# Posts by sasha

Total # Posts: 441

**physics**

a tennis ball of mass 20g is released from rest at a height of 4m above the ground. on hitting the ground,it raises to a height of 3m.find the velocity with which it hits the ground.

**graphing help?**

uhm im using it but when i put the function in it said there was a function error

**graphing help?**

Graph ? g(t)=4sin(3t)+2 ?. Use 3.14 for ? . Use the sine tool to graph the function. The first point must be on the midline and the second point must be a maximum or minimum value on the graph closest to the first point. How would I graph this? I have plot the points on the ...

**Psychology Stats and Research**

Although there is a popular belief that herbal remedies such as Ginkgo biloba and Ginseng may improve learning and memory in healthy adults, these effects are usually not supported by well-controlled research (Persson, Bringlov, Nilsson, and Nyberg, 2004). In a study, a ...

**spanish**

i need to write 10 snetences using 4 irregular verbs and 12 vocab words in spanish about going to a restuarant and ordering food.

**chemistry**

what is the % (m/m) of Mg(NO3)2 in solution when 0.84 g of Mg(NO3)2 are dissolved in enough deionized water to prepare 500.0 ml of solution ( assume the solution in dilute enough that the density of the solution is 1.0 g/ml)

**Science**

Never mind it is b. Thank you Ms.Sue!

**Science**

Water on Earth is either freshwater or saltwater. What is the percent ratio of freshwater to percent saltwater on Earth? A) 1% freshwater : 99% saltwater B) 3% freshwater : 97% saltwater C) 30% freshwater : 70% saltwater D) 50% freshwater : 50% saltwater I think it is either ...

**Science**

Sorry! Gosh you don't have to be that mean.

**Science**

So it is D?

**Chemistry**

An aqueous solution of ethyl alcohol is made by transfering 1.32 mL of liquid ethyl alcohol to a 50.0 mL volumetric flask, and then adding enough water to fill the flask to the mark. What is the volume/volume percentage of ethyl alcohol in the solution?

**Math**

A basketball player made 63 out of 100 attempted free throws.What percent of free throws did the player make

**math**

m∠2 + m∠3 + m∠4 = 180°/ reason: Given? m∠1 + m∠2 = 180°/reason: Supplementary Angle definition m∠1 + m∠2 = m∠2 + m∠3 + m∠4/reason: Substitution property equality m∠1 + m∠2 - m∠2 = m∠2...

**Math**

m∠2 + m∠3 + m∠4 = 180°/ reason: Given? m∠1 + m∠2 = 180°/reason: Supplementary Angle definition m∠1 + m∠2 = m∠2 + m∠3 + m∠4/reason: Substitution property equality m∠1 + m∠2 - m∠2 = m∠2...

**math**

please help.

**math**

4. Thomas is at a store buying school clothes. T-shirts are on sale for $13 each and jeans are on sale for $18 each. a) Write an equation that represents the total cost for x T-shirts and y pairs of jeans. I need help with a.. b) Thomas bought six T-shirts and his total bill ...

**math**

A line has a slope of -6 that passes through the point (-12,5). What is the equation of the line? a. 6x + y = -77 <-- or C? b. 6x + y = -67 c.-6x + y = 77 d.-6x + y = 17

**earth science**

Compare the formation processes of igneous, sedimentary, and metamorphic rocks. In general, which process can be the most direct, requiring the fewest number of steps? Which can be the most complex? I am guessing igneous rocks are the easiest because the formation process ...

**Math *corrected myself***

Sorry 1100 should be 1000, so the best answer will he 1000?

**Math *corrected myself***

he table shows the population of a school for the years 1992-2008. Year: 1992, 1994 1996, 1998, 2000, 2002, 2004, 2006, 2008 Population: 628, 656, 692,751, 793, 840 ,868, 902, 940 Which is the best prediction for the population in 2012? 1500 1100< or 1500 1175 2010

**Chemistry**

D. I believe

**Math**

The table shows the population of a school for the years 1992-2008. Year: 1992, 1994 1996, 1998, 2000, 2002, 2004, 2006, 2008 Population: 628, 656, 692,751, 793, 840 ,868, 902, 940 Which is the best prediction for the population in 2012? 1000 1100 <--- or 1000? 1150 2010

**MATH**

Sketch a rough graph of the yield of a crop as a function of the amount of fertilizer used.

