# Ray

Most popular questions and responses by Ray-
## Math (Pre-Cal) (Exponential Functions)

A car was valued at $38,000 in the year 2003. The value depreciated to $11,000 by the year 2009. Assume that the car value continues to drop by the same percentage. -What will the value be in the year 2013?

*asked on February 19, 2016* -
## Math (Stats)

What is the difference between class limits and class boundaries? A) Class limits are the numbers that separate classes without forming gaps between them. Class boundaries are the least and greatest numbers that can belong to the class. For integer data,

*asked on January 13, 2017* -
## Math

The population of bacteria in a petri dish doubles every 12 h. The population of the bacteria is initially 500 organisms. How long will it take for the population of the bacteria to reach 800? Round your answer to the nearest tenth of an hour.

*asked on January 31, 2017* -
## Chemistry

A 522g piece of copper tubing is heated to 89.5C and placed in an insulated vessel containing 159g of water at 22.8C. Assuming no loss of water and a heat capacity for the vessel of 10.0J/K, what is the final temperature of the system ( c of copper = 0.387

*asked on November 11, 2008* -
## Math (Calculus) (Work)

Six and one-half foot-pounds of work is required to compress a spring 4 inches from its natural length. Find the work required to compress the spring an additional one-half inch. (Round your answer to two decimal places.) This is what I did so far: 4 in =

*asked on May 2, 2017* -
## physiscs

a pendulum of the length L is suspended from the ceiling of an elevator. When the elevator is at rest , the period of the pendulum is T. In instant when the pendulum reaches its highest position the elevator starts the free fall. What is the period of the

*asked on September 21, 2010* -
## British Literature

1)What theory does the narrator propose in the first paragraph of “The Mark of the Beast”? A) In Asia, Asian gods rather than the Christian God control most events. B) The British Empire is doomed because it disregards the values and traditions of

*asked on July 21, 2010* -
## Physics

In a playground, there is a small merry-go-round of radius 1.20 m and mass 190 kg. Its radius of gyration (see Problem 85 of Chapter 10) is 91.0 cm. A child of mass 44.0 kg runs at a speed of 4.50 m/s along a path that is tangent to the rim of the

*asked on October 26, 2009* -
## Statistics

The law of large numbers tells us what happens in the long run. Like many games of chance, the numbers racket has outcomes so variable - one three-digit number wins $600 and all others win nothing - that gamblers never reach "the long run." Even after many

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

1.630 g of iron ore is dissolved in an acidic solution. This solution is titrated to a pink endpoint with 27.15 mL of a 0.020 M KMnO4 solution. a. How many moles of MnO4- ions were consumed? b. How many moles of Fe2+ were in the iron ore sample? c. What is

*asked on September 8, 2014* -
## Math (Limits)

What is the limit of g(x)=x as x approaches pi? Would it just be pi??

*asked on October 2, 2016* -
## Chemistry

Silicon carbide (SiC) is made by reacting sand (Silicon dioxide, SiO2) with powdered carbon at high temperature. Carbon monoxide is also formed. What is the percent yield if 51.4kg of SiC is recovered from processing 100.0kg of sand? What mass (in kg) of

*asked on October 25, 2016* -
## Science

Egg-laying land animals have evolved to produce eggs with tough shells to ensure that 1 external fertilization can take place. 2 the egg and sperm can fuse 3 parental care is unnecessary*** 4 the developing embryo does no dry out

*asked on February 8, 2018* -
## English

1. Which of the following sentences is punctuated correctly? a. The ladiess’s hates were all purple: they looked so pretty. b. We sat down to eat our meal outside; the night was beautiful. c. The string heavyset fighter won his first fight, and he was

*asked on January 7, 2018* -
## Algebra

A car rental agency advertised renting a car for $24.95 per day and $0.33 per mile.If David rents this car for 3 days, how many whole miles can he drive on a $100 budget?

*asked on February 19, 2015* -
## english plz plz help

Which of the following lines of dialogue best reveals Ram's false heritage to the landlord? a. "You look like a man who could tell me the right place to go." b. "I am an Untouchable from the heart of India." c. "Man is forever studying ways and means until

*asked on August 18, 2015* -
## chemistry

The pH of a .10M HOBr solution is 4.8 1. What is [H+] in that solution? 2. What is [OBr-]? What is [HOBr]? (where do the H+ and OBr ions come from?) 3. what is the value of Ka for HOBr? what is the value for pKa?

