# Matthew

Most popular questions and responses by Matthew-
## Theoretical&Experimental Probability please help!

Please check my work thanks!! A number cube with the numbers 1 through 6 is rolled. Find the given probability. 1. P(number < 2) (1 point) A. 1/6

*asked on March 6, 2013* -
## Please help check physical science!

Please help check my answers I really want to make a 100%! 1. A mechanical wave moves through a medium, which can be (1 point) A. a liquid. B. a solid. C. a gas. D. all of the above

*asked on March 6, 2013* -
## world history

What impact did the Silk Road have on Marco Polo’s expeditions to the Mongolian Empire? Marco Polo traveled the Silk Road to reach Mongolia but the path was too treacherous and led to Polo’s death. Macro Polo used the Silk Road to reach the Mongolian

*asked on November 29, 2018* -
## English

Can you please check these sentences on history, please? Thank you, Writeacher. 1) In the 8th and the 9th centuries Scandinavian invaders, known as the Vikings, attacked the monasteries and villages near the water and robbed them. 2) King Alfred the Great

*asked on April 8, 2012* -
## differentiability

If g is a differentiable function such that g(x) is less than 0 for all real numbers x and if f prime of x equals (x2-4)*g(x), which of the following is true? A. f has a relative maximum at x=-2 and a relative minimum at x=2, B. f has a relative minimum at

*asked on December 31, 2010* -
## Physics

When jumping, a flea reaches a takeoff speed of 1.5over a distance of 0.45. A.) What is the flea's acceleration during the jump phase. B.) How long does the acceleration phase last?

*asked on September 5, 2012* -
## Math

Chris Shopper received a $800 discount loan to purchase a washer and dryer. The loan was offered at 10% for 120 days. What are the proceeds? I tried this problem and the answer is not 26.40

*asked on June 24, 2013* -
## Physics

Please help me out, I can't figure out the process for answering this question and my TA is of no help, A 0.11- ball is placed in a shallow wedge with an opening angle of 130 degrees,for each contact point between the wedge and the ball, determine the

*asked on October 7, 2009* -
## Math

Tim wants to model a doll house from a real house that measures 60 feet in length by 28 feet in width. He decides to use a scale in which ¼ inch equals 1 foot. Based on this scale, What will be the length of the longer side of Tim's model? inches What

*asked on June 25, 2013* -
## Chemistry

What is the molar mass of toluene if 0.85 g of toluene depresses the freezing point of 100 g of benzene by 0.47 degrees celsius? Kf= 5.12 C/m

*asked on May 6, 2016* -
## Physics

Bernie drove home from a vacation in 1.5 hours. He traveled a total distance of 60 miles. What was his average speed in miles per hour?

*asked on September 6, 2012* -
## Language

Read the poem and answer the questions that follow 1.There once was a cowboy named Ray 2. Who never had that much to say, 3. Except for the times 4. Stampedes stopped on a dime 5. When that cowboy named Ray hollered Hey 1.in which lines do you see

*asked on May 10, 2013* -
## Chem

At room temperature and pressure RbI crystallizes with the NaCl-type structure. (a) Use ionic radii to predict the length of the cubic unit cell edge. (b) Use this value to estimate the density. (c) At high pressure the structure transforms to one with a

*asked on January 2, 2018* -
## Chemistry

Potassium superoxide, KO2, is used for producing oxygen and removing carbon dioxide in selfcontained breathing units, space shuttles, and other enclosed spaces. First the potassium superoxide reacts with moisture to release oxygen and produce potassium

*asked on October 15, 2017* -
## math

I wrote my question wrong. It should be write 25000000 in expanded notation using the power of 10

*asked on March 7, 2010* -
## Math

Suppose that a wind is blowing in the direction S45°E at a speed of 50 km/h. A pilot is steering a plane in the direction N60°E at an airspeed (speed in still air) of 150 km/h. The true course, or track, of the plane is the direction of the resultant of

