# Sydney

Most popular questions and responses by Sydney-
## chemistry

A 100.0 mL sample of 0.10 M NH3 is titrated with 0.10 M HNO3. Determine the pH of the solution before the addition of any KOH. The Kb of NH3 is 1.8 × 10-5. I thought that I would need a second volume to find the moles of NH3?

*asked on November 6, 2014* -
## statistics

In a carnival game, a player spins a wheel that stops with the pointer on one (and only one) of three colors. The likelihood of the pointer landing on each color is as follows: 65 percent BLUE, 22 percent RED, and 13 percent GREEN. Note: Your answers

*asked on March 31, 2013* -
## Chemistry

You are in a mountain range with atmospheric air pressure of 520 , and you wish to boil some eggs. What is the approximate boiling point of the water at this air pressure? Express your answer as an integer and include the appropriate units.

*asked on October 4, 2012* -
## algebra 1

How many solutions does this system have-2x+y=3 6x=9-3y A. one B. none C. infinite D. two A??

*asked on December 3, 2017* -
## Physics

A bathysphere used for deep sea exploration has a radius of 1.50 m and a mass of 1.20 × 104 kg. In order to dive, the sphere takes on mass in the form of sea water. a) Determine the mass the bathysphere must take on so that it can descend at a constant

*asked on November 21, 2010* -
## L O

Six suggestions on how to address the examples of the human rights violations

*asked on April 15, 2019* -
## Physics... HELP

A toy car runs off the edge of a table that is 1.225 meters high. If the car lands 0.400 meters from of the table, a. How long does it take for the car to fall? b. What is the horizontal velocity of the car?

*asked on December 12, 2013* -
## Language Arts

Could you please help me with these answers, I'm having serious trouble with this. What is the prepositional phrase in this sentence? Late last night there was a loud knock at the door. A. Late last night B. there was C. a loud knock D. at the door What is

*asked on May 9, 2016* -
## Math

Dori claims that 3.52 is not a rational number because it is not written as a ratio of integers. Is she correct? Explain why or why not.

*asked on September 22, 2016* -
## Physics

Suppose two boxes on a frictionless table are connected by a heavy cord of mass 1.0 kg. Calculate the acceleration (magnitude) of each box and the tension (magnitude) at each end of the cored, using the free-body diagrams shown in Figure 4-53. Assume FP =

*asked on October 13, 2011* -
## Calculus

You have just opened a new nightclub, Russ' Techno Pitstop, but are unsure of how high to set the cover charge (entrance fee). One week you charged $9 per guest and averaged 165 guests per night. The next week you charged $10 per guest and averaged 150

*asked on August 29, 2013* -
## Physics

A 90 m long train begins uniform acceleration from rest. The front of the train has a speed of 21 m/s when it passes a railway worker who is standing 184 m from where the front of the train started. What will be the speed of the last car as it passes the

*asked on September 13, 2011* -
## Chemistry

How mush CaCl2, in grams, is needed to make 2.0 L of a 3.5M solution? g CaCl2 = (2.0L) *( 3.5 mol Cl-/1L) * (1mol CaCl2/ 2mol Cl-) *( 110.98 g CaCl2/ 1 mol CaCl2) = 5.549 g CaCl2 i don't think i did any of this right

*asked on June 23, 2015* -
## CHEMISTRY!!

A student determined the calorimeter constant of the calorimeter. The student added 50.00 mL of cold water to 50.00 mK of heated , distilled water in a styrofoam cup. The initial temp of the cold water was 21,00C and the hot water, 29.15C. The maximum temp

*asked on March 3, 2010* -
## Chemistry

A 100 mL sample of 0.10M HCl is mixed with 50mL of 0.10M NH3 (Kb=1.8x10^-5). What is the resulting pH?

*asked on April 12, 2012* -
## english

consider what you have learned about American history during the period 1860 to the early 1900s. how do the stories in unit 4 reflect what was going on in the country then?

*asked on January 9, 2014* -
## Chemistry

A 100 mL sample of 0.10M HCl is mixed with 50mL of 0.10M NH3 (Kb=1.8x10^-5). What is the resulting pH?

