# Posts by annie

Total # Posts: 835

**physics **

A 13.0 gram sample of an unknown metal at 30.0*C is placed in a Styrofoam cup containing 50.0 grams of water at 90.0*C.The water cools down and the metal warms up until thermal equilibrium is achieved at 87.0*C.Assuming all the heat lost by the water is gained by the metal and...

**math**

What is the area of a quadrilateral ABCD, if AB = 5 cm, BC = 13 cm, CD = 9 cm, DA = 15 cm, AC = 12 cm?

**math**

Given: ABCD is a parallelogram AM , BN ? angle bisectors DM = 4 ft, MN = 3 ft Find: The perimeter of ABCD

**math**

A rhombus ABCD has AB = 10 and m?A = 60°. Find the lengths of the diagonals of ABCD.

**Rational number**

7/11, -8/6, -6/8, 9/4, 27/25 arrange the rational number in ascending order

**Maths**

sarika prepared squash from tomato,carrot,apple juices. 1/3 of the squash was tomato juice and 2/3 of the remainder was carrot juice. 315 ml of squash vs carrot juice. what volume of the squash was apple juice?

**Maths**

kuldeep had a sum of money. He saved 1/4 of it. He spent 4/9 of the remaining on suitcase. a) What fraction of his money sent on suitcase? b) What fraction of his money was left?

**Maths**

A cylinder has volume 12cm^3. What will be the volume of a cone with the same base area and perpendicular height?

**math**

Given: ABCD is a rhombus, AB = 6, and m?A=60° Find: The height.

**Math**

6.96×.33=2.30 8.24×3=24.72 24.72+2.30=27.02 The answer is $27.02

**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.

**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?

**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?

**math**

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

**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) ...

**math**

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

**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?

**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?

**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.

**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?

**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?

**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?

**Calculus AB**

Okay, thank you very much.

**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...

**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

**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?

**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?

**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...

**chemistry**

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

**Calculus AB**

Thank you so much! And I will

**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 ...

**science**

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

**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 ...

**Calculus AB**

Thank you so much :)

**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.

**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 ...

**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 ...

**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

**Calculus AB**

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

**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 ...

**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.

**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...

**Calculus AB**

OH okay thank you so much!

**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.

**Chemistry**

Thank you so much! I understand now.

**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

**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.

**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

**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?

**Science**

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

**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.

**American Government**

THANKS

**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

**Math**

How many fl oz would go pinto 6.5

**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 ...

**Social Studies**

Oh wait it's D.

**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 ...

**geography**

shopping malls interstate highway system oil deposits

**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 ...

**Social Studies**

Ms sue has major issues

**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.

**AP Biology**

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

**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?

**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! ...

**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 ...

**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

**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 <-----------------

**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?

**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...

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

THANK YOU STEVE!!!!!!

**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 ...

**Trigonometry and Right Triangles!**

Thank you Steve!

**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?

**Math Help!!!**

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

**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

**physics**

and I dividing the f/x or do I multiply

**physics**

F=24.9N?

**science**

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

**science**

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

**science**

find the energy of first excited state of helium

**math**

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

**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 ...

**Geometry**

(x)(x+10)=1200

**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 ...

**Math**

IDk

**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.

**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

**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 ...

**World Civilizations**

my little girl name is destiny

**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

**World Civilizations**

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

**World Civilizations**

Thank You for your help

**World Civilizations**

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

**Trig**

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

**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?

**Science**

Thank You

**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?

**Science**

Thank You

**Science**

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

**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?