*asked on September 14, 2015* -
## Chemistry

Air bags are activated when a severe impact causes a steel ball to compress a spring and electrically ignite a detonator cap. This causes sodium azide (NaN3) to decompose explosively according to the following reaction. 2 NaN3(s)--> 2 Na(s) + 3 N2(g) What

*asked on November 18, 2012* -
## Music

How does the duration of a quarter note compare to a dotted quarter note? A) longer B) shorter**** my answer C) the same

*asked on September 18, 2017* -
## math

find the volume of the rectangular prism: base area 56 in2, height 6 inches

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

The height above the ground of a ball thrown up with a velocity of 96 feet per second from a height of 6 feet is 6+96t-16^2 feet, where t is the time in seconds. According to this model, how high is the ball after 7 seconds? Explain (Thank you in advance!

*asked on May 4, 2011* -
## English

In "Girls Can We Educate We Dads?," the writer uses dialect for all of the following reasons except to A) create a sense of rhythm B) emphasize the speaker's voice C) emphasize the speaker's viewpoint D) illustrate the theme of defiance

*asked on September 1, 2017* -
## Math

A vehicle covers 2,160 miles in 5.5 hours. What is the average speed of the vehicle to the nearest tenth. I got 55.5, but I don't think it is correct.

*asked on June 25, 2013* -
## statistics

Times for a surgical procedure are normally distributed. Method A has a mean of 28 minutes and a standard deviation of 2 minutes for completion. What is the probability that a surgical procedure conducted by method A takes at most 33 minutes to complete?

*asked on March 17, 2012* -
## math

You backpacked for a distance of 15.75 miles today. If you backpacked at an average speed of 1.26 miles per hour, how many hours did you spend backpacking today?

*asked on April 29, 2019* -
## math

A car skids to a stop, leaving four skid marks with an average length (D) of 60 feet. The road is asphalt. Skid tests reveal a drag factor(f) of 0.75. Since all four wheels were braking, the braking efficiency (n) is 100% or 1.00. To the nearest mile per

*asked on October 2, 2018* -
## Geometry

Does a regular nonagon have point symmetry? I know it has rotational symmetry but I am not sure if it would work for point symmetry I think I would.

*asked on November 21, 2018* -
## English

What is the sentence pattern for: The waterfall rushed down the steep hillside. options: s-v-io-do s-lv-pa e-v-s s-lv-pn s-v-do s-v-do-oc quest pattern s-v

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

a sphere has a diameter of 6x cen write an expression to represent the volume of the sphere in terms of pie

*asked on March 24, 2011* -
## Chemistry

A silver bar has mass of 368g. What is the volume, in cm^3, of the bar? the density of silver is 19.5 g/cm^3.?

*asked on October 11, 2007* -
## Math

Thank you for the answer now I understand. For the next question I made a mistake this is the question elli has two 8 and 1/2 pound bags of mints. She plans to put 1/12 pound at each place setting. Will she have enough mints? She has 256 guests I think

*asked on December 11, 2013* -
## Statistics

a)One game in a state lottery requires you to pick 1 heart, 1 club, 1 diamond, and 1 spade, in that order, from the 13 cards in each suit. What is the probability of getting all four picks correct and winning $5000 b)If three of the four selections in part

*asked on November 8, 2010* -
## Chemistry

What is the difference between Citric Acid C6H8O7 and H3C6H5O7? I am seeing both and don't know which is the right one. Is one a solution of citric acid? Thanks

*asked on September 29, 2014* -
## Physics

Two boys are pulling a box across a horizontal floor as shown in the figure below. vector F 1 = 50.0 N and vector F 2 = 100 N. (a) Find the resultant (or sum) force by the graphical method. (b) Find the resultant (or sum) force by the component method.

*asked on August 25, 2014* -
## Math

The smaller angle between the hands of a clock at 8:43 is what?