**algebra**

A boat can travel 38 mph in still water. If the boat can travel 100 miles with the current in the same time it can travel 80 miles against the current, find the rate of the current r in miles per hour.

**health**

plus google isnt a reliable source for an answer

**health**

the link is suggesting weight loss is desired , but im not to sure that would be the answer

**health**

How about D? I'm confused.

**health**

Positive energy balance is important when A. weight loss is desired. B. you're stressed. C. weight stability is desired. D. a child is growing is it c ?

**Chemistry**

You have a tank of wine that needs a 20 ppm addition of SO2. Answer the following questions. 1. To make 5 gallons of a 6% w/v SO2 solution (expressed as SO2) how much K2S2O5 (222 g/mol) should be weighed out? 2. How much of this solution (in mLs) should be added to the tank (...

**language arts**

What statement in the passage weakens the argument that personal music players cause hearing loss? Experts say more research is needed to prove a definite link between portable music and DVD players and hearing loss. Twenty-nine percent of students reported saying "what&...

**Math**

no problem

**Math**

87.5% or 12.5% not sure sorry

**math**

Is there Distribute Property of Division over addition or subtraction? I have all ready have the information for Multiplication and can you please help as soon as possible as I have a test on this tomorrow!! Thank you.

**Pre- algebra**

The table goes like this. Ushdvec

**Organic Chemistry**

Why is methylene chloride (dichloromethane) used to extract eugenol from cloves, and not toluene?

**Organic Chemistry**

What is the solubility, in mg/mL, of a 50% water/50% methanol solution at 73.5 degrees Celsius? Is there a table available online somewhere?

**Organic Chemistry**

When reading an infrared (IR) spectrum for an unknown compound, you check for certain functional groups in a certain order. If C=O is absent, you check for alcohols/phenols (-OH), then for amines (N-H), then for ethers (C-O, & the absence of -OH). So, I was wondering: If you ...

**Organic Chemistry**

Simple Distillation: What is the molar composition of the vapor in equilibrium with a boiling liquid that has a composition of 60% A and 40% B? I know that the vapor should be richer in the lower-boiling substance, which is A in this case. And: If a sample of the vapor has the...

**calculus**

Find the resultant vector. 1) A force of 35 grams and 45 grams applied at right angles. 57.009 g at 52° with respect to the 35 kg force 2) Velocities of 400 mph due north and 500 mph due east. 640.31 mph at 51° with respect to the 400 mph force 3) Displacements of 90 ...

**Organic Chemistry**

I spotted a commercial TLC plate, coated with silica gel, with a pure benzoin solution. After running the TLC plate in methylene chloride, the benzoin separated into two different spots. Rf values are 0.6 and 0.9. What explains this? A pure material should have only one spot ...

**world geography**

what ethnic group dominate iran and afghanistan

**world geography**

What major cultural feature is common throughout the region? What other cultural features could you use to further divide the Persian Gulf and interior Southwest Asia into more regions?

**Organic Chemistry**

Are n-pentyl chloride and n-pentyl bromide miscible or immiscible? Why?

**Algebra**

If 18g of a radioactive substance are present initially and 8 yr later only 9 g remain, how much of the substance will be present after 20 yr?

**health**

there neexds to be four.?

**health**

what are four things that effect how many servings a person needs of each food group?

**Organic Chemistry**

I have already calculated the volume of ethyl alcohol need to dissolve 0.300 g of sulfanilamide at 78 degrees Celsius. I got 1.429 mL ethyl alcohol. My question is: how do I calculate how many grams of sulfanilamide will remain dissolved in the mother liquor (ethyl alcohol) ...

**riddle**

20 pigeons sat on the branches of a tree. A man hit 1 pigeon with a cannon. How many were left on the tree?

**alGEBRA 1**

the ratio of lemon juice to water in lemonade is 3:7 ,. if 9 cups of water aer used to make a pitcher of lemonade , how many cups of lemon juice are needed

**alGEBRA 1**

how???

