# jake

Popular questions and responses by jake-
## STATISTICS

A Statistics teacher has the following test scores : 93, 72, 80, 95, 90, 70, 91, 85, 86, 100 What is the median test score of these grades ?

*asked on June 3, 2010* -
## STATISTICS

There are 10 colored balls in a box ( 5 red, 3 blue, 2 green ). What is the probability of picking out a red ball and then a blue ball ( If I do not replace the red ball

*asked on June 2, 2010* -
## english

1. Write a composition using one of the topics listed below. Your composition should be three to five paragraphs long. It should contain an introduction, a body, and a conclusion. c. Compare and contrast driving in the winter and driving in the summer. 2.

*asked on January 10, 2012* -
## STATISTICS

What type of distribution is described by the following information? Mean = 56 Median = 58.1 Mode = 63

*asked on June 2, 2010* -
## Physics

If you shine an ultraviolet light on the metal ball of a negatively charged electroscope, it will discharge. But if the electroscope is positivelely charged, it won't discharge. Why?

*asked on April 2, 2008* -
## Algebra

Find all values of t such that [t] =2t+3. If you find more than one value, then list the values you find in increasing order, separated by commas. The brackets represent the floor sign function.

*asked on December 13, 2014* -
## Chemistry

If you wanted to create a equimolar buffer using 1.0 mol of NaHS in 1.0L of water what acid would you need to add? how many moles of that acid do you need to add?

*asked on February 11, 2017* -
## math

Suppose that the height (in centimeters) of a candle is a linear function of the amount of time (in hours) it has been burning. After 11 hours of burning, a candle has a height of 16.5 centimeters. After 30 hours of burning, its height is 7 centimeters.

*asked on August 4, 2020* -
## Calculus

A man of height 1.7 meters walks away from a 5-meter lamppost at a speed of 1.6 m/s. Find the rate at which his shadow is increasing in length. (Round your answer to three decimal places.) This problem is absolutely killing me I see a lot of examples like

*asked on October 7, 2015* -
## Chemistry

Which pair of ions will be most likely to react at standard state conditions? 1. a) MnO4- and Sn2+ 2. b) Zn2+ and Cl- 3. c) I- and Cu 4. d) Fe3+ and Cu2+

*asked on May 15, 2012* -
## chemistry

What is the net ionic equation for the reaction of formic acid, HCOOH, with NH3? A. H+(aq) + NH3(aq) → NH4+(aq) B. H+(aq) + OH–(aq) → H2O(l) C. HCOOH(aq) + NH3(aq) → NH4+(aq) + HCOO–(aq) D. HCOO–(aq) + H+(aq) + NH3(aq) → NH4HCOO(aq) E.

*asked on November 10, 2010* -
## Chemistry

Using the following spontaneous reactions, classify the 3 metals involved (Cr, Sn, Al) according to increasing reductant properties. a) 2Cr + 3Sn2+ 2Cr3+ + 3Sn b) Al + Cr3+ Al3+ + Cr

*asked on May 15, 2012* -
## Chemistry

The following reaction has a Delta G value of 42.6 kJ/mol at 25oC: HB(aq) +H2O(l) --> H3O+(aq) +B-(aq) Calculate Ka for the acid HB.

*asked on May 7, 2012* -
## Chemistry

If a piece of copper metal is dipped into a solution containing Cr3+ ions, what will happen? Explain with Ev values

*asked on May 15, 2012* -
## Chemistry

All of the following are postulates of the kinetic molecular theory of gases except A. The gas molecules are in constant motion. B. The gas molecules are in rapid motion. C. The collisions between molecules are elastic. D. At a constant temperature, each

*asked on December 9, 2010* -
## chem (science)

Which of the following pairs of elements are likely to form ionic compounds: A) helium and oxygen B) magnesium and chlorine C) chlorine and bromine D) potassium and sulfur E) sodium and potassium F) nitrogen and oxygen I believe the answer is d and f Would

*asked on September 18, 2011* -
## Chem

when 21.70 ml of 0.5000 m h2so4 is added to 21.70 mL of 1.000 M KOH in a coffee cup calorimeter at 23.50 degrees c, the temperature rises to 30.17 degree c. calculate delta H of this reaction (Assume that the total volume is the sum of the individual

*asked on October 7, 2014* -
## STATISTICS

The Sarasota Police department collected data on the number of car accidents ( X ) that occur each day on a certain stretch of route 41. From this data, they derived the probability distribution shown in the table below. X P(X) 0 0.80 1 0.15 2 0.05 What is

*asked on June 2, 2010* -
## math

The diagonal of a TV set is 26 inches long. Its length is 14 inches more than the height. Find the dimensions of the TV set.