*asked on April 12, 2012* -
## Language Arts HELP!!!

What is the most likely reason that more of the characters in the giver do not act heroically? A. children are taught at an early age that heroes are not welcome in their community. B. IN a community where everything is the same, there is no need for a

*asked on May 19, 2016* -
## Social studies

How has the US economy changed over the past 50 years? I know it used to be mainly farming and manufacturing but now we have expanded on this with medical research technology, and education but I need help expanding this answer

*asked on October 9, 2014* -
## Math HELP PLEASE QUICK!

A radio signal travels at 3 x 10^8 meters per second. How many seconds will it take for a radio signal to travel from a satellite to the surface of Earth if the satellite is orbiting at a height of 3.54 x 10^7?

*asked on April 11, 2016* -
## Chemistry

A solution is prepared by adding 50ml of 0.050M HCl to 150 ml of 0.10M HNO3. Calculate pH

*asked on May 6, 2019* -
## Chemistry

How many valence electrons are in carbon tetrachloride?

*asked on July 15, 2009* -
## Logarithm

The rate of auto thefts triples every 6 months. (a) Determine, to two decimal places, the base b for an exponential model y = Ab^t of the rate of auto thefts as a function of time in months. b = (b) Find the doubling time to the nearest tenth of a month.

*asked on September 3, 2013* -
## Art HELP PLEASE!! part 2

Artists make shapes in the backgroud smaller than shapes in the foreground to communicate their distances from the viewer. How else might a landscape artist show shapes in the background to depict their distances from the viewer? A. show shapes with

*asked on April 11, 2016* -
## Science

A Fisherman in a row boat notices that one wave crest passes his fishing line ever 5 seconds. He estimates the distance between the crests to be 1.5 meters and that the crests of the waves are about .5 meters above the troughs. Using this data, determining

*asked on March 22, 2012* -
## Language Arts

In which sentence is a pronoun used as a direct object? A. The stars of the play were Pablo and me. B. My dad gave me his old watch. C. Nan invited my sister and I to her party. D. Ask me no more questions, please

*asked on February 20, 2016* -
## French - Excerise on Passe Compose

Here is another writing prompt which basically focuses on the Passe Compose. Using the irregular verbs --Avoir, Etre. Here are the instructions: You are spending six months in Paris studying at a specific language school. Write your French teacher a letter

*asked on April 14, 2011* -
## Geometry

Given that ABC XYZ, mA = 40, and mC = 55, find mY.

*asked on October 19, 2011* -
## Ap US History

Why would former slaves and Radical Republicans describe the state of affairs following the Compromise of 1877 as “worse than slavery”? Support, refute, or modify this claim using historical evidence. i just need help starting this paper and i also

*asked on January 31, 2016* -
## English check

Which principal part of the verb to teach appears in this sentence. Then she taught me how to cultivate rich and healthy soil and helped me identify which types of plants are best for the environment in my yard. past past participle present present

*asked on October 5, 2014* -
## Physics

A shell is fired from the ground with an initial speed of 1.68 103 m/s at an initial angle of 37° to the horizontal. (a) Neglecting air resistance, find the shell's horizontal range. m (b) Find the amount of time the shell is in motion. s

*asked on October 5, 2011* -
## pre-cal

I have 2 sets of coordinates (1, 410) and (12, 788) and need to calculate the rate of change over time using y=ae^bt. Since I don't have a coordinate at 0, I can't figure out how to calculate my starting value, or a, to solve this.

*asked on December 19, 2018* -
## Math-SineLaw

Fire lookout towers are used to locate fires so they can be put out as soon as possible. These towers often work in networks and if two towers can see a fire at the same time, they can determine the location of the fire vey accurately. A.) Two forest

*asked on June 5, 2016* -
## Language Arts

Identify the indirect object in the following sentence. Mom needs to give us money before we leave. A. mom B. us C. we D. leave I think it' C, am I right?