**alGEBRA 1**

seven taken away from a number is it a number or varibale?

**alGEBRA 1**

write two verbal expressions for the following: 4+m write a verbal expression for the following;7-y

**Math algeabra**

when i did this problem i got this as my answer1181.102ft/h

**Math algeabra**

im confused?

**Math algeabra**

why wyu

**Math algeabra**

no i don't have it on my chart

**Math algeabra**

i have 100 cm= 1 meter

**Math algeabra**

this is the conversions on the list 60 seconds=1 minute 60 minutes=1 hour 24 hours=1 day 7 days= 1 week 52 weeks= 1 year 12 inches=1 foot 3 feet=1 yard 36 inches= 1 yard 5280 feet= 1 mile 1760 yards= 1 mile 100 centimeters= 1 meter 1000 meters = 1 kilometer 8 fluid ounces= 1 ...

**Math algeabra**

you have to use the conversions that u have on the paper only

**Math algeabra**

i don't have those measure ment on my paper

**Math algeabra**

A tortoise can travel 10 cm per second. what is the turtoise's speed in feet per hour?

**Physics**

Find x and y components of a vector which is 10 units in length and 40 degrees below the +x axis. I honestly don't even know how to begin this problem .. Please help me !

**Math (PLEASE HELP!)**

So answer to b would be 24?

**Math (PLEASE HELP!)**

The temperature of an enclosure for a pet snake should be about 27°C, give or take 3°C. (show your work) a) What absolute value expression can be used to represent this situation? b) Use the expression to determine the temperature range the enclosure should have.

**Math**

The temperature of an enclosure for a pet snake should be about 27°C, give or take 3°C. (show your work) a) What absolute value expression can be used to represent this situation? b) Use the expression to determine the temperature range the enclosure should have.

**Math**

No, the answer is two solutions, Correct?

**Math**

Is it no solutions?

**Math**

I still don't get it... Should I graph them as points? Because when I graph just x=-1 and ect... I get straight lines going up and down at the following points, (-1,0), (0,0),(1,0),(2,0),(3,0).

**Math**

How many real number solutions does the equation have? y=3x^2-5x-5 A)one solution B)two solutions C)no solutions D)infinitely many solutions I can't figure this question out. Any help would be amazing.

**Math (check answers)**

Oh great! Thank you so much!

**Math (check answers)**

Since the opening night, attendance at Play A has increased steadily, while attendance at Play B first rose and then fell. Equations modeling the daily attendance y at each play are shown below, where x is the number of days since the opening night. On what day(S) was the ...

**Math (check answers)**

1)Identify the sampling method. You want to determine the number of text messages students at your school send in a month. You go to the cafeteria and randomly ask students as they come out of the lunch line. A)Random*** B)Systematic C)Stratified D)None of these. Would the ...

**Math (check answers)**

Thank you so much!

**Math (check answers)**

1)What is the simplified form of the expression? 5d^6*d^-12? A)5d^-72 B)6d^-72 C)5d^-6**** D)6d^-6 I think that the answer is C. If anyone could tell me if I am correct that would be great.

**First Nations Studies 12**

Activity Sheet 5-10. Analysis: Louis Riel's summation to the Jury speech. Please someone help me with these questions if you can please!! I REALLY NEED THE HELP!!!??? What information is left out of his speech? What other sources of information could you use for comparison...

**math**

Mary wants to build a fence in the yard to keep her dog from running away. She only has 60 feet of fencing. If she wants to create a rectangular space that has a length that is twice as long as the width. How long is each side of the rectangular space?

**Science 8**

I need help with the same question

**Math**

Hi! I know I am asking a lot since this is a huge question, but I was wondering if anyone could help or walk me through it. I totally understand if you do not want to help. But I am really confused and any help at all would be amazing. Thank you! You are writing an article on ...

**Chemistry**

a. You are going from 3 moles of gas to 2 moles of gas and 3 moles of solid. So, you are decreasing the number of moles of gas particles, so the entropy would decrease, giving a ΔS < 0. b. Here, you're going from 2 moles of gas to 3, so ΔS would probably be ...

**Math**

My answer is A. Is that correct?