*asked on April 2, 2013* -
## Physics

In a playground, there is a small merry-go-round of radius 1.20 m and mass 190 kg. Its radius of gyration (see Problem 85 of Chapter 10) is 91.0 cm. A child of mass 44.0 kg runs at a speed of 4.50 m/s along a path that is tangent to the rim of the

*asked on October 26, 2009* -
## algebra

what is the minimum value for z=3x-1/2y over the feasibility region defined by the constraints? a.-4 b.-5 c.-3 d.-6

*asked on October 3, 2013* -
## Science

A man with a genetic disease marries a woman who does not carry the disease. It is not possible for their sons to have the disease. The disease must be X-linked dominat Y-linked dominat X-linked reccesive Y-linked reccesive I'm reposting this because i

*asked on February 8, 2018* -
## math

suppose the farmer buys another 1/2 square mile of land and divides all his land into square fields 1/4 mile long and 1/4 mile wide. how many fields will he have?

*asked on September 16, 2016* -
## History

What happened to airplane manufacturing after World War II? 1 Airplane manufacturers began producing goods for the oil industry. 2 Airplane manufacturing rebounded and produced airplanes, parts, and equipment. 3 Airplane manufacturing decreased in Texas as

*asked on February 26, 2018* -
## drivers ed test

3. one way the national highway safety act helps drivers nationwide is by providing guidelines for maintenance on national highways requiring that all drivers have a federal drivers license providing drivers with insurance setting graduated drivers license

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

Calculate the heat released when 454 g of steam at 100.0C condenses and then cools to 30.0C. State your answer in calories.

*asked on April 3, 2013* -
## Chemistry

liquid hexane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water. Suppose 7.8 g of hexane is mixed with 48.4 g of oxygen. Calculate the maximum mass of carbon dioxide that could be produced by the chemical reaction.

*asked on October 24, 2018* -
## Math (misleading graphs) (Statistics)

When constructing a graph showing the population of two countries, an illustrator draws two different people with heights proportional to the populations. Identify a way in which the graph might be misleading. What is the general name for such graphs

*asked on January 16, 2017* -
## Physics

The parachute on a race car of weight 8,810 N opens at the end of a quarter-mile run when the car is traveling at 34 m/s. What total retarding force must be supplied by the parachute to stop the car in a distance of 1,100 m?

*asked on February 7, 2013* -
## Physics

Some people believe that the Moon controls their activities. The Moon moves from being directly on the opposite side of Earth from you to be being directly overhead. Assume that the Earth-Moon (center-to-center) distance is 3.82 multiplied by 108 m and

*asked on November 9, 2009* -
## History

what lead to the belief that Galveston new government system, created after the Galveston hurricane of 1900 hurt the poor This is for connexus help

*asked on January 24, 2018* -
## Physics

In a playground, there is a small merry-go-round of radius 1.20 m and mass 190 kg. Its radius of gyration (see Problem 85 of Chapter 10) is 91.0 cm. A child of mass 44.0 kg runs at a speed of 4.50 m/s along a path that is tangent to the rim of the

*asked on October 26, 2009* -
## History

what efforts did james hogg make to fix the corporate world in Texas? 1 allowed railroads to choose the path of the rail lines 2 created laws against monopolies 3 made his own insurance company 4 made it easier to start companies

*asked on January 23, 2018* -
## Calculus,Reaction rates

A man walks across a bridge at the rate of 5 ft/s as a boat passes directly beneath him at 10 ft/s. If the bridge is 10 ft above the boat, how fast are the man and the boat separating 1 second later?

*asked on November 30, 2014* -
## Statistics

The law of large numbers tells us what happens in the long run. Like many games of chance, the numbers racket has outcomes so variable - one three-digit number wins $600 and all others win nothing - that gamblers never reach "the long run." Even after many

*asked on February 25, 2014* -
## Math 142 (Pre-Cal) (Circles)

A wheel spins through 29 revolutions per minute. Find the angular velocity and the linear velocity if the radius of the wheel is 1.8 feet. w=? (rad/min) v=? (feet/min)

*asked on March 31, 2016* -
## Math (Stats)

In order to predict y-values using the equation of a regression line, what must be true about the correlation coefficient of the variables? A. The correlation between variables must be an x-value of a point on the graph. B. The correlation between

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

A 200-g block is attached to a horizontal spring and executes simple harmonic motion with a period of 0.250 s. If the total energy of the system is 2.00 J, find (a) The force constant of the spring and (b) The amplitude of the motion.

*asked on February 17, 2011* -
## physics

The drawing shows a person looking at a building on top of which an antenna is mounted. The horizontal distance between the person's eyes and the building is 85.0 m. In part a the person is looking at the base of the antenna, and his line of sight makes an

*asked on August 25, 2010* -
## Math

A truck with 40-in.-diameter wheels is traveling at 50 mi/h. a) Find the angular speed of the wheels in rad/min b) How many revolutions per minute do the wheels make?

