# Posts by Anna

Total # Posts: 2,672

**Trigonometry**

What is the smallest positive value of x that satisfies x= Arc cos 1/2

**Trigonometry**

For all values of x for which the expressions are defined, prove the following equation identity 2/sec = 2-2 sin^2 x/ cos x

**English**

PismoBeachGirl is 100% correct

**math**

Thomas has a letter he wants to send to his girlfriend. the total perimeter of the blue stamp and envelop is 50 cm. the ratio between them is 1:4. What is the perimeter of the stamp? So I know that I need to let x be the width of the stamp and the width of the envelope be 4x. ...

**Science**

B C B A These are 100% answers. I swear to God.

**Social studies**

It's B I do believe.

**Math**

Let P be the point (0,-1) and Q be the point (3,2). In this Cartesian coordinate system, find the point on the line segment PQ that is twice as far from P as from Q. Please help, I need this for a test and i have totally forgotten the formula and notes and how to do anything ...

**math**

Thanks Steve

**math**

In Mrs.Marshall's classroom, 6/7 of the students play sports. Of the students who play sports, 4/5 also play an instrument. If there are 35 in her class how many play sports and an instrument?

**Health**

yes i believe it is c

**math**

witch benchmark fraction could you use to estimate the product of 36 times 11/16

**physics**

Assumed that north is the y-direction and east the x-direction. You are piloting the boat that moves at a constant speed of 10 km/hr relative to the water beneath it. 1) On a body of still water, you point your boat due north for 2hr, then turn due east and continue for ...

**physics**

Also time = 3/cos45 not 30

**physics**

is hi equal to zero?

**physics**

A projectile is launched from ground level at an angle of 45 degrees above the horizontal with a speed of 40m/s. It is aimed straight towards a high wall that is a horizontal distance of 120m away from the launch point. a) How much time will the projectile spend in the air ...

**Physics**

A solid disk rotates in the horizontal plane at an angular velocity of 0.0684 rad/s with respect to an axis perpendicular to the disk at its center. The moment of inertia of the disk is 0.190 kg·m2. From above, sand is dropped straight down onto this rotating disk, so ...

**Social Studies**

All are correct :) I got the first one wrong from my answers, so thanks for the help.

**Algebra**

Your answer would be -1, because you are subtracting 8 from 7. so it is D.

**Algebra**

Your answer would be -1, because you are subtracting 8 from 7.

**History**

Wait no I think it's Ireland. Is that correct?

**History**

Famine caused people from which country to immigrate to the U.S.? A. Britain B. Ireland C. Spain D. Germany***

**History**

Thanks! :)

**History**

By 1860 the Midwest and the East were united by a network of A. Roads B. Railroad tracks*** C. Canals D. Steam-powered ships Am I correct? :)

**Math final exams**

Hi, my name is Anna. In a month we are taking final exams. What can i do to prepare and study?

**Studing math.**

Hi. I got a question. I am almost about to take the state test(AZmerit) I feel worried. What may i do? I am in the fourth grade.

**Math**

21 and 3

**qusestion**

that right alexiss

**qusestion**

how can i be like you guys ? because i wanted to help kids with here homework.

**Philosophy**

Does "identical" mean SameShape or SameSize in Tarski's World?

**Philosophy**

exercise 5.8 write an informal proof of Premises: LeftOf(a,b) | RightOf(a,b) BackOf(a,b) | ~Leftof(a,b) FrontOf(b,a) | ~RightOf(a,b) SameCol(c,a) & SameRow(c,b) conclusion BackOf(a,b) State if you use proof by cases.

**Algebra**

The amount of money you earn mowing lawns at $15 per lawn? A=$1.50+$.80

**Math please help urgent!!**

2. If m<1=43, what is m <4? 53 43****** 37 27 3. If m <1=43, what is m <5? 50**** 40 35 25 <=the angle sign Unfortunately i can not link the graph. But it is horizontal and a vertical crossing line then a diagonal line drawn through each right angle mke by the ...

**Physics**

What release height would be required for a 5 micrometer spherical spore to drift from africa to south america (distance =3200km)? assume spore density is 1.2. assume steady 6m/sec horizontal wind from africa to s.america.

**Math**

Okay. in fact i do have an acount on khan academy! thank you mrs. Sue, Anna

**Math**

I need help with basic multiplication. I do not really understand it from the two times table to the twelfth times table. Can you help me?

**Social Studies-Please Help**

I'm pretty sure the answer is China.

**Math**

Sorry, I'm confused. Why?

