# Posts by lauren

Total # Posts: 1,824

**Statistics**

What is the probability that the average lifetime of 25 bulbs would be no more than 1550 given mean of 1500 and standard deviation of 200 hours. I know that it is asking P(x less than or equal to 1550), x is 25, u equal 1500 and sd is 200. I'm having problems getting to ...

**Statistics**

What is the probability that the average lifetime of 25 bulbs would be no more than 1550 given mean of 1500 and standard deviation of 200 hours. I know that it is asking P(x less than or equal to 1550), x is 25, u equal 1500 and sd is 200. I'm having problems getting to ...

**Statistics**

Please help me understand this is asking and how to solve. P(-2>Z and Z<-1)= and X~N(3,4). Find value c such that P(c<x)=.7 Thank You!

**Texas State History**

What is the purpose of the NAFTA treaty?

**Physics**

A pilot checks her instruments and finds that her airspeed is 345 km/h and that she is heading in a direction [S40ºW]. A radio report tells her that the wind velocity is 85 km/h [NW]. What is the velocity of her plane relative to the ground? I tried to draw ...

**history**

The 60's were a tumultuous decade: which event(s). legislation, etc. do you feel has impacted or changed history the most? thank you

**Chemistry**

When 0.010 moles of Zn(s) reacts with 30.0 mL of 1.0 M HCl, the H2 gas produced is collected in a 1.0 L flask at a temperature of 270 K. What is the pressure (atm) of H2 gas collected? Zn(s) + 2HCl(aq) à\longrightarrow ZnCl2(aq) + H2(g)

**Math**

1 pt) Consider the function f(x), for which f(0)=4 and f?(0)=?6. Find h?(0) for the function h(x)=1/f(x). h?(0) =

**Math**

One hour after x milligrams of a drug are given to a person, the change in body temperature T(x) (in degrees fahrenheit) is given by the function T(x)=x^2(1âˆ’x/3). Further, the rate Tâ€²(x) at which T changes with respect to the size of the ...

**Math**

f(x)=x^9h(x) h(âˆ’1)=5 hâ€²(âˆ’1)=8 Calculate fâ€²(âˆ’1).

**Math**

Suppose that f(x)=6x^âˆ’4+9x^âˆ’2. Evaluate each of the following: f'(3)= f'(-1)

**Math**

For what values of x is the tangent line of the graph of f(x)=2x^3?12x^2+19x+0 parallel to the line y=1x+0.7 ? Enter the x values in order, smallest first, to 4 places of accuracy:

**Calcalus**

A population P is a function of time t that had 5000 when t=0 can be written P(t)= 5000+B(t)-D(t). B(t) is the number of births since t=0 and D(t0 is the number of deaths since t=0. suppose at a given instant B=800 and dB/dt=100, and D=1000 and dD/dt=85. What is P? What is dP/dt?

**history**

i was needing help on picking the answer out of those 5

**history**

For a registered political party in a statewide election to gain ballot access, it must do the following except.. - obtain 5 percent of the vote in any statewide election. - voters cannot sign multiple petitions. - collect petition signatures equal to 1 percent of the total ...

**Chemistry**

How many grams of K2SO3 would be required to react completely with 200.0 mL of 0.245 M HCl

**organic chemistry**

The constants for Antoine’s equation for TCE (based on log10 and o C) are: A= 6.5183, B = 1018.6 and C = 192.7. If a container (negligible volume) is placed in a sealed room 1000 m3 at 30 oC, how many grams of TCE will evaporate upon reaching equilibrium with the liquid ...

**Math - Algebra 1**

A field must be fenced in. There is 212 yards of fencing material to be used. What should the dimensions of the enclosed area be to ensure that is has the largest area possible? (system of equations) Dimensions_____________________

**Math - Algebra 1**

Each cow eats 4.5 cups of feed a day and the bucket it comes in contains 250 cups. The buckets cost $26.75 each. If a farm has 16 cows, how much will it cost to feed all of the cows for 1 week? (system of equations) Cost____________________

**Math - Algebra 1**

A field must be fenced in. There is 212 yards of fencing material to be used. What should the dimensions of the enclosed area be to ensure that is has the largest area possible? Dimensions_____________________

**calculus**

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

**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? ...

**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.

**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 ...

**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"

**Physics**

Thank you so much!

**Physics**

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

**Physics**

Would the magnitude of N also be 3.72 N?

**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.

**Math/algebra**

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

**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?

**science**

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

**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).

**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.

**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.

**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!

**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!

**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

**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.

**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

**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.

**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

**Algebra 1**

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

**Algebra 1**

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

**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?

**chemistry**

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

**Chemistry**

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

**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 ...

**connections Academy sucks**

I have depression and anxiety and its much too hard. Im 40 lessons behind. I do the basic stuff on each lesson but it still takes me like 2 hours each lesson.

**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 ...

**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?

**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

**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

**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 ...

**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?

**math**

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

**math**

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

**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!!!!

**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 ...

**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 ...

**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. ...

**Maths**

*u not i

**Maths**

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

**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.

**math**

thanks!!!!

**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.

**history**

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

**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.

**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?

**history**

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

**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

**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?

**Math**

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

**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?

**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.

**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?

**LA, Check!**

Okay, thank you!

**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!

**LA, Check!**

Is it A?

**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 ...

**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 ?

**english**

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

**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

**Math**

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

**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?

**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 ...

**math**

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

**math**

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

**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?

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

Which university or college take the subjects that i am doing

**math**

Where did you get the 60 from?

**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 ...

**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 ...

**maths**

10,000 revolutions, I hope that helped :)

**Physics**

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

**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. ...

**Algebra**

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

**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?

**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+...

**math**

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