# Posts by anonymous

Total # Posts: 108,989

math
q4

Pre-Calculus
correction cot(?/2-?)cos?

Pre-Calculus
That is indeed hard, someone help this man.

Pre-Calculus
explain how to do these with please. I was out a couple of days so give clear instructions. sin(?/2-?)sec? cot(?/2-x)cos?

math
If f(x) is an even function and passes through the point (5, 3), what other point must lie on the graph of the function? Explain your reasoning.

Math
. The volume of a rectangular box is given by the expression V = (120 ? 6w)w2, where w is measured in inches. a. What is a reasonable domain for the function in this situation? Express the domain as an inequality, in interval notation, and in set notation. b. Sketch a graph of...

American History-WWII US
My Apologies Ms. Sue, Thank you for the Configurations.

American History-WWII US
Sorry Ms. Sue, I think there is a misunderstanding, I know all the Neutrality Acts, However, I am unable to know how all these acts connect together as the laws continued on.

American History-WWII US
How do the Neutrality Acts of 1935, 37, and 39 become less Neutral?

calculus
can someone also help me ndertsand this question ; y=x^3 +2x^2+3 represents the rate of an object over the interval [7, 10]. What is the average rate of the object over the time interval?

calculus
can someone help me with this problem y=x^2 -9 represents the velocity of an object over the interval [1, 5] in meters per second. What is the displacement of the object over the time interval?

Algebra
One more than the product of one and a number xxx.

physics
A car moves in a straight line with constant acceleration. Starting from rest at t=0 it travels 8.0 m in 4.0 s. What is the speed of the car at t= 4 s. PLEASE explain :)

English composition
Write a debate on the against the motion men should help at the kitchen

value
ACAR OF MASS 1200KG TRAVEL OF SPEED OF 20M PERSECOND IF ITS ENGINE DEVELOPS INTO 3KW,FIND THE FORCE USED

Chemistry
ahh

math
A skydiver jumps from an airplane at an altitude of 2,500 ft. He falls under the force of gravity until he opens his parachute at an altitude of 1,000 ft. Approximately how long does the jumper fall before he opens his chute? h(t) = -16t2 + vt + h0 A. 2.4 s B. 9.7 s C. 12.5 s ...

physics
A car moves in a straight line with constant acceleration. Starting from rest at t=0 it travels 8.0 m in 4.0 s. What is the speed of the car at t= 4 s. PLEASE explain :)

Math
Can someone please help me understand box-and-whisker plots? I get really confused on what each thing is and how to plot it. Thanks.

physics
calculate angular momentum and rotational kinetic energy of earth about its own axis

Maths
AB is a line segment and M is its mid point. Semicircle are drawn with AM,MB and AB as diameters on the same side of line AB. A circle (O, r) is drawn so that it touches all 3 semi circles . prove that r=1/6 AB.

Maths
Show that the mid point of line joining points (-5,12) and (-1,-12) is a point of trisection of the line joining the points (-8,-5) and (7,10).

Math
47

Math
You have to form a right triangle where the top of the cliff to the boat is the hypotenuse. Then to find how far the boat is from the foot of the cliff, you do cos(26.2)=a/90. To find how far the boat is from the top of the cliff, you do sin(26.2)=90/b.

Math
From the top of a Cliff 90metre high, the angle of depression of a boat on the sea is 26.2 degree.calculate how far the boat is from the from the foot of the cliff and from the top of the cliff

Statistics
Assume that the mean systolic blood pressure of normal adults is 120 millimeters of mercury (mm Hg) and the standard deviation is 5.6. Assume the variable is normally distributed. If an individual is selected, find the probability that the individual's pressure will be ...

health
The goal of health/safety education is...

A note played by a musical instrument has a frequency of 130.8 Hz. What would be the length of the pipe if an organ pipe had this frequency as the fundamental and if the speed of the sound in the pipe is 350 m/s? f = v/2L 130.8(2L) = 350 2L = 2.68 L is about 1.34 m.

math
four times a number minus 8 is equal to two times the number plus 12

Math
Sorry It actually did

Math

Math
Prove 3(x+1)(x+7)-(2x+5)² is never positive So, 3(x+1)(x+7)-(2x+5)(2x+5) =3(x²+8x+7)-(4x²+20x+25) =3x²+24x+21-4x²-20x-25 =-x²+4x-4

math
8 kilometer is how many meters

Economics
An article in The Wall Street Journal discusses a trend among some large U.S. corporations to base the compensation of outside members of their boards of directors partly on the performance of the corporation. “This growing practice more closely aligns the director to the...