*asked on March 15, 2016* -
## Chemistry

What happens when you dissolve CO2 (g) into NaOH (aq). (explain using net ionic equation)

*asked on March 23, 2019* -
## Language Arts

what is the meter of line 27? "one by one towns pass by" A. stressed, unstressed, stressed, unstressed, stressed, unstressed, stressed b. unstressed, stressed, unstressed, stressed, unstressed, stressed, unstressed c. unstressed, unstressed, stressed,

*asked on March 15, 2016* -
## Chemistry

what is the molarity of a solution of the strong base Ca(OH)2 in a solution that has a pH of 10.80?

*asked on April 12, 2012* -
## Algebra 1

HELP ME!!! write each polynomial in standard form 1. 4r + 3 - 9r^2 +7r 2. 10x^2+8-6x-10x^2 Simplify each polynomial. Write each in standard form. HINT: Watch for the operation! Add? Subtract? Or Multiply? 3. (2v^3-v+8)+(-v^3+v-3) 4.

*asked on April 30, 2019* -
## Math- Discrete Functions

Mary would like to save $10 000 at the end of 5 years for a future down payment on a car. How much should she deposit at the end of each week in a savings account that pays 1.2%/a, compounded monthly, to meet her goal?

*asked on August 25, 2017* -
## chemistry

Will you please help me write this equation in net ionic form. I2(s)+Na2S2O3(aq)-->Na2S2O4(aq) +NaI(aq)

*asked on August 25, 2015* -
## Social Studies

Why is diplomacy a key part of U.S. foreign policy? Because it helps prevent wars and helps countries settle issues and work together I really don't know

*asked on October 9, 2014* -
## Physics

Determine the total resistance of each of the following parallel circuits. A. A parallel circuit with a 20-ohm resistor and a 10-ohm resistor. B. A parallel circuit with two 20-ohm resistors and a 10-ohm resistor. C. A parallel circuit with a 15-ohm light

*asked on April 6, 2018* -
## Math 141

A pair of fair 6-sided dice is rolled. What is the probability that a 3 is rolled if it is known that the sum of the numbers landing uppermost is less than or equal to 6?

*asked on April 8, 2015* -
## chem:ionic equations

write below the complete ionic equation for the reaction of magnesium phosphate with lead(II)nitrate. Include which ions will be aqueous and which compound will precipitate. I understand how to balance the equation, but the example they give me is

*asked on November 27, 2007* -
## physics

A diver of mass 68.9 kg stands at the end of a diving board of mass 24.5 kg and length L = 3.29 m. The diving board is supported at two locations, labeled A and B on the diagram. A and B are separated by a distance d = 0.74 m. Observe normal sign

*asked on January 19, 2011* -
## poetry

what's the significance of the poet's structure and style choice in the poem Dover Beach?

*asked on October 23, 2016* -
## Alg/Trig

If h= -16t^2 + 112t represents the height of a rocket, in feet, t seconds after it was fired, when will the rocket hit the ground? (Hint: The rocket is on the ground when h equals=0).

*asked on February 5, 2017* -
## Chemistry

Can you please help me write the oxidation and reduction half reactions represented in each of these redox equations, and help me write the half reactions in net ionic form if they occur in aqueous solution. 1) PbO(s) + NH3(g) --> N2(g) + H2O(l) + Pb(s) 2)

*asked on August 24, 2015* -
## physics. HELP

Phil jumps off a high-diving platform with a horizontal velocity if 2.8 m/s and lands in the water 2.6 seconds later. a. How high is the platform b. How far out from where he jumped does he land?

*asked on December 12, 2013* -
## Math (Algebra)

3 robots go out to lunch. They decide to share the $11.91 bill evenly. How much does each robot pay? Equation: 3x = 11.91 #1. What does x represent? #2. Solve for x. #3. Answer the question.