*asked on February 21, 2016* -
## Chemistry

consider the following reaction at 298K 4Al(s)+3O2(g) yields 2Al2O3(s) delta H= -3351.4 Kj find delta S sys find delta S surr find delta S unvi

*asked on January 29, 2015* -
## 8th grade math

Jerome, Kevin, & Seth shared a submarine sandwich. Jerome ate 1/2 of the sandwich, Kevin ate 1/3 of the sandwich and Seth ate the rest. What is the ration of Jerome's share to Kevin's share to Seth's share? 1. 2:3:6 2. 2:6:3 3.3:1:2 4.3:2:1 5.6:3:2 please

*asked on December 7, 2012* -
## physics

5) After catching the ball, Sarah throws it back to Julie. The ball leaves Sarah's hand a distance 1.5 meters above the ground, and is moving with a speed of 22.0 m/s when it reaches a maximum height of 9.0 m above the ground. What is the speed of the ball

*asked on September 10, 2012* -
## chemistry

A gas absorbs 45 kJ of heat and does 29 kJ of work. Calculate the change in energy. The answer is 16 kJ, but I don't understand why. If a gas absorbs heat and does 29 kJ of work. Wouldn't they both be positive? Change in energy = q + w 45 kJ + 29 kJ = 74

*asked on March 31, 2010* -
## Spanish

Conjugate the following irregular verbs in the simple present tense (Indicative). 6. tener (to have) yo ________________________ 7. tener (to have) nosotros ________________________ 8. venir (to come) tú ________________________ 9. venir (to come)

*asked on February 6, 2016* -
## Physics Need Help PLEASE

Two point charges are separated by 8 cm. The attractive force between them is 14 N. If the two charges attracting each other have equal magnitude, what is the magnitude of each charge?

*asked on April 9, 2012* -
## english

1. Write a composition using one of the topics listed below. Your composition should be three to five paragraphs long. It should contain an introduction, a body, and a conclusion. c. Compare and contrast driving in the winter and driving in the summer. 2.

*asked on January 10, 2012* -
## Chemistry

Determine how many mL of solution A (acetic acid-indicator solution) must be added to solution B (sodium acetate-indicator solution) to obtain a buffer solution that is equimolar in acetate and acetic acid. Solution A: 10.0 mL 3.0e-4M bromescol green

*asked on October 29, 2012* -
## chemistry

From the following information, determine ΔH°f of malonic acid, CH2(COOH)2(s). CH2(COOH)2(s) + 2O2(g) → 3CO2(g) + 2H2O(l); ΔH° = –861.0 kJ Substance ΔH°f (kJ/mol) CO2(g) –393.5 H2O(l) –285.8 A. 2613.1 kJ B. –1540.3 kJ C. –2613.1 kJ D.

*asked on December 2, 2010* -
## Algebra

Let a1,a2,a3..... be an increasing arithmetic sequence of integers. If a4a5=13 what is a3a6?

*asked on December 13, 2014* -
## Chemistry

Which of the following compounds has the highest vapor pressure at 25°C? A. CH3CH2OH B. CH3OCH3 C. CH3CH2CH2Cl D. CH3CH2CH3 E. CH3CH2CH2CH

*asked on December 9, 2010* -
## Physics

A lead ball, with an initial temperature of 25.0oC, is released from a height of 125.0 m. It does not bounce when it hits a hard surface. Assume all the energy of the fall goes into heating the lead. Find the temperature (in degrees C) of the ball after it

*asked on February 7, 2019* -
## Chemistry

CaO(s) + 3C(s) > CaC2(s) + CO(g) deltaHrxn = +464.8 kJ/mol-rxn Is the reaction endothermic or exothermic? What is the enthalpy change if 10.0 g of CaO is allowed to react with an excess of carbon?