**Math**

Chaz is a college student. He has a checking out balance of -$52.00. His roommate Will's checking out balance is -$59.25. Chaz thinks that Will owes more to the bank than Chaz does. Is Chaz correct?

**Geography**

Thanks "anon" I got a 100% I had gotten the answer before wrong.

**I NEED HELP WITH THIS. PLZ**

I got them all right, too. Thank you so much for the help ;) MoL/ANNON, let me know if you can help me out with some more problems.

**English**

Yes but i totally forgot about it.

**Math**

On an airplane there are two seats on the left side in each row and three seats on the right side. There are 150 seats altogether. Can someone help me?!

**Social studies**

I think it's D.

**English**

1. c 2. d 3. b 4. d 5. c 6. c 7. d 8. c 9. a 10. b 11. c 12. c 13. a 14. a 15. b 16. d i just took it, here are the answers. 100% correct

**Chemistry**

What happens if we add 200 mg of calcium hydroxide in 100 g of water at 20 ° C?

**global studies**

Te answer is Atolls.

**Chemistry**

Is it possible to separate Bi, Cu and Ag from a mixture containing: c(BiO+)=0,08M c(Cu2+)=0,242M c(Ag)=0,106M c(HClO4)=1M Eo Bi = 0,32 V, Eo Cu = 0,337 V, Eo = 0,792 V _______________ Using Nernst equation (E=E°-0,0592/n -logQ) i see it's possible to separate Ag, but ...

**physics momentum**

a trolley of mass 200kg is travelling north at 2m\s. It collides head on with a second trolley of mass 500kg which is travelling south with a velocity of 5 m\s and they remain coupled together. a)calculate the velocity of the two trolleys after collision. b)what is the ...

**Math**

I still don't know the answer to this. Was the answer 16? I thought it was 9;.

**ART 4 QUESTIONS PLZ HELP ASAP**

Thanks so much, Sid. I got 4/4 too.. I barely understand this concept, so thanks a lot =)

**LA**

WOW, juice. Apparently you don't have a sense of humor, or know how to take a joke. We all know its the teacher job to grade the students mind, not their paper. But that's not the way things work. Honestly, your just being a hater, your taking a look at a situation you...

**English**

Identify What do you learn about Maya and the conflict she faces in lines 1–14?

**Chemistry**

Calculate pH and concentration of H2SO3, H2SO3- and SO32- in NaHSO3 c=0,05M. Ka1= 1,23*10^(-2) Ka2= 6,6*10^(-8) Results attached are: a) [H2SO3]= 1,04x10-4 M, [SO32-]=1,3x10-4 M, [HSO3-]= 0,05 M but i keep getting different numbers.

**Chemistry**

Enter the formulae of the products and give their states. Type your answer using the format Na2SO4(aq) for Na2SO4(aq). Do not balance the equation. If there are no products, enter "none". ZnCO3(s) + heat ---> I know it's a decomposition reaction, so I thought ...

**Social Studies**

Maybe gun laws would help.

**English**

Thanks

**physics**

An object of mass m attached to a spring of force constant k oscillates with simple harmonic motion. The maximum displacement from equilibrium is A and the total mechanical energy of the system is E. What is the object's velocity when its potential energy is 2/3E? the ...

**8TH GRADE LANGUAGE ARTS. HELP PLEASE MS.SUE ASAP**

I need help too on this exact question

**Algebra**

A large screen at a theater measures 65 feet diagonally. The aspect ratio (width compared to height) of the screen is 21:9. What is the approximate width and height of the screen?

**ELA**

I need help with this answer as well... I don't really understand the book much.

**Physics**

A horizontal water pipe goes from a large diameter to a small diameter and then back to the first diameter as shown in the figure below. The level of water (8cm in the larger tube and 4 cm in the constricted tube) in the small vertical tubes provides us with information about ...

**Math**

Please answer ! Answer everything! A right rectangular prism is intersected by a horizontal plane and a vertical plane. The cross section formed by the horizontal plane and the prism is a rectangle with dimensions 8 inches and 12 inches. The cross section formed by the ...

**math**

For a short distance , an elephant can run about 24 9/10 miles per hour. A human can run about 27.89 miles per hour over the same distance . How much faster does a human run that an elephant ?

**math**

3/4 - 1/3 9/12 - 4/12 5/12 I got this ..wiiii thank u so much

**math**

To meke a batch of sugar cookies , you need 0.75 cup of sugar and 1/3 cup of butter , among other ingredients. How much more sugar do you need that butter? a) 5/12 cup b) 3/4 cup c) 1/2 cup d) 2/3 cup

**math**

in one smowstorm there was 3 2/5 inches of snow ,on the ground. In a second strom, 5.65 inches were added to what was already on the ground . How much total snow was on the ground if none melted between storms? a) 2.25 in b) 9.05 in c) 1.66 in d) 5.21 in

**math**

never mind I got it ... simplify that 5/10 = 1/2 and I have to find the common denominator of 8 and is 4....

