# Posts by Annie

Total # Posts: 821

**math**

It takes a ship 3 hours to cover 72 km with the current and 4 hours against the current. Find the speed of the ship in still water and the speed of the current.

*March 19, 2017*

**math**

A motorboat covers the distance from one pier to the other pier in 4 hours and the way back in 5 hours. What is the speed of the boat in still water, if it covers 70 km with the current in 3.5 hours?

*March 17, 2017*

**math**

Two shelves contain 55 books. If half of the books from the second shelf were relocated to the first shelf, then the first shelf would contain 4 times more books than the second one. How many books are there on each shelf?

*March 17, 2017*

**math**

The sum of two numbers is equal to 63 and their difference is equal to 12. Find the numbers.

*March 17, 2017*

**Algebra 2**

Amelia is documenting the height of sunflower plants each week. She has determined the function to be f(x) = 3x + 3, where x represents time and f(x) represents the height of the plant. Which of the following options describes the restrictions to the domain (x) and range f(x) ...

*March 4, 2017*

**math**

A diagonal of a parallelogram forms 25° and 35° angles with the sides of a parallelogram. Find the angles of the parallelogram.

*February 20, 2017*

**math**

In a class, every student knows French or German (or both). 15 students know French, and 17 students know German What is the smallest possible number of students in that class?

*February 11, 2017*

**math**

An old lady has 125 cats. Seven of them are old, 9 of them are her favorite, 5 of them are both (old and favorite). How many of them are neither old nor favorite?

*February 11, 2017*

**Algebra With Pizzazz**

I missed a week of school and I know nothing. Next thing I know we get page 163 and have to do everything on it. I don't know anything it's on System of equations substitutinal method.

*February 9, 2017*

**Algebra**

The value of a new car decreases by 35% in the first year. If a car costs $9,800 when new, how much less would it be worth at the end of the first year?

*February 7, 2017*

**Chemistry **

its takes 145 mL of zinc nitrate to react completely with 175 ml of 1.5 M potassium hydroxide. what is the concentration if zinc nitrate?

*February 3, 2017*

**Calculus AB**

What's the lim(x-->-infinity) sqrt(x^4-1)/(x^3-1)? I've tried solving for it but I got -1/0, which would make it undefined. Is that correct?

*January 31, 2017*

**Calculus AB**

Okay, thank you very much.

*January 30, 2017*

**Calculus AB**

So the problem is "For x>0, d(lnx)/dx = 1/x and lne=1. A) find the tangent line approximation for ln 3 B) calculate the %error in approximation in part A. My teacher said the answer for part A is that 1/e, and I'm pretty confused. So far I the given info into point...

*January 30, 2017*

**math2**

When s is measured in meters and t is measured in seconds, find the velocity at t = 2 of the following a. s = t^2 + 3t b. s = t^3 - 3t^2 c. s = squareroot t + 2 Help plz

*January 29, 2017*

**science(physics)**

Why a minibus is more likely to topple over when the roof rack is heavily loaded than when the roof rack is empty?

*January 17, 2017*

**Math**

The population of a city has been decreasing exponentially since 1990. In 1990, the population was 1,000,000. In 2010, the population was 560,000. If t represents time in years since 1990, which of the following equations best models the decay of the population?

*January 2, 2017*

**Calculus AB**

Please help me with this WS 1) Find the value of lim as x-->-(square root of 3) of (-x^4 + 5x^2 -6)/(x+(square root of 3) 2) Find the distance between the discontinuities of g(x)= ((square root of x-4))/(x^2 -5x -1) 3)Find the value of x at which the curve y=(x^2 - 4)/(x^5...

*November 30, 2016*

**chemistry**

Write a balanced equation for the reaction of liquid bromine with chlorine gas.

*November 29, 2016*

**Calculus AB**

Thank you so much! And I will

*November 25, 2016*

**Calculus AB**

Could someone please help me with these tangent line problems? 1) Find the equation of the line tangent to the given curve at the indicated point: 3y^3 + 2x^2 = 5 at a point in the first quadrant where y=1. 2) Show that there is no point on the graph of x^2 - 3xy + y^2 = 1 ...

*November 25, 2016*

**science**

a body of mass 10kg is moved in a vertical circle calculate tangential acceleration

*November 11, 2016*

**Chemistry**

Write mathematical equations that show how you will calculate the detected activity from the count rate due to background radiation and the sample of KCl and how you will determine the “true” activity of your sample from the detected activity. Use the following ...