**Math**

1) Which sum best represents the model shown below? There are 3 blue blocks, and each of them separately equal x^2. There are 2 green blocks that each separately equal x. There are 2 red blocks that each separately equal -1. And there is 1 yellow block that equals 1. A) 3x^2+...

**Math**

1) Which expression represents the perimeter of the triangle drawn below? The triangle has (x-1) on the left side. (x+2) is on the bottom of the triangle. (2x-4) is on the slanted top. A) 3x-3 B) 3x-5 C) 4x-3 D) 4x-5 I do not know how to do this, so help would mean so much to ...

**math**

if $6000 is invested at 3% compounded quarterly, what is the amount after 6yrs?

**College Algebra**

So the maximum area is the vertex? Is the vertex 200, 1000? And the dimensions in order to maximize the area enclosed are 200, 125?

**College Algebra**

A rectangular enclosure is to be constructed with 2,000 feet of fence in order to have four sections, as in the diagram below. What should be the dimensions in order to maximize the area enclosed? What is the maximum area? (So the diagram is just four rectangles connected side...

**Inequalities Interval Notation**

Solve: (2 + x)(5 + x)(4 - x) < 0 (write answer in interval notation) Which I think is xe (-infinity, -5) or (-2, 4) and Solve: (4x + 1)(3 - x) > or equal to 0 (write answer in interval notation) Which im unsure

**College Algebra**

A large hotel finds that it can rent 95 rooms when it charge $100 per room. For each $1 increase in room cost it rents one room less. (Likewise, for each $1 decrease in room cost it rents one room more) What price should it charge in order to maximize the revenue? Well, ...

**chemistry**

V2= P1V1T2/P2T1 = 103*5*273/101.325*300 =4.63L

**english**

D . is the right answer because I just took the test!

**science**

1) How do decomposers increase the fertility of soil? A) By storing moisture in the soil. B) By breaking down and digesting the remains of dead organisms. C) By making spaces for air and water. D) By burrowing deep below topsoil. I am thinking is is either B or D, but I do not...

**Physics Honors**

A 47.0 g golf ball is driven from the tee with an initial speed of 48.0 m/s and rises to a height of 23.2 m. (a) Neglect air resistance and determine the kinetic energy of the ball at its highest point. (b) What is its speed when it is 8.0 m below its highest point?

**Physics Honors**

A basketball player makes a jump shot. The 0.600-kg ball is released at a height of 1.90 m above the floor with a speed of 7.40 m/s. The ball goes through the net 3.10 m above the floor at a speed of 4.40 m/s. What is the work done on the ball by air resistance, a ...

**GEO**

C. stopping French nuclear testing in the region. Just took the test!

**chemistry**

5*18=90g

**Physics**

A pond is 12 metres across. The crests of two successive waves are 60.0 cm apart and they each move across the pond in 15 seconds. a)What is the velocity of the waves? b)What is the frequency of the waves? c)What is the period of the waves?

**chemistry**

What is w when 3.37 kg of H2O(l), initially at 25.0oC, is converted into water vapour at 111oC against a constant external pressure of 1.00 atm? Assume that the vapour behaves ideally and that the density of liquid water is 1.00 g/mL. (Remember to include a "+" or &...

**chemistry**

The enthalpy change for the reaction below at 25oC is -2,252 kJ (per mole of C11H24). What is the internal energy change for the reaction at 25oC? 11 CO(g) + 23 H2(g) --> C11H24(l) + 11 H2O(l)

**chemistry**

A 0.009298-mol sample of an organic compound was burned in oxygen in a bomb calorimeter. The temperature of the calorimeter increased from 23.7oC to 27.1oC. If the heat capacity of the calorimeter is 4.84 kJ (oC)-1, then what is the constant volume heat of combustion of this ...

**PHYSICS**

Use dimensional analysis to determine the pressure, P, in the pipe to within a dimen- sionless multiplicative constant of order 1.(Hint: P may depend on another physical variable besides A and R.) Using your result from part (a), reexpress your answer in a form that involves v...

**physics**

Use the formula F=kQ1Q2/r^2. Q1+Q2=200*10^-6 C 200*10^-6 C - Q1=Q2 substitute Q2 into the top formula and solve the equation.