*asked on May 6, 2013* -
## Physics

Two children are playing on two trampolines. The first child can bounce 1.6 times higher than the second child. The initial speed up of the second child is 5.2 m/s. (a) Find the maximum height the second child reaches. (b) What is the initial speed of the

*asked on September 14, 2011* -
## Chemistry

Calculate the heat released when 64.5g of steam at 119 C is converted to water at 36 C. Assume the specific heat is 4.184 J/g*C for water, the specific heat of steam is 1.99J/g*C, and the heat of vaporization is 40.79 kJ/mol for water.

*asked on June 17, 2011* -
## Rate based Calculus Question help

Electricity is consumed between the hours of midnight (t = 0) and 6 a.m. (t = 6). Selected values of the rate of consumption are shown in the table below, with t measured in hours past midnight, and R(t) measured in KW per hour. Use 4 trapezoids to

*asked on July 16, 2018* -
## Chemistry

An aqueous solution that 2.00 M in AgNO3 is slowly added from a buret to an aqueous solution that is 1.00×10−2 M in Cl− and 0.260 M in I−. When the second ion begins to precipitate, what is the remaining concentration of the first ion? I know that

*asked on June 5, 2016* -
## physics

A dart player throws a dart horizontally at a speed of of 12.4 m/s. The dart hits the board 0.32 meters below the height from which it was thrown. How far away is the player from the board?

*asked on December 12, 2013* -
## physics

An ethernet cable is 3.95 m long and has a mass of 0.190 kg. A transverse pulse is produced by plucking one end of the taut cable. The pulse makes four trips down and back along the cable in 0.820 s. What is the tension in the cable?

*asked on February 20, 2013* -
## Chemistry

Consider this reaction: Fe3O4(s)+4CO(g) --> 4CO2(g)+3Fe(s). If you begin with 0.03820 moles of iron oxide and 0.120 moles of carbon monoxide, how many grams of iron can be formed? Indicate which reactant is the limiting reactant. 0.03820 x 3/1= 0.1146

*asked on May 29, 2017* -
## physics

An athlete executing a long jump, leaves the ground at a 30 degree angle with the ground and travels 8.90 meters horizontally in 1.1 seconds. What was the takeoff speed of the athlete along the diagonal?

*asked on December 16, 2013* -
## physics

The x component of a certain vector is -86.0 units and the y component is +75.0 units. The magnitude of the vector is 114 m. What is the angle between the direction of the vector and the positive direction of x? Use the convention that positive angles are

*asked on October 24, 2010* -
## physics

A ship maneuvers to within 2500m of an island's 1800m high mountain peak and fires a projectile at an enemy ship 610m on the other side of the peak. If the ship shoots the projectile with an initial velocity of 250m/s at an angle of 75 degrees. how close

*asked on October 8, 2010* -
## Math/Algebra

The function T(x)=0.25(x-4400)+440 represents the tax bill T of a single person whose adjusted gross income is x dollars for income between $4400 and $17,600 inclusive. (a) What is the implied domain of the linear function? (b) What is a

*asked on March 5, 2017* -
## algebra

Mary drove from Amity to Belleville at a speed of 50 mi/h. On the way back, she drove at 60 mi/h. The total trip took 4(2/5)h of driving time. Find the distance between there two cities

*asked on December 19, 2011* -
## Cylinder Height

A cylinder has surface area of 402 cm2. The height is three times greater than the radius. What is the height of the cylinder?

*asked on January 19, 2011* -
## physics

A uniform ladder of mass m and length L leans at an angle θ against a frictionless wall. If the coefficient of static friction between the ladder and the ground is 0.43, what is the minimum angle at which the ladder will not slip? Do i use the equation

*asked on January 17, 2011* -
## Chemistry

At what temperature will 1.05 g of argon gas exert a pressure of 1.03 atm in a 5.21 L container?

*asked on May 20, 2019* -
## Math

An airplane is flying 100 km north and 185 km west of an airport. It is flying at a height of 7 km A) what is the straight long distance to the airport? B) what is the angle of elevation of the airplane, from the point of view of the airport?