*asked on December 8, 2010* -
## Math Check 2 ?s quick

The angle of elevation to the top of a 20-story skyscraper is measured to be 10 from a point on the ground 1,500 feet from the building. Find the height of the skyscraper in feet, correct to three decimal places. (Points : 5) 260.47 73.86 972.54 264.49

*asked on January 14, 2014* -
## Statistics

For a 10 point quiz, the professor recorded the following scores for 8 students: 7, 8, 3, 9, 10, 6, 8, 5 What is the Mean for this set of scores?

*asked on June 1, 2010* -
## Precalculus

Write 4log2+log6-log3 as a single logarithm. Explain with steps please!~~

*asked on January 30, 2012* -
## history

4. Which sentence contains a verb in the simple past tense? A. She obeys her father. B. She has obeyed her father. C. She had obeyed her father. [D. She obeyed her father.] is my answer correct

*asked on December 14, 2011* -
## art

A sculptor creates a bust of a famous politician out of marble and places it in the outdoor courtyard of the capitol building. Why did he chose marble?

*asked on January 22, 2015* -
## chemistry

Which two orbitals from CV+ and –OH will overlap creating the C-O bond in CVOH? Which of the following accurately shows the orbital interaction that leads to bond formation between CV+ and –OH?

*asked on November 7, 2010* -
## math

The population p of a city is given by p=240,360e^0.012t where t=0 represents 1990. According to this model, when will the population reach 275,000? I know that you have to sustitute 275,000 into the p but I do not know how to solve it.

*asked on September 14, 2009* -
## Physics Help!!

A passenger on an interplanetary express bus traveling at v = 0.94c takes a seven-minute catnap by his watch. How long does the nap last from your vantage point on a fixed planet?

*asked on May 5, 2012* -
## Calculus

Suppose f(x) is a continuous function. Then a function F(x) such that F'(x) = f(x) is called: A.) the indefinite integral of f B.) the antiderivative of f C.) an antiderivative of f D.) a definite integral of f E.) All of the above

*asked on February 28, 2020* -
## chemistry

The standard internal energy change for a reaction can be symbolized as ΔU°rxn or ΔE°rxn. For the following reaction equations, calculate the energy change of the reaction at 25 °C and 1.00 bar. Sn(s) + 2Cl2(g) --> SnCl4(l) ΔH°rxn = -511.3 kJ/mol

*asked on February 28, 2016* -
## Chemistry

Complete and balance the precipitation reactions. Include physical states in your equations. Ba(NO3)2(aq) + CuSO4 (aq)---> K3PO4(aq)+MgCl2 (aq)---->

*asked on November 9, 2013* -
## Math

If an object travels in a circle 32pi/5 radians, at what degree measure is it, relative to where it started? a) 1052° b) 144° c) 72° d) 98.6° I got 1152° but there is no option for the answer, what did I wrong?

*asked on January 18, 2012* -
## algebra

For all positive integers x, let x▲ be defined to be (x-1)(x+1). Which of the following is equal to 6▲ - 5▲ ? Does this mean I'm supposed to multiply the 6 and the 5 to (x^2-1) and subtract them from each other?

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

Calculate the molar concentration of acetic acid (CH3COOH) in a 5.00-mL sample of vinegar (density is 1.00 g/mL) if it is titrated with 25.00 mL of NaOH.

*asked on March 4, 2009* -
## Physics

Mary needs to row her boat across a 100m wide river that is flowing to the east at a speed of 1.0m/s. Mary can row with a speed of .0m/s a) If mary points her boat due north, how dar from her intended landing spot will she be when she reaches the opposite

*asked on September 14, 2012* -
## writing skills

7. The best way to ensure parallel construction in your essay is to use similar A. paragraph lengths. [B. sentence structure throughout.] C. topic headings in your outline. D. details in each paragraph.

