# Posts by abby

Total # Posts: 1,133

**Science**

Why does the water of lakes and oceans look alike?

**maths**

z = x-y+4 z = y-w-3 z = w-x+5 Based on the system of equations above, what is the value of z? a) 2 b) 3 c) 4 d) 6 e) 12

**economics**

they are economically inefficient

**math**

What you saying

**math**

Thank you I thought so

**Math**

A survey was made of 200 students to study their use of the public library system. The findings were as follows: 60 used the Reader’s Guide. 28 used both the card catalog and the information booth. 68 used the information booth. 83 did not use the library. 43 used only ...

**Chemistry**

Predict the effect of each of the following on the indicated equilibrium system in terms of which reaction will be favored (forward, reverse, or neither) H2(g)+Cl2(g)<=>2HCl(g) +184 kJ A)addition of Cl2 B)removal of HCl C)increased pressure D)decreased temperature E)...

**math**

Without graphing, identify the slope and the y-intercept. y = -4x + 5

**algebra**

Use the discriminant to determine how many real-number solutions the equation has. s2 - 5s + 6 = 0

**Geometry**

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**health**

List 3 components of the environment Briefly describe the major pollutant in each category and their effect on health Explain how sustainable development affects the environment

**health**

List 3 components of the environment Briefly describe the major pollutant in each category and their effect on health Explain how sustainable development affects the environment

**%%%%**

thanks dr bob!! I remember now!

**%%%%**

what is the formula for finding a percentage of a dollar amount??? ex. 30 % of 233 is ??? Please help me! Thanks!

**6th grade math**

40/100=4/10=2/5 a percent is over 100-then reduce

**Trig**

How do I solve this problem? tan (30° + x)

**Chemistry**

If one strand of DNA has the sequence AATCCGTAGCTC, what would be the sequence of its complementary strand?

**physics**

What is cice and Hfice on here?

**Calculus**

Use the given vector to find a vector b such that compab = 4. a = ‹4, 0, 1› ‹s, t, >

**Calculus**

At what points does the helix r = sin(t), cos(t), t intersect the sphere x^2 + y^ 2 + z^2 = 26? (Round your answers to three decimal places. Enter your answers from smallest to largest z-value.)

**Physics**

why is the second part incorrect

**Physics**

An oscillator with a mass of 520 g and a period of1.2 s has an amplitude that decreases by 2.20% during each complete oscillation. At what time will the energy be reduced to 15.0% of its initial value?

**Ag Bio**

I'm stuck on a few questions. If you can just answer what you can- 25. Describe the role of an operon in a prokaryotic cell, and give an example of how an operon works. 31. The word transcribe means "to write out," and the word translate means "to express in...

**Osciallations**

You pull a simple pendulum of length 0.237m to the side through an angle of 3.50 degrees and release it. How much time does it take the pendulum bob to reach its highest speed? Take free fall acceleration to be = 9.80 . How much time does it take if the pendulum is released at...

**Ag. Bio**

Last one, thanks for the help guys =) 34. Recall what happens in mitosis and meiosis. Describe how a given amount of a cell's DNA might be alike or different after each process was complete.

**Ag. Bio**

Been working on this forever... Thanks =) 33. A researcher identifies the nucleotide sequence AAC in a long strand of RNA inside a nucleus. In the genetic code, AAC codes for the amino acid asparagine. When that RNA becomes involved in protein synthesis, will asparagine ...

**Ag. Bio**

=) Thanks 32. How does the possible impact of a chromosomal mutation that occurs during meiosis differ from that of a similar event that occurs during mitosis?

**Ag. Bio**

This is the hardest question I can't figure out. Thanks =) 31. The word transcribe means "to write out," and the word translate means "to express in another language." Review the meanings of transcription and translation in genetics. How do the ...

**Ag. Biology**

I'm stuck on 10 questions on my homework, I'll post them separate. 25. Describe the role of an operon in a prokaryotic cell, and give an example of how an operon works.

**statistics**

The time to complete a standardized exam is approximately normal with a mean of 70 minutes and a standard deviation of 10 minutes. Using the 68-95-99.7 rule, if students are given 90 minutes to complete the exam, what percentage of students will not finish?

**Social Studies**

i need help on learning about jefferson davis

**Algebra**

121 and 144

**Chemistry**

I got answers for a and b but I don't know where to begin on c

**Chemistry**

For a I have .948 mol Li3N and for h20 I have 17.07848544 grams so now what do I do

**Language Arts 7th Grade**

yes actualy thank you! :)

**Language Arts 7th Grade**

I am doing a project on Percy Jackson and the Olympians: The Lightning Thief. I need to five 5 Hero's Journey Archetypes, but i can't seem to think of any except for 2 which are The Underworld and The Hero. I do not have my archetypes list with me so i am trying to do ...