*asked on June 15, 2016* -
## FRENCH

1. Quelles corvées est-ce que tu dois faire chez toi? Je dois faire la vaiselle, passer l'aspirateur, et sort la poubelle chez moi. 2. Quelles corvées est-ce que tu n'aimes pas du tout faire? Les corvées je n'aime pas du tout faire sont: changer mes

*asked on May 31, 2011* -
## Algebra

HELP ME IM DESPERATE! write this polynomial in standard form 10x^2+8-6x-10x^2 Simplify each polynomial. Write each in standard form. HINT: Watch for the operation! Add? Subtract? Or Multiply? 3. (2v^3-v+8)+(-v^3+v-3)

*asked on May 8, 2019* -
## AP US History

Adams was an accomplished patriot who was instrumental in establishing the United States and its government. However, many people believed that the Adams administration was a setback, and that his presidency did more harm than good to the new nation. Was

*asked on October 22, 2015* -
## Chemistry

Can you please explain to me how you would regulate the pressure to favor the products in the this equilibrium system. MgCO3(s)-->

*asked on August 11, 2015* -
## College Physics

Col. John Stapp led the U.S. Air Force Aero Medical Laboratory's research into the effects of higher accelerations. On Stapp's final sled run, the sled reached a speed of 284.4 m/s (632 mi/h) and then stopped with the aid of water brakes in 1.4 s. Stapp

*asked on October 6, 2014* -
## science

cells are the basic units of structure and function in living organisims ture or false

*asked on May 17, 2008* -
## Math

Use the addition property and/or the multiplication properties to find a and b. If -4

*asked on March 11, 2017* -
## Chemistry

Aluminum and oxygen are mixed together to yield aluminum oxide. If 3.17 g of Al are used, how many g of product can be made? Al+ O2 yields Al2O3

*asked on May 20, 2019* -
## Chemistry

A 0.400 gram sample of a substance contains 0.141 g of potassium, 0.115 g of sulfur, and 0.144 g of oxygen. What is the empirical formula for this compound?

*asked on May 20, 2019* -
## math

Mr. Rozario bought some numbers of apples and oranges in a ratio of 2:3. He gave away 2/3 of the apes to his sister and 23 oranges to his brother. The ratio of the number of apples to the number of oranges that he has now is 3:2. How many apple did he buy?

*asked on September 5, 2016* -
## Math - Advanced Functions

the function f(x)=-0.005x^2+0.8x+12 models the relationship between a certain vehicle's speed and a fuel economy, where f(x) is the fuel economy in kilometres per litre and x is the speed of the vehicle in kilometres per hour. Determine the rate of change

*asked on September 30, 2013* -
## Physics, URGENT!!!

We consider tobacco virus diffusing along a 0.47 m long tube filled with water. The cross-sectional area of the tube is unknown. The diffusion coefficient is found in Table 10.5, p. 319 in the textbook. A total amount of virus of 2.6 x 10-16 kg is

*asked on November 29, 2010* -
## Physics

The general relationship of oscillation T of a mass m suspended on a spring is T=2(pie)square root of m/k, where k is the spring constant. how would i change this equation into a straight line equation to graph?

*asked on January 25, 2010* -
## Algebra 2

Pls help me!! I need the answers to these few questions I just cant figure them out and I have to turn them in asap Simplify each polynomial. Write each in standard form. HINT: Watch for the operation! Add? Subtract? Or Multiply? 8. 4m(2m+9m^2-6) 9.

*asked on May 13, 2019* -
## Algebra

Sally can paint a room in 4 hours while it takes Steve 7 hours to paint the same room. How long would it take them to paint the room if they worked together?

*asked on February 22, 2017* -
## APUSH

Hi this is my essay prompt for APUSH. I am a little confused about this prompt. I don't really know where to start. Also I'm not sure what my 3 body paragraphs should be about. If you could help me with this it would be great. Thank you Sydney Why would

*asked on January 26, 2016* -
## math

greg exchanged 200 canadian dollars for 1/5 fewer u.s dollars. after spending 3/4 of the u.s dollars, how many did he have left?