*asked on August 23, 2012* -
## Biology

Among humans, increased interest in food intake normally occurs _____. only after the production of glucose in the liver can no longer meet metabolic needs when fewer calories are taken in than are expended, but only after the body depletes its reserves of

*asked on March 14, 2012* -
## Precalculus

Solve for x: 6^(x+3) - 6^x = 215. I got answer as 1, is it correct?

*asked on January 29, 2012* -
## STATISTICS

The area under a normal curve distribution is Equal to 100 almost equal to 1 equal to 1 equal to .5

*asked on June 3, 2010* -
## Math

This month Carla caught the following fish in Lake George, 24 trout, 41 sunfish, 12 perch and 23 blue gills. If Carla catches another fish this month, what is the probability of her catching a trout? A. about 1/2 B. about 1/4 C. about 1/24 D. about 1 My

*asked on March 8, 2019* -
## chemistry

write the balanced molecular and net iconic equations for the reaction between aluminium metal and silver nitrate. Identify the oxidation and reduction half-reaction

*asked on October 19, 2014* -
## math

A candle is 17 in. tall after burning for 3 hours. After 5 hours, it is 15 in. tall. Write a linear equation to model the relationship between height h of the candle and time t. Predict how tall the candle will be after burning 8 hours.

*asked on October 9, 2012* -
## Math

How do I solve this if there is no equation to this 1. The population of the bacteria in a Petri dish increases by a factor of 10 every 10 hour. If there are initally 20 bacteria in the dish, how long will it take before the population increases to 60,000

*asked on January 28, 2012* -
## Math

1. The height of a bumble bee above the ground is modelled by h(t) = 0.5cos(2π t) + 2, where h is in metres and t is in seconds. At what time is the bee’s instantaneous rate of change of height with respect to time greatest? a.) 1 s b.) 1.25s c.) 1.5s

*asked on January 18, 2012* -
## Calculus

A hot-air balloon is 180 ft above the ground when a motorcycle passes directly beneath it (travelling in a straight line on a horizontal road) going at a constant speed of 60 ft/s. If the balloon is rising vertically at a rate of 15 ft/s, what is the rate

*asked on March 15, 2011* -
## Chemistry

If i titrated 25.0mL of 0.500M HCl with 0.500M NaOH and then 25.0mL of 0.500M of an unknown weak acid HA with 0.500M NaOH. How would the two titration curves compare at 10 or 15mL of NaOH Beyond equivelance pts? I think that they will be the ssame or

*asked on March 3, 2011* -
## chemistry

The strongest intermolecular forces present in a sample of pure I2 are A. covalent bonds. B. covalent network bonds. C. metallic bonds. D. dipole–dipole forces. E. London forces.

*asked on December 9, 2010* -
## reading

What is a summary for chapter 2 slam by Walter dean Myers

*asked on March 7, 2017* -
## Geometry

What is the area of a regular pentagon with an apothem 14 inches long and a side 20 inches long? Round the answer to the nearest inch. Answer choices: 1400 in.^2 700 in.^2 175 in.^2 140 in.^2 Give work, not answer, please.

*asked on May 14, 2016* -
## Algebra

The fifth term of an arithmetic sequence is 11. If the difference between two consecutive terms is 1, what is the product of the first two terms?

*asked on December 13, 2014* -
## Physics

Four resistors 2.1Ω, 3.2 Ω, 4.3 Ω, and 5.4 Ω are connected in a series to a 9 V battery. The effective resistance in the circuit is:

*asked on May 28, 2013* -
## phsyics

Bat is flying 5m/s while chasing an insect that is flying in the same direction. The bat emits 40kHz chirp and hears a 40.4kHz reflected sound wave. What is the speed of the insect? ??? lost

*asked on July 19, 2012* -
## Chemistry

Can a solution of CrCl3 be stored in an aluminum container?

*asked on May 15, 2012* -
## Math

In an election, ethan got 5 fewer votes than christohper,who got 3 more votes than olivia, who got 4 fewer votes than Ava. How many more votes did ava get than ethan ?