Managerial Economics
An article in The Wall Street Journal discusses a trend among some large U.S. corporations to base the compensation of outside members of their boards of directors partly on the performance of the corporation. “This growing practice more closely aligns the director to the...

Physcis 1315
h=v?t+gt²/2, v=12 t=1 g=9.9

Physcis 1315
A ball is thrown vertically downward with a velocity of 12m/s How far has the ball fallen 1 s later?. 2s later?

math
Ann has \$300 in a savings account that earns 1.75% simple annual interest. in how many years will she have\$21 in Interest?

Physics
The angle between two vectors (F? and F?) is 90-28=62° The second angle of the force parallelogram is (360 -2•62)/2= 118°. Cosine law gives F=sqrt (F?² +F?² -F?•F?•cos118°)= 9.2 tan ? = (5+5.9•sin28°)/5.9•cos28° =1.49 ? = ...

Chem
Water was decomposed by the following reactions. Calculate the mass of HCl produced from 50.0 mL water assuming the following yields H2O=H2+O2 90% H2+Cl2=HCl

Chem
I need to do this using dimensional analysis

Chem
what mass of ammonia nh3 is necessary to react with 2.1 x 10^24 molecules of oxygen when ammonia reacts with oxygen to form water and nitrogen dioxide

Math
1. x+y = 9 2xy=40 x=9-y 2(9-y)y=40 y²-9y+20=0 y= 9/2 ±sqrt(81/4 – 20) y?=5, y? =4 => x?= 4, x?=5 2. x-y=4 x²+y² =208 x=4+y, (4+y)² + y² =208, y²+4y-96=0 y= - 2±sqrt(4+96) y?=8, x?= 12 , y? = -12 ( this root doesn’t meet ...

physic
The angular velocity is ?=v/R, the frequency is f= ?/2? the centripetal force is F=mv²/R

Physics
Work=Heat - internal energy W=A-U

PHYSICS
-------------a ....../1\..... ...../ 1 \.... B C

PHYSICS
--------------A /l\ / 1 \ / 1 \ / 1 \ 1 B C the pendulum has a string of .075m. velocity at c is 3.83m/s how do i find the speed at point b when the angle of B and C is 37 degree

*physics*
what is the smallest time in which a 9.00kW motor can lift a 3500 kg elevator to a height of 9.50m? use 10m/s^2 as g.

Physics
A car accelerates a form an initial speed to higher final sped while the engine puts out constant power. During this time period, magnitude of the car's acceleration was .. a increasing b decresing c constant d unpredictable please explain why also.

English
What did sodhi think of goeff

n
A ferris wheel is 20 meters in diameter and boarded from a platform that is 1 meters above the ground. The six o'clock position on the ferris wheel is level with the loading platform. The wheel completes 1 full revolution in 6 minutes. The function h = f(t) gives your ...

Math
What is 7/3?

math
An open box is to be made from a square piece of material by cutting four-centimeter squares from each corner and turning up the sides (see figure). The volume of the finished box is to be 576 cubic centimeters. Find the size of the original piece of material.

physics
How much heat energy must be added to a 3.0 cm × 3.0 cm × 3.0 cm block of aluminum to raise its temperature from -50?C to 50?C?

Algebra
In an infinite geometric progression with positive terms and with a common ratio |r|<1, the sum of the first three terms is (26/3) and the sum of the entire progression is 9. Determine the progression. Find the first term and common ratio

Algebra
Find the sum of the first five terms of an infinite geometric progression with a common ratio |r|<1 if the second term is (4/3) and the ratio of the sum of the squares of the terms of the progression to the sum of the terms of the progression is 3:1.

social studys
How did thjis all begin

math
What is the side length of the smallest square plate on which a 26?-cm chopstick can fit along a diagonal without any? overhang?