*November 10, 2016*

**Calculus AB**

Thank you so much :)

*November 9, 2016*

**Calculus AB**

I'm not sure how to go about this problem: Find the equation of the line tangent to the curve x^2 + 2xy + y^3 = 4 at y=1 in the 1st quadrant.

*November 9, 2016*

**Calculus AB**

There's these two word problems I don't understand. 1. A man 6 ft tall walks at a rate of 5 ft per second toward a streetlight that is 30 feet high. The man's 3-foot-tall child follows at the same speed, but 10 feet behind the man. a) Suppose the man is 90 feet ...

*November 8, 2016*

**Chemistry**

To treat a burn on your hand, you decide to place an ice cube on the burned skin. The mass of the ice cube is 18.5 g, and its initial temperature is -13.3 °C. The water resulting from the melted ice reaches the temperature of your skin, 28.4 °C. How much heat is ...

*November 4, 2016*

**English Lit**

1. What pattern or structure is there to the development the the plot? Describe the way the events are organized. Is the structure significant to the meaning? "Car Crash While Hitchhiking" -Denis Johnson

*November 2, 2016*

**Calculus AB**

Thank you so much! These were the hardest out of the 53 problems.

*October 30, 2016*

**Calculus AB**

Um I don't really understand these word problems so could someone help me please? 1) An object is thrown upward with an initial velocity of 5 m/s from an initial height of 40 m. Find the velocity of the object when it hits the ground. Assume that the acceleration of ...

*October 30, 2016*

**Calculus AB**

Thank you so much. I kind of understand the chain rule and product rule, but it's always hard for me to determine how to do/use them.

*October 30, 2016*

**Calculus AB**

Sorry but I've got a lot of problems that I don't understand. 1) Let f(x)= (3x-1)e^x. For which value of x is the slope of the tangent line to f positive? Negative? Zero? 2) Find an equation of the tangent line to the oven curve at the specified point. Sketch the curve...

*October 30, 2016*

**Calculus AB**

OH okay thank you so much!

*October 30, 2016*

**Calculus AB**

Could someone please help me with this? Calculate the instantaneous rate of change of f <note: f(x)=(x-6)/(x+6)> at x=6.

*October 30, 2016*

**Chemistry**

Thank you so much! I understand now.

*October 28, 2016*

**Chemistry**

Please write down the redox reactions (using the half-reaction method!) a)Cl2 from OCl- and Cl- in acidic solution b)Br2 from BrO3- and Br- in acidic solution -You don't have to do both, but could you help me step up the half reactions especially for OCl- --> Cl2

*October 28, 2016*

**Social Studies**

I think you can use the index in your textbook to look this up. It is important you use what your school is teaching you because information is different depending on where you look.

*October 25, 2016*

**Algebra**

solve for the negative value of x: I know if you solve for a positive value, the answer for x=13; but how to get the negative value. |2x-8|=18

*October 23, 2016*

**math**

a recipe for fudge brownies calls for 3 5/8 cups of cocoa per bath. if you are making 2 1/2 batches, how many cups are needed?

*October 18, 2016*

**Science**

Mom: circle (C) Dad: oval (c)

*October 14, 2016*

**Science**

Mom:Circke face Dad: Oval face Son: ? what's the son genotype & phenotype? may someone give me an example and help me under this question, please.

*October 14, 2016*

**math**

Of 45 students 30 play badminton and 26 play tennis. Each student play either badminton or tennis,determine how many students play:(a)badminton only (b) tennis only

*September 30, 2016*

**Math**

How many fl oz would go pinto 6.5

*September 28, 2016*

**Calculus AB**

Please help I'm stuck on this problem for the past hour. Define f(x)= { Ln lx-1l }/x A) show that f(c) is continuous at x=2 B)Where on the interval [-2,2] is f discontinuous? Show the work that leads to your conclusion. C) classify the discontinuities in part b) as ...

*September 15, 2016*

**Social Studies**

Oh wait it's D.

*September 8, 2016*

**Social Studies**

Which of the following was the provision in the Treaty of Paris in 1763? a. All French land in North America was to be given to England b. All French land in North America was to be given to Spain c. All French lands west of the Mississippi and Louisiana were to be given to ...

