# Posts by anonymous

Total # Posts: 108,424

math
Verify: tan^2a=cot^2a-cot^2acsc^2a

Math
Verify: tan^2a=sec^2a tan^2a-1

Statistics
50 apples from an orchard are randomly selected. A mean apple diameter of 2.22 inches is calculated with a margin of error for a 95% confidence interval of ±0.13. What is the interval estimate of the population mean? 1.99 < ? < 2.23 2.09 < ? < 2.35 2.09 <...

Calculus
A particle's position along the x-axis is given by x(t) = t^4/24 - t^3/2 + 2t^2 - 1. What is the maximum acceleration on the interval 0 <= t <= 4? I found the acceleration to be (t^2 - 6t + 8)/2 and the derivative of the acceleration to be t - 3. I thought the ...

Calculus
A differentiable function called f(x) achieves its maximum when x=0. Which of the following must then be true? 1. The function p(x) = xf(x) has a critical point when x = 0. 2. The function m(x) = (f(x))^2 has its maximum at x = 0. 3. The function j(x) = f(x^2) has its maximum ...

Algebra 2
I'm so sorry!! I actaully meant f(x)=2sin(x/2)-1

Algebra 2
What effect does changing the function f(x)=2sin(x2)?1 to the function g(x)=2sin(x)?5 have on the graph of f(x)? The graph is stretched vertically by a factor of 2 and shifted right 4 units . The graph is compressed vertically by a factor of 2 and shifted left 4 units . The ...

EXAM TOMORROW
Building new,stable houses and shops

Math
Divide (-6m^9 - 6m^8-16m^6) / 2m^3 I get -3m^12 -3m^11 - 8M^9 NOT A CHOICE ON PAPER could it be -3m^9 -3m^8 -8m^6

physics
the half life of radium is 1600 years of 100 grams of radium existing now 25 grams will remain after how many years

Math
950,000*.10 = 95,000 950,000-95,000 = 855,000 (1yr) 855,000*.10 = 85,500 855,000-85,500 = 769,500 (2yr) Repeat the process until reach 5 yrs.

social
How did social controls shape Japanese identity and citizenship?

Geometry
Find the area. The figure is not drawn to scale. 6.9 4cm

How does the aggregate expenditure multiplier change given a decrease in marginal propensity to import and marginal propensity to consume?

Economics
Explain how each will impact the size of autonomous expenditure multiplier, other variables constant. (a) Decrease in marginal propensity to consume (b) Decrease in marginal propensity to import

Chemistry
A copper electrode weighs 35.42 g before the electrolysis of a CuSO4(aq) solution and weighs 36.69 g after the electrolysis has run for 20.0 min. What was the amperage (Amps) of the current used? this is the equation that i used is it correct (1.27g Cu x 1 mol Cu x 2 mol e- x ...

geometetry
Given: KLMN is a trapezoid, m?K = 90°, LM = 9, KN = 18, MN = 15 Find: Area of KLMN LM and KN are parallel

statistics
Suppose that diastolic blood pressure readings of adult males have a bell-shaped distribution with a mean of 84 84 mmHg and a standard deviation of 9 9 mmHg. Using the empirical rule, what percentage of adult males have diastolic blood pressure readings that are greater than ...

Geometry
Given: KLMN is a trapezoid, KL = MN, m?LKM=m?MKN, LM:KN = 8:9 , Perimeter KLMN = 132 LM and KN are parallel Find: The length of the legs. I reposted this question because the last time was not vary clear, and I got 49 but it is wrong

Music
What is the note called that has 4 beats?

geometry
P stands for the perimeter, and LM and KN are parallel. angle one is LKM and angle 2 is MKN

geometry
Given: KLMN is a trapezoid, KL = MN, m?1=m?2, LM:KN = 8:9 , PKLMN = 132 Find: The length of the legs. I got 49, but it was wrong

bio
salt does it have more free enrgy when dissolved in water

Work
i am primarily cream in color but speckled in grey. round is not my shape, nor is square. i am a loner in my environment. if i could speak, the stories i would tell.

English
What two word are the most opposite in meaning hanker grovel hurtle and patronize

Chemistry
A system has an initial energy of 117 joules. The energy equation includes --40.1 J of heat and -20.3 J of work. What is the final energy? Was heat added to the system or to the environment? Was work done by the system or to the system? Be sure to show all of your work and ...

80% of an airline's flights depart on-time and 20% do not. Of those that depart on-time, 95% arrive on-time. OF those that depart late, 10% arrive on-time. What is the chance of someone taking a flight that will arrive on-time?

math
Mrs. Davis planted red flowers in 0.6 of her garden. She also planted yellow flowers in 0.4 of her garden. In 0.5 of the part with red flowers she also planted white flowers. What part of Mrs. Davis' garden has both red and white flowers?

algbra
Solve the inequality ?4y + 6 < ?14. A. y > 2 B. y ? 5 C. y > 5 D. y < 5

MATH
Convert r^2=3/(tanx) into cartesian form. I got this so far: r^2=3/(tanx) x^2+y^2=3x/y What do I DO NEXT????