*asked on October 25, 2017* -
## calculus

find an equation of the curve that satisfies dy/dx=4x^3y and whose y-intercept is 7

*asked on March 19, 2011* -
## English

Writeacher, I really hope you can have a look at my last examples. I need to know which are wrong. I still have a few doubts on the use of to/at/in after have been. Thank you for helping me. 1) I haven't gone out for a walk. I have already been to school

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

An experiment requires 0.7 M NH3(aq). The stockroom manager estimates that 15 L of the base is needed. What volume of 15 M NH3(aq) will be used to prepare this amount of 0.7 M base?

*asked on March 8, 2013* -
## Math

Nine wonderful students decided to buy their math teacher an expensive present, each contributing the same amount of money. Four other students found out about the plan and joined in, agreeing to pay their share of the present's cost. This resulted in a

*asked on September 20, 2017* -
## integrated science

please help me If the following elements were involved in a chemical reaction, which one would be most likely to form a cation? chlorine (Cl) nitrogen (N) potassium (K) fluorine (F) I think it is A.

*asked on December 19, 2018* -
## math

to which subset of real numbers does the number -22 belong?

*asked on September 12, 2017* -
## Physics

When you lift a ball with a force of 82N, the ball accelerates upward with an acceleration of a. If you lift with a force of 92N, the balls acceleration is 2a. Find the weight of the ball, and the acceleration a. I tried solving this via substitution

*asked on October 18, 2009* -
## Chemistry

The diamenter of a carbon atom is 77 pm. Express this measurement in um?

*asked on October 11, 2007* -
## Substitution Method in Algebra!HELP PLZ!

Use the Substitution method to solve the system of equations. 3x + y = 5 4x - 7y = -10 multiply first equation by 4 multiply second equation by 3 thus both equations have same x or y value in this case it is the x value. 12x + 4y = 20 12x - 21y = -30 solve

*asked on November 5, 2006* -
## English

“She asks my name, and when I tell her she hoots, ‘Barbara Bush!’ Despite my vigorous protestations, the joke is repeated twice during the breakfast service.” Why is it, most likely, that Barbara Ehrenreich protested “vigorously” to the joke

*asked on January 13, 2019* -
## Chemistry

At 350 K, Kc = 0.142 for the reaction 2 BrCl(g) ⇀↽ Br2(g) + Cl2(g) An equilibrium mixture at this temperature contains equal concentrations of bromine and chlorine, 0.077 mol/L. What is the equilibrium concentration of BrCl?

*asked on April 23, 2016* -
## Physics

(Someone please help me !! I don't understand this.) Two tiny conducting spheres are identical and carry charges of -27.3C and +61.0C. They are separated by a distance of 2.64 cm. (a) What is the magnitude of the force that each sphere experiences? (b) The

*asked on February 9, 2016* -
## Chemistry Need Help

Given the chemical equation, Cl2 + F2 2ClF, how many moles of ClF are produced in the reaction, if 1.50 moles Cl2 are made to react with 1.75 moles F2 ? I got the answer 3.50 moles but it was wrong. Can anyone help me please.

*asked on February 27, 2015* -
## Physics

An unmarked police car traveling a constant 80km/h is passed by a speeder traveling 135km/h. Precisely 3.00s after the speeder passes, the police officer steps on the accelerator; if the police car's acceleration is 1.50m/s^2 , how much time passes before

*asked on October 6, 2013* -
## social studies

Mrs. Sue I need your help. Which statement BEST describes the power of government provided by the Articles of Confederation? A) The national government held most of the power. B) Congress enforced its power by taxing the states. C) The states had more

*asked on October 12, 2016* -
## Chemistry

So, they give me a word equation, where I am suppose to try and create a balanced equation for it. Ammonium phosphate and barium hydroxide react to form ammonium hydroxide and barium phosphate. 2(NH4)3PO4 + 3BaOH2 → 6NH4OH + Ba3(PO4)2 [I was thinking

*asked on February 20, 2012* -
## Physics

A charge of -5.02 μC is traveling at a speed of 8.86 × 106 m/s in a region of space where there is a magnetic field. The angle between the velocity of the charge and the field is 54.6o. A force of magnitude7.85 × 10-3 N acts on the charge. What is the

*asked on May 17, 2016* -
## algebra

If Ron put $1000 of his money into a bank account that earns a 2.3% annual interest rate, how much will he earn after 10 years if the interest is compounded A. yearly, B monthly? C. continuously?