*September 8, 2016*

**geography**

shopping malls interstate highway system oil deposits

*September 8, 2016*

**Language Arts**

Which of the following topics would be most appropriate for an autobiography narrative? A. your opinion of the opening ceremony at the Olympic Games B. your explanation of how to download MP3 files to your personal musical device C. your account of your audition for a ...

*September 7, 2016*

**AP Biology**

Not to be rude, but none of them answer my question for the phenotypes of the cusimanse, or it's body structure and function from out and within.

*August 6, 2016*

**AP Biology**

What are the phenotypes of the long-nosed cusimanse? I can't find any site about their body structure or function either.

*August 6, 2016*

**Chemistry**

If you are asked to make exactly 1.0 Liter of 0.80 M ZnCl2 solution, how many grams of zinc chloride would you need to be massed out? How do I go about solving this problem?

*July 13, 2016*

**English**

Read the following poem and then respond to the question below: “I’m Nobody! Who are you?” By Emily Dickinson I’m Nobody! Who are you? Are you – Nobody – too? Then there’s a pair of us! Don’t tell! they’d advertise – you know! ...

*June 7, 2016*

**Psychological**

hello

*May 30, 2016*

**Psychological**

Which of the following statements regarding the nature of stress is true? A. Accumulating hassles may well lead to a sudden onset of PTSD. B. Psychophysiological disorders are primarily mental disorders. C. Continued exposure to stress is associated with the secretion of ...

*May 30, 2016*

**Math**

For questions 3 and 4, simplify each expression. 1. 4^4/4^6 -16 16 1/16 <----------------- -1/16 2. 5^0 0 <------------- 5 1 –5

*May 30, 2016*

**Math**

Write each expression using a single exponent 1. x^9/x^2 a)x^11 b)x^7 <-------------- c)7 d)x^5 2. h^14/h^5 a)h^-9 b)1/h^9 c)h^19 d)h^9 <-----------------

*May 30, 2016*

**physics**

An insulated beaker contains 300g of water initially at 30 degree celsius. water at 100 degree celsius is added until the temperature of mixture reaches 50 degree celsius . the specific heat capacity of water is 4.2J/(kg degree celsius). how much water is added?

*May 22, 2016*

**Algebra**

A chemist mixed a 70% alcohol solution with a 30% alcohol solution to make a 45% alcohol solution. How many liters of each were used to make 120 L of a 45% solution? I tried solving this with elimination method and made two separate equations. For instance, x+y = 120(.45) .70x...

*May 20, 2016*

**Math Help- Areas!!!!**

THANK YOU STEVE!!!!!!

*May 19, 2016*

**Math Help- Areas!!!!**

For problems 4-5, find the surface area of the cylinder in terms of pi. (cylinder is 18 cm high and 14 cm wide) A. 350 pi cm2 B. 896 pi cm2 C. 602 cm2 D. 644 pi cm2***? (cylinder is 20 inches high and 18 inches wide) A. 396 pi in2 B. 522 pi in2 C. 360 pi in2****? D. 1008 pi ...

*May 19, 2016*

**Trigonometry and Right Triangles!**

Thank you Steve!

*May 8, 2016*

**Trigonometry and Right Triangles!**

The length of the hypotenuse of a 30 60 90 triangle is 16. What is the perimeter? I'm just learning about this. Can someone explain?

*May 8, 2016*

**Math Help!!!**

How do I solve for sin24=CD/BC if BC is 15,052.07464? Thanks!

*May 7, 2016*

**physics**

on the road with Kate. If she is driving a 2500kg car going 75km/h a)how much kinetic energy will it process. b)She asks "How high would I have to lift the car for the same amount of potential energy"? converting 75km/h to m/s

*May 4, 2016*

**physics**

and I dividing the f/x or do I multiply

*May 4, 2016*

**physics**

F=24.9N?

*May 4, 2016*

**science**

The cohrence length of a light source is 2.45×10raise to power-2 calculate width of spectral line

*April 22, 2016*

**science**

write down the possible terms of one electron system corresponding to n=2

*April 22, 2016*

**science**

find the energy of first excited state of helium

*April 22, 2016*

**math**

Write the following sets in set. Builder notation. B is the set of even natural numbers greater than 15 and smaller than 29

*April 17, 2016*

**Please help me out**

What Ring size would an 48 year old wear? I'm trying to find a gift for my boyfriend . he is 48, but I don't know what is his size . I don't have time to get his finger measured by a pro but maybe I can? Please don't Respond with just go to a jeweler. Also do ...

