# Posts by emily

Total # Posts: 3,010

**math**

A board 5 feet long slides down a wall. At the instant the bottom end is 4 feet from the wall, the other end is moving down the wall at a rate of 2 feet per second. At the moment, how fast is the bottom end sliding along the ground?

**math**

an airline company offers a round-trip group flight from New York to London. If x people sign up for the flight, the cost of each ticket is to be 1000-2x dollars. Find the maximum revenue the airline company can receive from the sale of tickets from the flight?

**Math**

A toolshed with a square base and a flat roof is to have a volume of 800 cubic feet. If the floor costs $6 per square foot, the roof $2 per square foot, and the sides $5 per square foot, determine the dimensions of the least expensive shed.

**Math**

The width of a rectangle is two thirds its length the width of the rectangle is 10 inches what is the perimeter of the rectangle and what is the area of the rectangle

**Physics**

I understand this question: 4. If a pendulum completes 40 vibrations in a minute, what is its period? The period is the time for one complete cycle, and if the pendulum takes one minute (or 60 seconds) for 40 vibrational cycles, then it must take 1.5 seconds for one complete ...

**math**

24. Four friends attempted to write the explicit expression for the nth term of the sequence 2, 5, 10, 17, …. 24. Four friends attempted to write the explicit expression for the nth term of the sequence 2, 5, 10, 17, …. If n represents the set of counting numbers, ...

**Math algebra**

The radioactive decay of a substance is expressed by A=A^0 e^ -kt, where the initial amount A^0, decays to an amount A after t years. The positive constant k differs for each substance. Strontium 90 decays such that k=.028. Find out how much of 1,000 mg of strontium 90 remains...

**Math**

2/9x3

**English**

What is the importance of an individuals response to conflict? I have somewhat an idea but I would like to have different perspectives of people on this question so I can somewhat incorporate it into my response.

**math**

how do i put 32 ninths as a fraction on a numberline

**Physics**

The heat of fusion for water is 3.3 x 105 J/kg. How much heat energy is needed to can 3kg of ice at 0°C to water at 0°C? Show your work. Help please!! Don't give the answer, but please help me find the answer?! Thanks

**Calculus**

What would the smallest positive integer be for n if: y=sinx and y^(n) means the nth derivative of y with respect to x.

**Math**

Find d^2y/dx^2 at point P(2,1) if y is a differentiable function of x satisfying the equation: x^3+2y^3=5xy

**Math**

The average score on a recent test was 75%. One of the students earned a grade of 93% while another student earned a grade of 78%. A total of 23 students took the test. Find the average grade of the remaining 21 students.

**College alegbra**

A rancher wants to create a fence enclosing 1500 m2 of land. The plot will be divided into two equal areas by an additional fence parallel to two sides as shown in the diagram below. Find the dimensions of the plot which results in using the least amount of fencing. a. Write ...

**Math**

Find the integral ?(x^2-6x+1)/(x^2+1) dx

**Math**

If I spent 1/3 of my money on a pen and 4/7 on books how much do I have left?

**Math**

How many 6-inch long pieces of ribbon can be cut from a piece that is 3 yards long?

**Chemistry**

What volume of hydrogen, reacting with nitrogen, will produce 500 dm^3 of NH3 at STP?

**Math algebra**

If f(x) =2x-1, then f^-1(x)=???

**Trig**

What are the focus and directrix of the parabola represented by the equation:8(y-6)=(x+2)squared?

**English**

Poem Meaning "I had sat within that marble circle where the Oldest bard is as the young, And some orient dawn had found me kneeling On the threshold of the House of Fame" Flower of Love by Oscar Wilde

**Math**

Didn't work

**Math**

Find the average value of the function over the given interval and all values of x in the interval for which the function equals its average value. f(x) = 4x3 ? 3x2, [?1, 2]

**art/history**

which of the following is not an element of baroque or rococo architecture a movement b columns c ornamentation d minimalism

**math**

the mass of a moon rock is 3.5 kilograms what is the moon rock in grams

**Social Studies**

How did early humans use fire?