*asked on April 21, 2012* -
## Calculus

Determine an expression, in simplified form, for the slope of the secant PQ. Given: P(1,3) , Q(1+h, f(1+h)) , where f(x) = 3x^2 PQ=Y2-Y1/X2-X1 I keep getting wrong answer, arghhh.

*asked on February 8, 2012* -
## Chemistry

A 0.250-g sample of a magnesium-aluminum alloy dissolves completely in an excess of HCl (aq) . When the liberated H2 (g) is collected over water at 29 degrees celsius and 752 torr, the volume is found to be 301 mL . The vapor pressure of water at 29

*asked on February 28, 2011* -
## math

A man is 6ft tall is standing 10 feet from the base of a lamp post. The mans shadow has a lenght of 4ft . How tal is he lamp post

*asked on January 31, 2011* -
## Physics

If a cannonball and a BB have the same speed, which has the longer wavelength?

*asked on April 2, 2008* -
## Chemistry

What is the Lewis structure for salicylic acid ?

*asked on November 23, 2015* -
## Physics

A brick of mass 2.3 kg is lifted to a height of 1.9 m. How much gravitational potential energy is added to the brick? Acceleration due to gravity is g = 9.8 m/s2.

*asked on November 16, 2014* -
## Algebra

Which represents the reference angle for 3pi/4? A) (3 pi)/4 B) pi/3 C) pi/4 D) pi/6 I have no clue on how to do this. (Looking at my unit circle I think A?)

*asked on May 29, 2014* -
## science

The acceleration of gravity on the surface of Venus is 8.9m/s^2. Would a ball thrown upward on Venus return to the ground sooner or later than a ball thrown upward with the same speed on the earth?

*asked on February 22, 2013* -
## math

there are 10 marbles in a bag: 1 blue, 4 yellow, 3 red, and 2 white. if you choose a marble at random, what is the probability that you will NOT choose white?

*asked on July 16, 2012* -
## writing skills

12. Which sentence contains a prepositional phrase? A. They tried, although they didn't expect to win. [B. Running all the way, he got there early.] C. With the proper help, they'll complete the project early. D. They sang it, and sang it again.

*asked on July 2, 2012* -
## math

3. The gross income of David Vaughn is $785 per week. His deductions are $42.25, FICA tax; $90.33, income tax; 2% state tax; 1% city tax; and 3% retirement fund. What is her net income for one week? A. $675.32 B. $628.77 [C. $605.32] D. $749.77

*asked on January 10, 2012* -
## english

11. The following sentence contains which type of conjunction? He is not only a great player but also an exceptional coach. A. Correlative [B. Coordinating] C. Phrasal D. Subordinating is my answer correct

*asked on December 14, 2011* -
## math

Suppose the mean of dogs a pet shop grooms each day is known to be 14.2 dogs. If a sample of n=12 days is chosen and a total of 178 dogs are groomed during those 12 days, then the sampling error is?

*asked on December 10, 2011* -
## Economics

As the aggregate price level falls, the number of domestic products purchased by foreigners will [rise], causing the quantity of domestic output demanded to [rise]. This is known as the [foreign purchases effect]. The first two blanks can be rise,fall or

*asked on March 6, 2011* -
## chemistry

I got E) for the first and couldn't figure out the other one. Can any one verify the first and help with the second?? In which of the following processes is there a decrease in the potential energy of the substances involved? A) a coil spring is compressed

*asked on January 13, 2011* -
## chemistry

Precipitation Reactions Write a molecular equation for the precipitation reaction that occurs (if any) when the following solutions are mixed. If no reaction occurs, write NO REACTION. Express your answer as a chemical equation. Identify all of the phases

*asked on February 9, 2009* -
## Math

1.) A cooler contains fourteen bottles of Sports drinks: Seven lemon-lime flavored and seven orange flavored. You randomly grab a bottle and give it to your friend. Then, you randomly grab a bottle for yourself. What is the probability that you and your

*asked on December 12, 2019* -
## Spanish

. Choose the correct form of the verb comer (to eat) that agrees with the subject ellos. A. como B. comes C. come D. comen choose D. but I'm not sure

*asked on January 21, 2016* -
## Math

60 is 166 2/3% of what number? I got 36.14,is this correct?