Chemistry
Give the formal charge on the sulfur atom in a Lewis structure for the sulfate ion in which every atom satisfies the octet rule. Based off my lewis structure, I think the formal charge of the the sulfur atom would be +2. Is that correct?

English
the story of disabled athletes who became well known

Maths
Given that the line y=mx+c is a tangent to the circle (x-a)^2+(y-b)^2 = r^2 show that: (1-m^2)r^2=(c-b+ma)^2

Math
Thank You!! This really helped me!!

Math
Algebra 1 Simplify the radical _____ 5_/700 I'm confused on what to do with the 5...

Maths
show that the circles x^2 + y^2 - 10x - 8y + 18 = 0 and x^2 + y^2 - 8y - 4y + 14 = 0 do not intersect

Algebra
Explain how to use the measures of a right triangle to calculate the exact value of sin 30 degrees? How can this information be used to determine the exact value of sin 60 degrees?

maths
show that the circles x^2 + y^2 - 10x - 8y + 18 = 0 and x^2 + y^2 - 8y - 4y +14x = 0 do not intersect

Social Studies
Thank you :)

Social Studies
Which country today has the largest muslim population. A. Iraq B. Indonesia C. Iran D. the United states

math
A cable channel survey showed that about 50% of subscribers preferred watching a comedy to an action movie on Saturday nights. If you want to estimate the probability that exactly two of three randomly picked subscribers prefer watching an action movie on a Saturday night, how...

Psychology
I am curious as to how someone who distributes a personality test would be able to decipher who is and who is not telling the truth on the test? If the test is straightforward such as "are you a liar?" obviously that is not desirable and people could just answer '...

social studies
Is Plato now of the teachers of Hippocrates (the Father of medicine)

Math
18.125

Math
A baby weight 7.25 at birth at the end of a eight months the baby weight 2 and a half times its birth weight how many pounds did the baby weight at the end of eight months

math
what's the solution for y=2x-1 and y=x+3

MAth
3a +4/4a+4 x a^2 - 6a -7 Asking for the product so confused

accounting
The following information was available as of the close of business June 1, 2004 on government of Canada bonds. Coupon...Maturity.....Price.....Yield 5.00%......June 1, 2005......102.35......2.60 10.50%......June 1, 2006......113.91......3.26 8.50%......June 1, 2007.....107.41...

Physics
What does it mean when the position vs. time graph is below the x-axis?

science

math
answer How do you write a song hat will knock over a cow?

physics pls help i found answer but its wrong
kgm^2/s^2 is also J for units

physics pls help i found answer but its wrong
Some dragonflies splash down onto the surface of a lake to clean themselves. After this dunking, the dragonflies gain altitude, and then spin rapidly at about 1100 rpm to spray the water off their bodies. When the dragonflies do this "spin-dry," they tuck themselves ...

math
A swimmer swam 0.8 mi at 0.0323 mi per min in waters created by melted sea ice. What was his? time?

physics
Find the coordinate of the center of mass of the bricks shown in the figure.(Figure 1) Express your answer in terms of L. <------------ L---------> <---L4---> ---L2------> -------------------------------------------> 0 X

Algebra 1
Thank you

Algebra 1
I am changing my answers to the first question as A and the second as C

Algebra 1
How many solutions does this system have? y=x+5 y=?5x?1 A. One B. None C. Infinite D. Two** Which best describes a system of equations that has infinitely many solutions? A. Consistent, independent B. Inconsistent, dependent C. Consistent, dependent D. Inconsistent** I'm ...

physic - stress and strain
Sample 1, Original Length 250 mm and 10 mm Diameter, Length after testing 250.23 mm the force used for the test was 15KN Calculate the Stress and Strain for each of the Samples and from this and, assuming the material has remained within the elastic limit, determine their ...

History
So.... D?

History
Why did Seward buy Alaska? A)To access Alaskan gold. **B)To kick Russia out of North America.** C)To increase trade in Asia and the Pacific. D)To develop desirable land.

maths
Sample 1, Original Length 250 mm and 10 mm Diameter, Length after testing 250.23 mm the force used for the test was 15KN Calculate the Stress and Strain for each of the Samples and from this and, assuming the material has remained within the elastic limit, determine their ...

Physics
a body moving with uniform acceleration travels 84m in First6s and 180m in next 5s . Find the initial velocity and acceleration of body

Science
How will resistance change when the voltage increases in an electric circuit if the current remains constant

Science
6.022*10^22 in one bank

Science
6.022*10^22

maths
Jake is mapping out important family events. He uses negative numbers to represent time before he was born and positive numbers to represent time after he was born. For example, Jake's mum was born in year âˆ’20, and Jake's sister was born in year 5. ...

Chemistry
The measured pH of a 0.100M solution of NH3(aq) at 25C is 11.12. Calculate Kb for Nh3(aq)at 25C.