**math- Trigonometry**

A wire is attached to a cell phone tower at Sunshine Village. The wire is 15.6m in length, and the angle of elevation is 54°. What is the distance between the wire and the base of the cell phone tower, along the ground, correct to the nearest tenth of a unit?

**math- Trigonometry**

Ok thanks. But you are sure it is 100% correct right? I'm sorry I'm just asking because I have a test this week and I'm stressed out..

**math- Trigonometry**

A laser pointer attached at the top of a lighthouse emits a beam that makes contact with a ship in the ocean below. The length of the laser beam is 9.8km. If the ship is 4.0km from the base of the lighthouse, determine the measure of the angle of depression, correct to ...

**Math**

Susie has eight pieces of string. Three pieces are 7.8 inches long, and five pieces are 9.2 inches long. How many inches of strength does Susie have altogether?

**Math**

Susie has eight pieces of string. Each string measures 6.5 inches long. How many inches of string does Susie have altogether

**Calculus**

A solid is formed by adjoining two hemispheres to the ends of a right circular cylinder. An industrial tank of this shape must have a volume of 1600 cubic feet. The hemispherical ends cost twice as much per square foot of surface area as the sides. Find the dimensions that ...

**Calculus**

A solid is formed by adjoining two hemispheres to the ends of a right circular cylinder. An industrial tank of this shape must have a volume of 1600 cubic feet. The hemispherical ends cost twice as much per square foot of surface area as the sides. Find the dimensions that ...

**Calc**

Find the length and width of a rectangle that has the given area and a minimum perimeter. Area: 50 square feet

**Calculus**

Find the particular solution that satisfies the differential equation and the initial conditions. f''(x) = x^2 f'(0) = 8, f(o)=4 f'(t) 10t - 12t^3, f(3) =2

**Calc**

A baseball is thrown upwards from a height of 2 meters with an initial velocity of 10 meters per second. Use the fact that -9.8 meters per second squared is constant acceleration due to gravity to answer the following: The maximum height of the ball The time it takes for the ...

**Health and Physical Education**

weight to height

**Maths**

Work out the area of an equilateral triangle, with side lengths a, in sure form.

**physics**

A uniform vertical glass tube open at the lower end and sealed at the lower end is lowered into sea water thus trappung the air int he tube . It is observed that when the tube is submerged to a depth 10 meters the sea water has entered the lower half of the tube . To what ...

**Calc**

Find the particular solution that satisfies the differential equation and the initial condition. f '(s) = 10s − 4s3, f(3) = 7 & f ''(x) = 6, f '(2) = 14, f(2) = 19

**Math**

How many times greater is the 8 in the hundreds place then the 8 in the ones place explain your answer

**geometry**

well if you're going to be rude... you might as well get off this site.

**Math**

Evaluate 2n up3 -3b, if n=3 and b=1. 1.8 2.9 3.15 4.21 5.33

**Math**

If 9 apples cost $8.1 how much would 5 apples cost

**Economics**

Consider the following simplified economy described by a Cobb-Douglas production function with three factors of production: “K” is physical capital (the number of machines), “L” is labor (the number of workers), and “H” is human capital (the ...

**Spanish**

which word fits the sentance best A horse is called a ______________. A frog is called a ______________. A school is called a _____________. A kangaroo is called a _____________.

**Math**

Ramon planted 3 rows of seeds. He put 8 seeds in each row. Each row of seeds were 42 inches long. How far apart did Ramon plant the seeds

**Pre-Calc**

I know its supposed to be 1000 feet, but I just don't know how to get there. Any help would be great! Thanks so much:)

**Pre-Calc**

After release at ground level, a balloon rises 100 feet in 30 seconds. During each succeeding 30 seconds, it rises 9/10 as far as it did in the preceding 30 seconds. What is its maximum altitude above ground level?