**statistics**

Scores on a test have a mean of 66 and Q3 of 81. The scores have a distribution that is approximately normal. Find the standard deviation. Round your answer to the nearest tenth.

**CHEM**

The first excited state of the hydrogen atom is separated from the ground state by 10.2 eV. (a) At what wavelength does this occur and what is the energy difference in kJ mol-1

**Physics**

the ski boat is traveling at 15 m/s and the tension in the rope is 80 N. If the boat does 3500 J of work on the skier in 54.6 m, what is the angle between the tow rope and the center line of the boat?

**Physics**

Initially sliding with a speed of 2.3 m/s, a 2.0 kg block collides with a spring and compresses it 0.41 m before coming to rest. What is the force constant of the spring?

**Pre-Cal**

1) Use the half-angle formulas to determine the exact values of the sine, cosine, and tangent of the angle. 67 degrees 30'

**Pre-Cal(Please help)**

Approximate the equation's soultions in the interval (o, 2pi). If possible find the exact solutions. sin 2x sinx = cosx I do not know where to start.

**Pre-Cal**

Approximate the equation's soultions in the interval (o, 2pi). If possible find the exact solutions. sin 2x sinx = cosx I do not know where to start.

**physics**

79622?

**Physics**

Jill of the Jungle swings on a vine 7.0 m long. What is the tension in the vine if Jill, whose mass is 65 kg, is moving at 2.3 m/s when the vine is vertical?

**Physics**

When you take your 1200 kg car out for a spin, you go around a corner of radius 51 m with a speed of 12 m/s. The coefficient of static friction between the car and the road is 0.88. Assuming your car doesn't skid, what is the force exerted on it by static friction?

**MATH**

Elsie is starting a recycling club at her school and hopes to use the money earned from recycling cans to buy recycling bins for the school. Elsie first needs to figure out how much the cans that can be collected at her school will weigh, so she starts by weighing the cans in ...

**math**

The recycling center pays 25 cents per kg for aluminum cans. If her school recycles 2070 cans each day, how much money will Elsie earn each day by recycling?

**Pre-Cal**

1) My last question was wrong. The question should read: Fill in the blanks As x --> pi+, sin x --> ? and csc x --> ? I do not understand this!

**Pre-Cal**

Error. Im sorry the question is As x --> pi+, sin x --> ? and csc x --> ?

**Pre-Cal**

1) Fill in the blanks As x --> pi^2, sin x --> ? and csc x --> ? I do not understand this!

**Math(Please check)**

1) Use the cofunction identites to evaluate the expression without the aid of a calculator. cos^2 18 degrees + cos^2 72 degrees. Would I use the forumula cos(pi/2 - Q) = sin Q

**Math(Please check)**

Error

**Math(Please check)**

1) Use the cofunction identites to evaluate the expression without the aid of a calculator. cos^2 18 degrees + cos^2 72 degrees.

**chemistry**

What would be happening in this reaction? 2Ag^+(aq) + CO3^2-(aq) + HNO3 (aq) -----> 2AgNO3(s) + H20(l) + CO2(aq)

**chemistry**

Confused

**Pre-cal**

1) Solve the equation sinx(sinx+1) = 0 I am having trouble with the first step. Could I do sin x^2 + 1 =0?

**Physics**

A child goes down a playground slide with an acceleration of 1.24 m/s^2. Find the coefficient of kinetic friction between the child and the slide if the slide is inclined at an angle of 32.0 degrees below the horizontal.

**Physics**

A farm tractor tows a 3800-kg trailer up a 19 degrees incline with a steady speed of 3.0 m/s. What force does the tractor exert on the trailer? (Ignore friction.)

**Pre-Cal(Urgent!!)**

Find all the solutions of the equation in the interval (0,2pip) sin(x + pi/6) - sin(x -pi/6) = 1/2 I am only stuck on the last part. I have 2sinx(sqrt3/2) = 1/2 Does the 2 cancel out with the sqrt 3/2. I am not sure what to do.

**Pre-Cal**

Find all the solutions of the equation in the interval (0,2pip) sin(x + pi/6) - sin(x -pi/6) = 1/2 I am only stuck on the last part. I have 2sinx(sqrt3/2) = 1/2 Does the 2 cancel out with the sqrt 3/2. I am not sure what to do.

**Math**

1) Find the angle of depression from the top of a lighthouse 250 feet above water level to the water line of a ship 2 miles off shore. arc tan 10560/250 = 88.64 ft Is this correct? 2) A passenger is in an airplane flying at n altitude of 10 kilometers sees two towns directly ...

**Physics**

A swimmer runs horizontally off a diving board with a speed of 3.14 m/s and hits the water a horizontal distance of 2.16 m from the end of the board. How high above the water was the diving board?