*asked on October 9, 2015* -
## writing skills

5. Which of the following is a complex sentence? A. I would like to visit the Kinshasa, but I understand the city is unsafe for foreigners. [B. As Jake was reading the letter from June yet again, the flight attendant coughed gently to get his attention.]

*asked on July 2, 2012* -
## Chemistry

A solution of formic acid 0.20 M has a pH of 5.0. What is its Ka value? a) 5.0 x 10-10 b) 1.0 x 10-5 c) 5.0 x 10-5 d) 25

*asked on May 16, 2012* -
## Calculus

The fuel efficiency, E, in litres per 100 km, for a car driven at speed v, in km/h is E(v)=1600v/(v^2+6400). a) Determine the legal speed speed that will maximize the fuel efficiency if the speed limit is 50 km/h. The answer is 50 km/h but my teacher said

*asked on March 4, 2012* -
## Math

Explain how to do this with steps please. 1. Simplify cos(x-y)+cos(x+y)/cosx I did some of these so far, don't know if it is correct. Formula: cosxcosy= cos(x+y)+cos(x-y)/2 cos(x-y)+cos(x+y)/cosx =cosxcosy/2cosx

*asked on January 26, 2012* -
## Math

If the diameter of a monster truck tire is 3.5 m and it makes one rotation every 5 seconds, how far does the tire roll in 1 minute? Diameter 3.5 radius: 3.5/2 = 1.75 12(2pi x 1.75) =131.9 m the book states that its 263.89 m? What did I do wrong?

*asked on January 19, 2012* -
## Chemistry

What is the Cl concentration just as Ag2CrO4 begins to precipitate when 1.0 M AgNO3 is slowly added to a solution containing 0.015 M Cl and 0.015 M CrO4^2?

*asked on February 20, 2011* -
## chemistry

I got E) for the first and couldn't figure out the other one. Can any one verify the first and help with the second?? In which of the following processes is there a decrease in the potential energy of the substances involved? A) a coil spring is compressed

*asked on January 13, 2011* -
## college chemistry

Consider the following metals. Metal Specific Heat copper 0.385 J/(g · °C) magnesium 1.02 J/(g · °C) mercury 0.138 J/(g · °C) silver 0.237 J/(g · °C) lead 0.129 J/(g · °C) If the same amount of heat is added to 25.0 g of each of the metals, which

*asked on December 2, 2010* -
## chemistry

We add excess NaCl solution (58.44 g/mol) to 64 mL of a solution of silver nitrate (AgNO3 169.88 g/mol), to form insoluble solid AgCl. When it has been dried and weighed, the mass of AgCl (143.32 g/mol) is found to be 1.91 grams. What is the molarity of

*asked on September 20, 2010* -
## college algebra

f(x)=x^2+3; g(x)=x+4 find (fog)(-2) I have an answer of -7 or could this be just 7

*asked on April 23, 2010* -
## math

divide 100 loaves of bread amoung 5 men so that the amounts are in arithmetic progression ( increase by the same amount each time) and the sum of the three largest shares is seven times the sum of the two smallest.

*asked on August 10, 2009* -
## Math

Use the given graph of the function on the interval (0,8] to answer the following questions. Where does the function f have a local maximum? Answer (separate by commas): x= Where does the function f have a local minimum? What is the global maximum of f?

*asked on March 26, 2019* -
## MATH

A rectangular prism has a length of 8 inches, a width of 5 inches, and a height of 2 inches. What is the volume of the prism? A. 15in2 B. 40in2 C. 80in2 D. 132in2

*asked on March 3, 2019* -
## Math

What is the volume of a box that will hold exactly 567 cubes with 1/3 inch sides? I am somewhat confused on how to solve this. Please help.

*asked on February 22, 2019* -
## Chemistry

Carbonic acid forms when carbon dioxide dissolves in water according to this equation: CO2+H2O =H2CO3 How many moles of CO2 must dissolve in an excess of water to produce 3 moles of H2CO3?

*asked on December 17, 2018*