**math**

look im not trying to be rude but the only reason everybody come on this site is to get answers so if you don't mind could you just give me the answers plz

**math**

Choose the symbol that completes the statement. 3/4_-5/6 a.< b.> c.= -1 3/4_3/4 a.< b.> c.= 2 3/4_2 4/6 a.< b.> c.= please help me can you give me the answers plz

**Pre calc**

A local salesman receives a base salary of $575 monthly. If his total sales receipts for the month exceed $1800, he also receives a commission of 11% on the portion of sales over $1800. How much would he have to sell in a month if he wants to have a monthly income of $2200?

**Chemistry**

What would be the wavelength of a 50-gram golf ball traveling at 40 meters/second? Is this large enough to be observable?

**Science**

What conflicts between humans and robots might occur in the future? Plzz Help!

**Astronomy**

Suppose we detect red photons at 674 nanometers emitted by electrons dropping from the n = 3 to n = 2 orbital in hydrogen. The hydrogen is in an interstellar cloud at 5,000 K. If the cloud were heated to 10,000 K, what would be the wavelength of the photons emitted by the ...

**Math**

thxs for not giving me such a hard time

**Math**

you give everbody else the answer the answer why cant u now please just give me the answer

**Math**

can u just do the other ones

**Math**

okay look I don't understand it can u just give me the answer plz and then ill work them out about how I got them

**Math**

I understand it I just need help please help me im a connexus studentso just please help me plz if u can

**Math**

1.which symbol completes the statement 3\8 - 1\4 a.> b.< c.= 2.which symbol completes the statement 5\8 - 11\16 a.> b.< c.= 3.which symbol completes the statement 4\6 - 6\9 a.> b.< c.= 4.order the following fractions from least to greatest 3\8,3\4,5\16,1\2. ...

**Algebra**

Two cars are traveling at 40 and 50 miles per hour, respectively. If the second car starts out 5 miles behind the first car. How long will it take the second car to overtake the first car?

**math**

A comparision Den

**Math**

The diameter of my trundle wheel is 50cm. I use it to measure the length of the school park. It rotates 87 times. What is the length of the car park, to the nearest metre?

**science**

How do I make an acrostic poem for reactants?

**american government**

4 is c, wtf is wrong with yall? who cares if leslie tries or not. leave her alone, you're all dumb pieces of sh*t. especially ms sue

**Calculus**

Find the set of points that the following function is continuous at them . f(x)= { (2x+1)/(x+3) if x<0 (√(x+4)-2)/2x^2-3xx if x>0 -1/3 if x=0

**Calculus**

Find all the values of a and b in such a way that f is continuous function on its domain. f(x)= { (√x+a)+1 if -a ≤x ≤ 0 2x^2+3 if 0 ≤ x ≤ 1 (x+b)^2+1 if x>1

**was not in class bio/ math**

Preparing a Solution: A. Calculate the amount of methylene blue chloride (MW = 319.8 g/mol) needed to make 50 ml of a 10 mM stock solution. (Show calculations below) B. If you wanted to then dilute the solution from Part A to a final concentration of 0.1mM (in 50 ml total ...

**math**

translate the following sentence into an equation: The product of 9 and four less than n is 27 is is 9(n-4)=27 or 9n-4 = 27

**Chemistry**

Do you think the copper and zinc underwent a physical change or a chemical change?

**Algebra 1**

you have $50 in your bank account and you deposit $20 per week. Write an equation for the total amount of money you have in your account after x weeks.

**Math**

CLIMATOLOGIST Each year a tree is alive,it adds a layer of growth,called a tree ring,between its core and its bark. A climatologist measures the width of tree rings of a particular tree for different years: YEAR: 1900:1910:1920:1930:1940 Width of ring:14/25:29/50:53/100:13/20:...

**Texas History**

Both answers is wrong it's C if you want to be correct just pick it it will be right becauseI chose D and it said it was wrong as well with A and B.

**English**

Revise the following sentence so that ACTIONS name KEY VERBS. 1. Our discussion was lively and fun

**Health**

Which of the answer is correct

**Social studies (Ms.Sue are these correct?)**

How did French respond when the colonies defeated the British in Saratoga in the revolutionary war Is it they formed an alliance with Germany or they were encourag d to support the patriot effort?