**Physics**

A cork shoots out of a champagne bottle at an angle of 39.0 degrees above the horizontal. If the cork travels a horizontal distance of 1.10 m in 1.40 s, what was its initial speed?

**Physics**

A soccer ball is kicked with a speed of 9.80 m/s at an angle of 25.0 degrees above the horizontal. If the ball lands at the same level from which it was kicked, how long was it in the air?

**Physics**

In a friendly game of handball, you hit the ball essentially at ground level and send it toward the wall with a speed of 25 m/s at an angle of 39 degrees above the horizontal. (a) How long does it take for the ball to reach the wall if it is 3.7 m away? (b) How high is the ...

**Physics**

In a game of basketball, a forward makes a bounce pass to the center. The ball is thrown with an initial speed of 3.9 m/s at an angle of 25 degrees above the horizontal. It is released 0.75 m above the floor. What horizontal distance does the ball cover before bouncing?

**Pre-Cal(Please Help)**

1) For a person at rest, the velocity v (in liters per second) of air flow during a respiratory cycle is V = 0.85 sin pi(t)/ 3 where t is the time in seconds. (Inhalation occurs when v > 0 and exhalation occurs when v < 0) A) Find the time for one full respiratory cycle ...

**6th grade**

83%

**MAth**

yuhh know what im asking yuhh guys okayy! nd i know what iht is im not stupid!

**MAth**

what do you call a person who buys and sells bugs?

**Physics**

I need to solve this equation. 3E -9 N / 1.25 E -19 C I do not know what to do with the -9 and -19.

**social studies**

why was the Spanish-American War important to America?

**social studies**

Why was Theodore Roosevelt an American Hero?

**science**

What organ receives pancreatic juices? What organ absorbs water and what organ, in animals, helps digest cellulose?? Please help me!!

**Physics**

1) The question asked to find the ionosphere reading for your area today and gives you s web site. I went on the website but I have no idea how to find the reading for West Palm Beach. Any suggestions?

**7th grade**

2/5 of 40 What is the formula to find this????

**Science**

How is the pH of a strong acid compared to a weak acid of the same concentration?

**math**

a bank teller had $2750 in 10 dollar bills and5 dollar bills he had twice as many10 dollar billsas 5 dollar bills how many of each bill does he have

**english**

1. might be going 2.did give

**wrighting**

I have to wright a report on the erely explors and evrything i wright dous not make sence

**5th grade**

come up with some ideas first

**Ancient Rome**

How did Roman conquests overseas affected Rome's development in the past?

**science**

What are the seven energy levels and tell the maximum number of electrons that can fit in each.

**social**

what are two actions outlawed by the english bill of rights?

**social**

according the the english bill of rights, how is freedom of speech protected?

**History**

Comparing the different diplomacy styles of Prestidents Roosevelt, Taft, & Wilson, Roosevelt beheved the U.S. should respond to foreign crises, not by threats, but by military action, thus, the "big stick" approach. Taft hoped to modifty the American foreign policy ...

**History**

Compare the different diplomacy styles of Presidents Roosevelt, Taft, and Wilson.

**MATH**

Jones Company had 100 units in beginning inventory at a total cost of $10,000.The company purchased 200 units at a total cost of $26,000. At the end of the year, Jones had 80 units in ending inventory. Compute the cost of the ending inventory and the cost of goods sold under (...

**science**

A 2.7 kg box is released on a horizontal surface with an initial speed of 2.9 m/s. It moves on the surface with an acceleration of .27 m/s squared. Calculate the kinetic friction force on the box. The coefficent of the kinetic force is .156.

**math**

Over the past two weeks, Jane earned $292 and $193 respectively, at her part time job. What must she earn in the third week to bring her three-week average earnings to $200 per week?

**Science**

What is it caled when... A family of unreactive elements whose atoms do not gain, lose, or share valence electron

**world history**

true or false if false why hindus believe that souls are born and reborn many times each time into a new body which is a process called reincarnation

**history**

Why were American political leaders so interested in the Pacific islands in the late 1800's?

**5th grade**

the gcf can not be lower than 16

**chemistry**

in the lab of reaction with copper copper is suppose to loose mass because it oxidates. its that right or does it gain mass thanks

**chemistry**

when heated in the presence of air, 80 grms. of copper completely react to form 100 grms. of copper oxide what is the mass of oxygen that has combined with the copper? how much copper must be heated to form 300 grms. of copper oxide?

**math**

8 m _____________ |\ | 4 m | \ Garden| | \ | | floor \ | -------------- 8m I need help finding the area of the garden and the area of the floor. so please give me in full explanation.

**math**

8 m _____________ |\ | 4 m | \ Garden| | \ | | floor \ | -------------- 8m I need help finding the area of the garden and the area of the floor. so please give me in full explanation.

**math**

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 H E W S A E D A 17 18 19 20 21 22 G A