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

Ellis plans to hand out door prizes as the guest arrive she has 256 guests every 6th guest will receive a mug and for every 14 guests will receive a t shirt. Which guest will be the first to receive both mug and at shirt? Next question is elli has 8 and

*asked on December 11, 2013* -
## Science - Chemistry

What happens when you mix Sodium Bicarbonate, Bromothymol blue, and Calcium Chloride? What is Bromthymol blue used for in this experiment?

*asked on August 17, 2012* -
## Chemistry

I need some help with some of these questions: The action of bacteria on meat and fish produces a poisonous compound called cadaverine. As its name implies, it stinks! It is 58.77 percent carbon, 13.81 percent hydrogen, and 27.40 percent nitrogen. Its

*asked on February 20, 2012* -
## Math

You are paneling an office that has 2 walls measuring 18' x 8' and 2 walls measuring 9' x 8'. How many sheets of paneling will you need, assuming each panel sheet measures 4' x 8'?

*asked on June 25, 2013* -
## physics

suppose an experimental arrangement like the one in part 2 has mass m1= 0.200kg at the 0.100m mark and a mass m2=0.100 kg at 0.750m mark. Can the system be put in equilibrium by a 0.050kg mass? if it can not be done state where it would be placed. If it

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

PLEASE CHACK MY ANSWER!!! Discussion for Applications of Linear Systems When solving a system of equations, how do you determine which method to use? My answer: I determine which method to use by looking at the equations. If both equations are in

*asked on December 15, 2016* -
## Physics

A spherical satellite has 12 identical monopropellant thrust chambers for attitude control with the following performance characteristics: thrust (each unit): 5 lbf; Is (steady state or more than 2 sec): 240 sec; Is (pulsing duration 20 msec): 150 sec; Is

*asked on February 19, 2016* -
## Physics

A baseball catcher puts on an exhibition by catching a 0.15-kg ball dropped from a helicopter at a height of 101 m. What is the speed of the ball just before it hits the catcher's glove 1.0 m above the ground? (g = 9.8 m/s2 and ignore air resistance)

*asked on November 27, 2010* -
## Calc

A rectangular box with a volume of 64 ftcubed is to be constructed with a square base and top. The cost per square foot for the bottom is 15cents, for the top is 10cents, and for the sides is 2.5cents. What dimensions will minimize the cost?

*asked on April 16, 2019* -
## math

Least to greatest quart gallon liter pint cup deciliter

*asked on November 9, 2015* -
## Chemistry

A 208 g sample of sodium-24 decays to 13.0 g of sodium-24 within 60.0 h. What is the half-life of this radioactive isotope?

*asked on December 11, 2012* -
## Science

A pallet of boxes weighing 10 tons is dropped from a lift truck from a height of 10 feet. The maximum velocity the pallet attains before hitting the ground is 6 ft/s. How much kinetic energy does the pallet have in (ft)(lbf) at this velocity?

*asked on August 31, 2010* -
## Maths

Two concentric circles are such that one circle has half the radius of the other. If a point is chosen at random inside the larger circle, the probability that it also lands outside the smaller circle is?

*asked on November 21, 2017* -
## Chem

CaCl2 reacts with AgNO3 in aqueous solutions to produce a precipitate of AgCl that can be filtered and weighed. The balanced equation for the reaction is: CaCl2 (aq) + 2 AgNO3 (aq) → 2 AgCl (s) + Ca(NO3)2 (aq) I got 59.22%.