Science
1.A 2.B

Science
I meant burn

Science
although electromagnetic waves differ in the wavelengths they all travel at the speed of light which is A.300,00km/s B.6000km/h c.100km/s d.10,00km/s A rocket is a motor that can urn fuel without requiring A.water B.air c.electricity d.fire

Health
What are some ways to stay awake during studying for tests at night?

cience
Henry was given this cool toy for his birthday; he can use it to tell how fast someone is moving at that moment in time. The toy must calculate the person's

Algebra II
Determine if the binomial is a perfect square binomial. If so, show the original monomial squared. X^2 + 16 X^2 + 4

Math/Chemistry
ln(Ao/A)=kt => (Ao/A)=e^kt => Ao/e^kt=A => A=Aoe^-kt (1st order integrated rate law)

Math/Chemistry
This is from the 1st order integrated rate law => A = Aoe^-kt solve for Ao = A/e^-kt =Ae^kt (I showed solution for A in earlier post from (ln) function.)

Chemistry
Based on data given, Rate = k[NO2][F2]^1.2 Pick any row and substitute concentration and rate values. Solve for k. I got 115.4 M^-1.s^-1

Algebra II
Find the perfect square binomial x^2 + 16 Answer: x^2 + 4

Social Studies

Social Studies
Thanks Ms.Sue

Social Studies
In Chinese society, merchant class ranked below the 1. farmers and aristocrats 2. landowners and traders 3. aristocrats and priests ****** 4. bankers and farmers Please check my answer

science
Thank You Cassandra. I made a 100 on my test .

science
The Sun is unusual because it does not belong to a ____ ? A) solar system B) universe C) galaxy D) binary star system I think the answer is D but I'm not 100% positive.

I need answer for this question

Social Studies nhf
Thank you to anyone who answers this! I know it is long, but I want to make sure and positive that it is corect!

Social Studies nhf
The Two systems that move your body are the skeletal and the muscular systems. Muscles connect to your skeleton and they contract and move the skeleton along.

Social Studies nhf
Thank you! BTW, nhf stands for need help fast :) thank you again in advance!! All right! So, I have a few essay questions I want to make sure are right! This is really important to me and I am not that good in science. Please help me!! Here goes everything! (6 points) 1. ...

What three products are columbia famous for???? 1.Beef, candy, sapphires 2. Tea, perfume and diamonds * or 3. cofee, flowers and emeralds *

Social Studies
For the quiz: A, D, A, C, C, C, A, C, C, D Hope this helps

Social Studies
For the quiz

chemistry
You need the Kb value for Ammonium Hydroxide to complete the problem. Kb(NH4OH) = 1.8 x 10^-5 Calculate the Ka for NH4^+ Hydrolysis reaction = Kw/Kb Set equal to the hydrolysis Ka expression for ... NH4^+ + HOH <=> NH4OH + H^+ C(eq) 0.10 - x x Ka =[NH^4OH][H^+]/[NH4...

Maths
Co ordinates of a point which isbat+3 diatancecfrom points(1,-3) of line 2x+3y+7=0 ?

Math
Thehe sum of the ages of Dorothy and Darlene is 41. In 5 years, Dorothy will be twice as old as Darlene. Find their ages 3 years ago.

physics
Well, perhaps that is the force the ball exerts on your hand?

Math derivatives
Develop a rule for the following: Dx[f(x)g(x)/h(x)]

Math - Derivatives
Find all points on the graph of y=1/4x^4+2/3x^3-5/2x^2+6x+7 where the slop of the tangent lins is 12.

Physics
A boat starting on one side of the river heads to the south with a speed of 1.5 m/s, the river flows to the east at .8 m/s. What is the resultant velocity to the side of the river? And if the river is 50 m wide calculate the displacement of the boat

fractions
I have 12 cookies I ate 3 how would I write what I ate in a fraction

Math
put a number into h and solve for v ex: h V 0 288 1 276 2 264 and so on.

Social Studies
Hello??

Social Studies
I pick number 3 am I right?

Social Studies
In Chinese society, the merchant class ranked below the 1. farmers and aristocrats 2. landowners and traders*** 3. aristocrats and priests 4. bankers and farmers Can someone please check my answer?

math
56/60 to get mile per min. 56/60*45 to get miles traveled in 45 min. 50/60/60 to get mile per sec 50/60/60*45 to get miles traveled in 45 sec. add the amount of 45 min and sec together to get final answer.

math
A car travels at a constant speed of 56 miles per hour. How far will it travel in 45 minutes and 45 seconds?

Math
i don't think you gave enough information.

Math
Travis is 19 years older than his sister Linda. In 4 years, he will be twice as old as Linda. How old is each of them now?

physics
i mean i got C

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