*March 31, 2016*

**Geometry**

(x)(x+10)=1200

*March 31, 2016*

**history**

The Ming dynasty emperors were members of the Zhu family. .... Hong Wu did continue to conduct limited trade with merchants for ... the fault of the eunuchs— also contributed to the decline of the Ming Dynasty. .... They were able to enlist Ming government officials and ...

*March 30, 2016*

**Math**

Wendy's savings to Stef's savings were 5:6. After they spent $28 each, then the ratio became 1:4. A) Find Wendy's saving before spent $28. B) What's Stef's saving after spent $28.

*January 27, 2016*

**Physics**

A shaft is turning at 71.6rad/s at time zero. Thereafter, its angular acceleration is given by α = –10.8rad/s2 – 4.42 t rad/s3 where t is the elapsed time. Calculate its angular speed at t = 2.73s. and How far does it turn in these 2.73s

*January 26, 2016*

**Math/ algebra**

Cheryl decided to create a flower bed in front of her house. One half of her flower bed is planted with pink tulips. She plants three-quarters of the rest of the ground with purple iris. After that she plants one half of what remains with orange marigolds. The rest of the ...

*January 17, 2016*

**World Civilizations**

my little girl name is destiny

*January 2, 2016*

**World Civilizations**

I'm trying to help my little girl but i really don't understand this stuffs at all if you can please help my little girl out here is her email address at please i give up on helping her out

*January 2, 2016*

**World Civilizations**

i really do understand this still its getting me upset :(

*January 2, 2016*

**World Civilizations**

Thank You for your help

*January 2, 2016*

**World Civilizations**

Why did northern European powers enter the competition for the New World land and resources in the 17th century? need help please

*January 2, 2016*

**Trig**

Could you explain the (50-v/2)^2 + 3/4v^2 = 100^2 part? I'm a little confused.

*December 7, 2015*

**Trig**

In still air, an airplane is flying at 100 mph. It encounters a wind blowing toward the west at 50 mph. What should be the plane's compass heading for its course to be N30ºW?

*December 7, 2015*

**Science**

Thank You

*November 12, 2015*

**Science**

If you were creating a lamp by hand what type of material would you chose for the wiring and what material would you chose to coat the wiring? Why?

*November 12, 2015*

**Science**

Thank You

*November 12, 2015*

**Science**

What must happen to the electrons in a material to create an electric current?

*November 12, 2015*

**Science**

An electric fence displays a warning sign about the voltage and amperage of the fence. How would amperage and voltage affect the power of the fence?

*November 12, 2015*

**Math**

Write the following equation in slope intercept form 3x + 4y = 12

*November 10, 2015*

**Math**

2. Find the slope of (3, 4) (6, -2)

*November 10, 2015*

**Math**

1. What is the domain and range for these two ordered pairs? (3, 4) (6, -2) Domain and Range.

*November 10, 2015*

**Physics**

An experimental model rocket has a mass of 0.054kg. The fuel that was used in one test had 215J of chemical potential energy. When the rocket reached an altitude of 119m, it was travelling at 48m/s and still rising. With what efficiency did the rocket convert chemical ...

*November 9, 2015*

**Math algebra 2**

Identify the vertex the axis of symmetry,the maximum, or minimum value and the range of each parabola Y=x^2-4x+1

*November 2, 2015*

**Math**

A man walks 3 miles due east, then 4 miles due north, then five miles due east. How far is he from his starting point?

*October 25, 2015*

**math**

Casey got 94 got of the 100 questions answered correctly how many percent of the questions did she answer correctly

*October 21, 2015*

**algebra**

Hi! Have a good day.

*October 19, 2015*

**present participle or past participle**

1. the baking bread looked delicious. 2. devoted soccer fans are looking forward to the season. 3. frozen blue berries are his favourite desert. 4. walking slowly the dog stretched his legs. 5. examined by a doctor, his wound will heal soon

*October 12, 2015*

**present and past perticiple**

The lion basking in the sun looked sleepy

*October 12, 2015*

**English**

I need a real life example of something that illustrates these qualities from "How to Read Literature Like a Professor?" by Thomas C. Foster I am doing a chapter from the book called Nice to Eat You: Acts of Vampires Basically this is what I got from the chapter : 1....

*October 9, 2015*