Juvenile Justice
I was finally able to find the answer to be kent v u.s. in my textbook (in a different chapter that the question was from!) Thank you for the help, it was useful in confirming my answer!

Juvenile Justice
What Juvenile case eliminated the hands-off doctrine for juvenile courts?

Algebra
2x^2-5x-12/10x+15

algebra
A fish can swim 45 miles downriver in the same amount of time that it can swim 27 miles upriver. Solve for the speed of the current if the speed of the fish is 12 mph in still water. Show all of your work and explain your solution.

algebra
The volume V of a gas varies inversely as the pressure P on it. If the volume is 250 cm3 under a pressure of 35 kg/cm3, solve for the pressure applied to have a volume of 180 cm3. Be sure to define your variables, find your constant variable, construct your variation equation...

Chemistry
Yes, sorry typo.

Chemistry
Show the steps needed to determine the energy in a red photon of 7.0 x 10^2 nm. E= h * (c/?) 6.62e-34 * (3e8/2e-7) 2.837e-19 J? Is this correct?

math
solve the following by a quadratic equation and then solving it. a rocket is projected vertically upwards from ground level, its height "h" meters after "t" seconds is given by the formula h=35t-5t^2 how long does it take to reach 50 meters? you should have...

maths
solve the following by a quadratic equation and then solving it. a rocket is projected vertically upwards from ground level, its height "h" meters after "t" seconds is given by the formula h=35t-5t^2 how long does it take to reach 50 meters? you should have...

maths
solve the following by a quadratic equation and then solving it. a rocket is projected vertically upwards from ground level, its height "h" meters. how long does it take to reach 50 meters? you should have two answers, explain the meaning of the two answers. thanks

Why do states require centers to be licensed?

Calc
Find a Cartesian equation for the curve and identify it. r=5cscx

Chemistry
Three bottles lost their labels. One contained an aqueous solution of HCl, another an aqueous solution of HNO3, and the third contained an aqueous solution of H2SO4. Write an experimental procedure that would allow you to correctly identify the contents of the bottles using ...

physics help
Some dragonflies splash down onto the surface of a lake to clean themselves. After this dunking, the dragonflies gain altitude, and then spin rapidly at about 1100 rpm to spray the water off their bodies. When the dragonflies do this "spin-dry," they tuck themselves...

physics help
i couldn't find the answer for part one still is wrong pls help You drive down the road at 39 m/s (88 mi/h) in a car whose tires have a radius of 34 cm. What is the period of rotation of the tires?2sf value/units Through what angle does a tire rotate in one second?2sf ...

physics help
You drive down the road at 39 m/s (88 mi/h) in a car whose tires have a radius of 34 cm. What is the period of rotation of the tires?2sf value/units Through what angle does a tire rotate in one second?2sf value/ units

Chemistry
Three bottles lost their labels. One contained an aqueous solution of HCl, another an aqueous solution of HNO3, and the third contained an aqueous solution of H2SO4. Write an experimental procedure that would allow you to correctly identify the contents of the bottles using ...

math
The perimeter of the base of the regular quadrilateral pyramid is P = 30 cm. Find the sum of all edges of this pyramid, if the perimeter of a lateral face is 27.5 cm

geometry
The side of one square is equal to 1m, and its diagonal is equal to the side of a second square. Find the diagonal of the second square.

Calculus
dT/dt = -kT-A I think not dT/dt = -k(T-A)

Calculus
dT/dt = -k (T-A) yes try T = A + (To - A) e^-kt then dT/dt = -k(To-A) e^-kt but T-A = (To-A)e^-kt so dT/dt = -k(T-A) it works so 85 = 30 + (90-30)e^-k(1) 55 = 60 e^-k ln(55/60) = -k solve for k then use that k 60 = 30 +60 e^-k t .5 = e^-kt ln .5 = -k t solve for t

Calculus
The temperature of a pan of hot water varies according to Newton's Law of Cooling: dT dt equals negative k times the quantity T minus A, where T is the water temperature, A is the room temperature, and k is a positive constant. If the water cools from 90Â°C to 85...

Calculus
The slope of the tangent line to a curve at any point (x, y) on the curve is x divided by y. What is the equation of the curve if (2, 1) is a point on the curve?

physics
a cylindrical storage tank has a radius of 1.05m. when filled to a height of 3.79m, it holds 13500kg of a liquid industrial solvent. what is the density?

chemistry
The oxidation number of sulphur in CuSO4.5H2O is ......

check statement

huh?
Problem statement makes no sense to me. The heavier it is the more I can lift?

physics
P V = n R T flexure warms rubber, P rises

Science
22.4 liters/mol CO2 = 12 + 16 + 16 = 44 grams/mol so (10/44)22.4 = 5.1 liters

Math
divide all by two to make it easier 2,3,4 law of cosines c^2 = a^2 + b^2 - 2 a b cos C 16 = 4 + 9 -2*2*3cos C 12 cos C = -3 cos C = -.25 C = 104.5 degees

Math
volume scales with cube of length 50*50*50 * .112 = 14,000

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