**chemistry**

A major component of gasoline is octane C8H18. When octane is burned in air, it chemically reacts with oxygen gas O2 to produce carbon dioxide CO2 and water H2O. What mass of octane is consumed by the reaction of 8.8g of oxygen gas? Round your answer to 2 significant digits.

**Math**

composite number: positive integer that isn't a prime number Less than 10 + greater than 6 + even: 8 - Factors: 1,2,4,8 -- composite Answer:8

**calc**

a parallelogram has an area of 150 cm^2. the side lengths are 80 cm and 40 cm what are the measures of the angles

**calculus**

A door is opened by pushing inward explain in terms of torque why this is most easily accomplished when pushing at right angles to the door as far as possible from the hinge side of the door?

**calc**

a wrench is rotated with torque of magnitude 175 N (M). the force is applied 45 cm from the pivot point at an angle of 48 degrees. what is the magnitude of the force, to one decimal place?

**calc**

Would k(a-b) x (a x c) -a +( b x c) be a scaler, vector or meaningless? (these are all vectors besides k)?

**Math**

Thank yoU!

**Math**

Mr.Adams had a coin collection including only nickels, dimes, and quarters He had twice as many dimes as nickels and half as many quarters as he had nickels. If the total face value of his collection was $300.00, how many quarters did the collection contain? A) 75 B) 100 C) ...

**Calc.**

Determine the value and value for each of the following: a) 2(3,y )-5(x,2)= (6,-4 )

**Calc.**

Find the angle between the vectors ⃗⃗u (-1,4,2 ) and ⃗v (-2,5,1 )

**Sciencr**

Why is a cool basement damp, in terms of humidity? I know that when you increase temperature and relative humidity decreases but I don't get how this fits? It's a closed environment so maybe there is condensation?

**algebra**

Yes it can be whatever you want between that given range. For example, if the slope was -0.2, (or -1/5) then, your line would go down from left to right (because it's negative) and move down 1 every time you move 5 to the right (m= rise/run) Hope that helps!

**Math**

Marie traveled to work (7km) in 25 minutes. What was her speed? I got 16.8km/h but my teacher said it's 28km/h and I have no idea how he got that. Also, how do you calculate average speed when there's more than one speed? (this is just for the next question)

**math**

First, I would put all the times to one unit. (I'm going to use minutes because I don't like working with decimals.) 1 hour: 60 minutes 1 day: 60 minutes times 24 (hours in a day) = 1440 minutes Now set up proportions: 150 people/1 minute = x people/60 minutes cross ...

**language arts**

His answer are right now what about 10 11 and 12?

**algebra**

a math exam is marked out of 120. draw a conversion graph to change the following marks to percentages. a_80 b_110 c_54 d_72

**algebra**

long-distance calls from New York to Harare are priced at 85 cents/min off peak and $1.20/min at peak times. a_ draw, on the same exes, conversion graphs for the two different rates. b_ from your graph estimate the cost of an 8 minute call made off peak. c_ estimate the cost ...

**algebra**

long-distance calls from new york to harare are priced at 85 cents/min off peak and $1.20/min at peak times. a_ draw, on the same axes conversion graphs for the two different rates. b_ from your graph estimate the cost of an 8 minute call made off peak. c_ estimate the cost of...

**Math**

I got 3B on the last scale

**Calculus**

I should probably specify that I got the area by integrating y^(-1/2) - (-y^(-1/2)) with my calculator on the interval [1,3] Sorry!

**Calculus**

Find the area of the region bounded by the curves y = x^(-1/2), y = x^(–2), y = 1, and y = 3. a) (1/2)(3)^1/2 + (4/3) b) 2*(3)^1/2 - (8/3) c) (1/2)(3)^1/2 - (32/3) d) 2*(3)^1/2 - (32/3) e) (8/3) - 2*(3)^1/2 So one thing that is throwing me off on this question is that I ...

**trigonometry**

Verify that sec(θ)/csc(θ)-cot(θ) - sec(θ)/csc(θ)-cot(θ) = 2csc(θ) is an identity. can some help me through this? thank you!