*asked on October 13, 2017* -
## Social Studies

World War I 1. The alliance system was supposed to prevent war, but it turned a local conflict into a general European war. Why did it fail so badly? 2. World War I cost Germany and other European countries on an economic and a social level. How were

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

A person invest $4000, part at 8.5 per annum and part at 9.5. At the end of the the year the 8.5 made $16 more. How much was invested at 9.5?

*asked on September 30, 2019* -
## Chemistry

A mixture of KCr(SO4)2 and its hydrate KCr(SO4)2•12H2O has a mass of 1.6336 g. After heating to drive off all the water, the mass is only 1.4659 g. What is the weight percentage of KCr(SO4)2•12H2O in the original mixture? Report your answer to 4

*asked on October 10, 2017* -
## Calculus

Find the integral on which the curve of y = the integral from 0 to x of (6/1+2t+t^2) dt Can someone provide an explanation for this?

*asked on May 1, 2019* -
## Math

Mr. Clarkson and Mrs. Rose had an average of $180. After Mr. Clarkson spent $73 and Mrs. Rose received $38 from her father, Mr. Clarkson had 1/4 as much money as Mrs. Rose. How much money did each have at first?

*asked on February 14, 2012* -
## English

I still have a few sentences to check. I really hope you can help me check them. I added a few more sentences. 1)I think the best thing to do is working at a passion because in this way you'll work better than anyone else. 2)You feel the need to go to

*asked on April 12, 2012* -
## Probability and Statistics

The number of calls that arrive under a particular time in a cell has been established to be a Poisson distribution. The average number of calls arriving in a cell in 1 millisecond is 5. What is the probability that 8 calls arrive in a cell in a given

*asked on February 1, 2011* -
## Math

A sum of $7260 is invested at 11 1/4 % simple interest for one year. The amount, in dollars, that must be invested at 7 1/2% simple interest for one year to earn the same amount of interest?

*asked on October 25, 2017* -
## Science

Witch of the following shows the path followed by nerve impulses in a reflex

*asked on October 31, 2017* -
## Physics

query=a stone of mass 30grams is placed in a measuring cylinder containing some water. the reading of the water level increases from 50cm cubic to 60cm cubic. what is the density of the stone?

*asked on November 10, 2016* -
## Operations with Fractions

Darion needs 20 pieces of string 3/8 inch in length. He cut a 4 7/8 inch piece of string into pieces that are 3/8 of an inch long each. How many more pieces of string of string does he need?

*asked on November 15, 2014* -
## math

A florist had an equal number of red and yellow tulips. She sold 624 red tulips. Then she had 4 times as many yellow tulips as red tulips. How many tulips did she have at first. 624 X 5 ----- 3120

*asked on October 27, 2014* -
## geometry

Classify the triangle as right, acute, or obtuse if the measures of its sides are 28, 46, and 53.

*asked on May 2, 2010* -
## science

two small spheres lie 1.5 meters apart and carry identical charges. How large is the charge on each if a sphere experiences a force of 2.0 N.

*asked on February 24, 2015* -
## Math

Tim wants to model a doll house from a real house that measures 60 feet in length by 28 feet in width. He decides to use a scale in which ¼ inch equals 1 foot. Based on this scale, What will be the length of the longer side of Tim's model? inches What

*asked on June 25, 2013* -
## Mathematics

In a class of 50 students, the number of students who offer Accounting is twice as the number who offer Economics. 10 students offer neither of tsubjecs the two subjects. I. Illustrate the information on a Venn diagram. II. How many students offer

*asked on October 8, 2019* -
## Physics

A 1000 kg roller coaster begins on a 10 m tall hill with an initial velocity of 6m/s and travels down before traveling up a second hill. As the coaster moves from its initial height to its lowest position, 1700J of energy is transformed to thermal energy

*asked on October 5, 2019* -
## English

(Nickel and Dimed) Ehrenreich’s experiences with low-wage workers revealed to her that in general, these workers treat each other A. as competition for higher-level jobs within the company B. as professionals who can help each other gain success C. with

*asked on January 13, 2019* -
## Physics

A "rocket car" is launched along a long straight track at = 0 . It moves with constant acceleration = 2.5 . At = 3.0 , a second car is launched with constant acceleration = 8.7. At what time does the second car catch up with the first one? How far have the

*asked on September 5, 2012* -
## Chemistry

Calculate delta G of a reaction with equilibrium constant, K= 9.5 x 10^5 at 25 degrees C

*asked on July 10, 2013* -
## Math

A cone is inscribed in a sphere of diameter 32 cm. Angle between height and slant height of the cone is 30. Find the volume of the cone.