**math**

why is 4/8 ....? I was tinking that 0.5 = 5/10 in a fraction ...

**math**

sharon has 7/8 yard of fabric to use for some projects . she cut off 0.5 yard for her first project . how much material is left for the remaining projects?

**Algebra 2**

if a varies inversely as b and a=2, when b=15 find a when b=6

**Math**

Thanks for the help.

**math**

The perimeter of the rectangle is 56m the width is 4m less than the length. Find the length and the width of the triangle.

**Physics**

Two objects of different masses are joined by a light rod. a) Id the moment of inertia about the center of mas the minimum or maximum and why? b) If the two masses are 3kg and 5kg and the length of the rod is 2m, what are the moments of inertia of the system about an axis ...

**MATH ANSWER HELP**

I need the answers too plssss help I only know number #1 it is A but i need help on the others

**HELP RIGHT AWAY ( ASAP)**

I need help with this quiz too

**Biology Check answers**

Are you rely ms sue?

**Biology Check answers**

1. Which of the following correctly describes the image below? ￼ protein Molecule RNA Molecule amino Acid carboxylic Acid 2. Glucose and fructose are monosaccharides that have the same chemical formula, C6H12O6. However, they do not react...

**Writing**

same here, does any one know the answer?

**chemistry**

can i even work this? it seems like i need more before i can. pH=pka+log(.250/.350) because the question dosent give me anything else

**chemistry**

anyone know how to do this and which choice is correct?thank you so much in advance. Use the Henderson-Hasselbalch equation to calculate the pH of a buffer that is 0.350 M acetic acid and 0.250 M sodium acetate. a.4.89 b.4.47 c.4.59 d.none of the above is is not 4.74

**Trig**

I've done this one multiply times yet it never seems to work out, I'm supposed to simplify yet it never works out tan(csc^-1(x/x-1)) my first step; sin/cos(1/sin(x/x-1))

**chemistry**

number 1a is 4.66x10^23, atoms Fe number 1b is .0774mol Fe number 2 is 1.25x10^23 more atoms of copper number 3a is 4.13 mol ammonium chloride number 3b is 16.52 mol H

**chemistry**

1. i do not understand your explaination. 2. i do not understand explaination. 3. a i don't understand, so b is 16?

**chemistry**

can some one help me with a few chem questions please. A chunk of iron weighs 4.32 g. a) How many iron atoms are there in this sample? 55.85 g Fe = 1.00 mol Fe = 6.022 x 1023 atoms Fe b) How many moles of iron are there in this sample? 2. . You have a copper bar weighing 71.24...

**chemistry**

i understand!!!!!!! thank you so much. you are awesome

**chemistry**

so the answer is O and how is Ca zero on the left there is a 2 in front of it?

**chemistry**

1. In the reaction 2Ca(s) + O2(g) → 2CaO(s), which species is oxidized?

**chemistry**

is that correct?

**chemistry**

i got 29.9646 from your explaination on 1

**chemistry**

1. is incorrect, it is not .270, i have one more chance on my practice sheet to answer this. 2. was good, thanks

**chemistry**

mxl=270 so the answer to 1. is 270? so the answer to 2. is S2-? so the answer to 3. is 6.3875?

**chem**

would it be 17/20.0=?

**chemistry**

can some one let me know if i am right or wrong please

**chemistry**

1.14?

**biology**

THANK YOU!

**SOMEONE HELP PLSS**

HELPP

**biology**

Which of the following processes releases energy to be used by a cell? a phosphate group is added to ATP to form ADP. a phosphate group is removed from ADP to form ATP. a phosphate group is added to ADP to form ATP. a phosphate group is removed from ATP to form ADP. not sure ...

**AP Physics**

A large box has a mass of 500kg and the coefficient of static friction for the box and the floor is 0.45, and the coefficient of kinetic friction is 0.30. a. What is the minimum horizontal force needed to get the box moving? b. If you continue to push with that force, what ...

**AP Physics**

A mystery surprise box is sliding down a ramp at a constant speed. The box has a mass of 55.0kg and the ramp makes a 40.0œ angle with the horizontal. What is the coefficient of kinetic friction between the box and the ramp? Please help asap. Thank you.

**Art**

I personally think it's a because art has many different subjects as I've learned in my art class as I've gone through each lesson with art related to math or social studies so I think it is most likely A ;)