (...

*January 5, 2016*

**Math**

Erica knits 18 squares on Monday. She knits 7 more squares each day for the rest of the week. How many squares does Erica have on Friday?

*December 10, 2015*

**algebra**

a water rocket is launched with an initial velocity of 112ft/sec. its height h, in feet T seconds is given by the formula h=112T-16T^2. when will the rocket be exactly 192 ft above the ground? the rocket first reaches a height of 192ft after _____ and reaches 192ft a second ...

*December 5, 2015*

**Algebra 1**

given the scatterplot below,which of the following equations would best model the date?explain your choice.(1)y=-3x+6 (2)y=6(2)x (3)y=-4xsquared+20x+3 (4)y=2xsquared-6x+4

*December 3, 2015*

**government**

how can the community reduce discrimination? how can we use the arts to reduce discrimination? thank you!

*November 30, 2015*

**Math**

Find the value of x so that the line through (-4,-5) and (3,3) is perpendicular to the line through (-4,4) and (x,-5).

*November 30, 2015*

**7th Grade Proportion Help**

Thanks this helped a lot.

*November 19, 2015*

**Social Studies**

What role did freed slaves play in Shermans capture of Atlanta?

*November 18, 2015*

**Social Studies**

was it General Ulysses S. Grant?

*November 17, 2015*

**Social Studies**

who was the general of the union forces

*November 17, 2015*

**Social Studies**

who was the commander of the forces that fired the first shot of the civil war

*November 16, 2015*

**Social Studies**

what contribution did henry clay make to the issue of slavery

*November 12, 2015*

**Social Studies**

What present day states belonged to Mexico in 1820?

*November 11, 2015*

**math**

you would do 27 times 11

*October 26, 2015*

**math**

it doesnt say, but I over- looked it and its a two part answer the first question says: We traveled 135 miles to the lake on 5 gallons of gas. we had to figure out the unit rate which was 27 miles per one gallon.

*October 26, 2015*

**math**

What distance did the car travel if we used 11 gallons of gas to travel the mountains? use a tape diagram to show how you found the miles traveled. I don't know how to solve this question

*October 26, 2015*