*asked on November 29, 2018* -
## Chemistry

I need some help with some of these questions: The action of bacteria on meat and fish produces a poisonous compound called cadaverine. As its name implies, it stinks! It is 58.77 percent carbon, 13.81 percent hydrogen, and 27.40 percent nitrogen. Its

*asked on February 20, 2012* -
## HELP AP Biology

I need help. I read over my book over and over again and I still don't get the question or even know how to answer it. Describe the process of speciation in relation to change in gene frequency, change in environment, natural selection, and genetic drift.

*asked on December 6, 2018* -
## Chemistry Help

How many milliliters of 0.534 M Ba(OH)2 solution are needed to completely neutralize 34.5 mL of 0.220 M HBr solution? The reaction is Ba(OH)2(aq) + 2HBr(aq) → BaBr2(aq) + 2H2O(l) I did 0.0345 * 0.220 = 0.00759 Moles of HCl =2*0.00759= 0.01518

*asked on February 27, 2015* -
## math

The value, V, of a $25000 vehicle after y years is given by V = 25000 (0.85)y What is the rate of depreciation? (1 mark) What will the car be worth after 5 years? (1 mark) To the nearest month, how long would it take to reduce the vehicle’s value to 10%

*asked on March 17, 2013* -
## Caculas

(Airplane & Radar) An airplane is flying (horizontally) at the height of 6 km on a flight path that will take it directly over a radar tracking station (on ground). If the distance D between the plane and the radar is decreasing at a rate of 300 km/hr,

*asked on December 16, 2011* -
## Physical Science

Suppose you dissolve 40g of potassium nitrate in 100 cm3 of water at 100 C. If half the solution os poured out, how many grams of potassium nitrate will the remaining solution contain?

*asked on February 7, 2011* -
## Calculus

Use cylindrical shells to find the volume V of a right circular cone with height 7h and base radius 4r.

*asked on September 9, 2010* -
## Math

Two small planes start from the same point and fly in the opposite directions. The first plane is flying 35 mph slower than the second plane. In 2 hrs, the planes are 530 mi apart. Find the rate of the slow plane.

*asked on February 3, 2010* -
## Algebra

A woman is 43 years old, and her daughter is 15 years old. How many years will it be before the woman’s age is just twice her daughter’s?

*asked on September 28, 2019* -
## Math Algebra

Learning Center would like a possible net profit of $650,000 on its new resource manual it sells to schools. The fixed costs for producing the manual are $780,000 and the variable cost per package is $19.85. If the estimated unit sales are 1,250,000 units,

*asked on February 26, 2016* -
## Chemistry

Doing some homework, are my answers right? HCN= Polar HCOOH= Polar H2CCCH2= Nonpolar Out of the following elements: Na, H, and Au order them least to greatest in the following: Eletronegativity= Na is smallest, H is second, Au is largest Ionization Energy=

*asked on April 3, 2014* -
## language arts

from the following words I got to separate them into 3 groups: omitted syllable, omitted letter, and added syllable. drowned, restaurant, ivory, chocolate, desperate, lightning, adjective, penetrate, aspirin, athletes, identity , sisastrous, ecstatic,

*asked on April 7, 2011* -
## drawing

a)One game in a state lottery requires you to pick 1 heart, 1 club, 1 diamond, and 1 spade, in that order, from the 13 cards in each suit. What is the probability of getting all four picks correct and winning $5000 b)If three of the four selections in part

*asked on November 8, 2010*