*asked on January 26, 2011* -
## Algebra 1

HELP ME Simplify each polynomial Write in standard form (Hint: watch for the operations, add, sub , multiply) (6s^4+7s^2+7)+(8s^4-11s^2+9s) (4h^3+3h+1)-(-5h^3+6h-2) (8z^3-3z^2-7)-(z^3-z^2+9) 5k(3-4k) 4m(2m+9m^2-6) q(11+8q-2q^2 ) (x-2)(x+4) (6g+7)(3g-8)

*asked on May 9, 2019* -
## college algebra

A support pole for an ancient structure is found to have one-fifth of the carbon-14 of a modern, living tree. How long ago did the tree used to make the support pole die? Give your answer to the nearest whole number.

*asked on September 17, 2018* -
## AP Calculus

Can someone check my answers: 1) Use geometry to evaluate 6 int 2 (x) dx where f(x) = { |x|, -2

*asked on July 16, 2018* -
## Algebra

In a basketball game, Sam scored 34 pts, consisting only of 3 point shots and 2 point shots. He made a total of 15 shots. How many shots of each type did he make?

*asked on December 5, 2016* -
## physics. HELP

An athlete executing a long jump, leaves the ground at a 30 degree angle with the ground and travels 8.90 meters horizontally in 1.1 seconds. What was the takeoff speed of the athlete along the diagonal?

*asked on December 16, 2013* -
## math

If a prism was filled with 43 cubes with half unit side lengths. what is the volume of the prism in cubic units?

*asked on April 22, 2013* -
## algebra

A clock has a minute hand that is 14 feet long and an hour hand that is 9 feet long. What is the average speed (in mph) of the tip of the minute hand no idea how to solve this... please help :)

*asked on February 4, 2016* -
## math

suppose x is a uniform random variable with c=40 and d=70. find the standard deviation of x

*asked on February 25, 2014* -
## Physics

a dense plastic toy mass of 1.2kg is floating just beneath the surface of a pond. What is the bouyant force?

*asked on March 12, 2011* -
## Algebra

your friend spends 6+5x minutes lifting weights and 9x+8 minutes running on a treadmill. write a polynomial that represents how much more time is spent running on the treadmill than lifting weights.

*asked on June 1, 2016* -
## Chemistry

Can you please explain to me how you would regulate the pressure to favor the products in the this equilibrium system. MgCO3(s)-->

*asked on August 11, 2015* -
## physics

A missile is fired horizontally with an initial velocity of 300 m/s from the top of a cliff 200.0 meters high. a. How long does it take the missile to reach the bottom the cliff? b. How far from the base of the cliff does the missile strike the ground?

*asked on December 12, 2013* -
## Algebra 2

Please HELP ME Simplify each polynomial Write in standard form (Hint: watch for the operations, add, sub , multiply) (6s^4+7s^2+7)+(8s^4-11s^2+9s) (4h^3+3h+1)-(-5h^3+6h-2) (8z^3-3z^2-7)-(z^3-z^2+9) 5k(3-4k) 4m(2m+9m^2-6) q(11+8q-2q^2 ) (x-2)(x+4)

*asked on May 10, 2019* -
## Algebra

a small plane can fly 1575 miles in 7 hrs in a tailwind. On the return in a headwind, the same trip takes 9 hrs. find the speed in still air (no wind). Then the speed in wind.

*asked on December 9, 2016* -
## AP History

Which of the following statements about the slave trade that developed from the fifteenth century onward is correct? AThose sold into slavery by African kings were primarily undesirables such as lawbreakers or persons accused of witchcraft. [B] Slavery

*asked on September 23, 2015* -
## math

A model rocket is launched with an initial velocity of 160 ft/s. The height, h, in feet, of the rocket t seconds after the launch is given by h = −16t2 + 160t. How many seconds after launch will the rocket be 350 ft above the ground? Round to the nearest

*asked on November 22, 2013* -
## Physics

A person driving her car at 54 km/h approaches an intersection just as the traffic light turns yellow. She knows that the yellow light lasts only 2.0 s before turning to red, and she is 30 m away from the near side of the intersection. The intersection is

*asked on September 11, 2011*