*asked on February 11, 2014* -
## math

a recipe that will make 3 pie call for 7 cups of flour. write a proportion and solve it to find how many pies can be made with 28 cups of flour

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

Write an algebraic expression that requires each of the following properties of real numbers to simplify, in the order given: the Distributive Property, the Associative Property of Addition, the Commutative Property of Addition, and the Distributive

*asked on September 17, 2013* -
## physics

Soccer player #1 is 8.6 m from the goal. If she kicks the ball directly into the net, the ball has a displacement labeled A. If, on the other hand, she first kicks it to player #2, who then kicks it into the net, the ball under goes two successive

*asked on August 25, 2010* -
## Chemistry

How many moles of acetic acid are present in 10.00 mL if the concentration is 0.500M HC2H3O2?

*asked on August 12, 2015* -
## Math (Secant Lines)

Consider the function f(x)=sqrt(x) and the point P(4,2) on the graph of f? -Consider the graph f with secant lines passing through p(4,2) and Q(x,f(x)) for x-values 1, 3, and 5. -Find the slope of each secant line -Use the results to estimate the slope of

*asked on October 1, 2016* -
## Chemistry (molarity) (sorta an emergency)

I'm doing a titration lab and writing a lab report where I'm sort of stuck on how exactly to find the concentration of HCl. These are the following info I have from the lab, Equation: HCl(aq)+NaOH(aq)-> H2O(l)+NaCl(aq) -Calculated molarity of NaOH solution

*asked on November 13, 2016* -
## algebra

The pressure on a scuba diver at sea level is 14.7 pound psi.The pressure increases 0.0445 psi for each foot of depth. Suppose the diver is 32.5 psi. How deep is he?

*asked on September 15, 2016* -
## Math checking answers (Calculus Differentials)

The radius of a spherical balloon is measured as 8 inches, with a possible error of 0.02inch. a) Use differentials to approximate the possible propagated error in computing the volume of the sphere. b) Use differentials to approximate the possible

*asked on November 14, 2016* -
## physics

a dike in Holland springs a leak through a hole of area 1cm squared at a depth of 2m below the water surface. How much force must a boy apply to the hole with his thumb to stop the leak? can he do it?

*asked on October 12, 2011* -
## Physics

A football is kicked at an angle of 45° to the horizontal over a defence line up with a velocity of 15m/s. Calculate the magnitude of the horizontal velocity of the ball at its highest point neglecting friction

*asked on June 14, 2018* -
## help please english

what is a word that is in the ip family that means a baby bird. I have no clue need help

*asked on February 21, 2013* -
## Physics- Start off good?

Estimate the moment of inertia of a bicycle wheel 67 cm in diameter. The rim of the tire have a combination mass of 1.1kg. (1.1)(67) = 73.3

*asked on February 3, 2015* -
## math

Jerry is packing cylindrical cans with diameter 6 in. and height 10 in. tightly into a box that measures 3 ft by 2 ft by 1 ft. All rows must contain the same number of cans. The cans can touch each other. He then fills all the empty space in the box with

*asked on April 14, 2015* -
## Calculus

F(x) = x^5 ln x A) Find the interval on which f is increasing Find the interval on which f is decreasing B) Find the local minimum value of f C) find the inflection point (x,y) Find the interval in which f is concave up Find the interval in which f is

*asked on November 1, 2012* -
## Physics

A block of wood with volume V floats in water with 0.68V submerged. In oil the block floats with 0.86V of its volume submerged. What's the density of the wood?

*asked on November 17, 2009* -
## Physics

A Texas cockroach of mass 0.17 kg runs counterclockwise around the rim of a lazy Susan (a circular disk mounted on a vertical axle) that has radius 15 cm, rotational inertia 5.5 10-3 kg·m2, and frictionless bearings. The cockroach's speed (relative to the

*asked on October 26, 2009* -
## Physics

A small solid sphere, with radius 0.25 cm and mass 0.61 g rolls without slipping on the inside of a large fixed hemisphere with radius 17 cm and a vertical axis of symmetry. The sphere starts at the top from rest. (a) What is its kinetic energy at the

*asked on October 26, 2009* -
## english

Humpty Dumpty" tells the story about an egg that fell off a wall and broke. "Humpty Dumpty" is a __ poem. A.narrative B.free verse C.limerick D.nonsense Is it a narrative(a)

*asked on February 24, 2013* -
## IDIOM

GRABBING THE BULL BY THE HORNS A WOLF IN SHEEP'S CLOTHING Thank you for using the Jiskha Homework Help Forum. This expression means to "get right to the point." If you have something to say you do not "beat around the bush" but come right out and say it.

*asked on February 21, 2007* -
## History

How were prisoner of war camps different from internment camps? 1 Prisoner of war camps held fewer people than internment camps. 2 Prisoner of war camps held captured soldiers. 3 There was more freedom in prisoner of war camps. 4 Prisoner of war camps were

*asked on February 19, 2018* -
## Chemistry

Methane, CH4 is the main component of natural gas which is used for cooking in many homes. The molar heat of combustion of methane is -890kj/mol. A cook wants to boil some water on a gas stove. If the stove burns 5.00g of methane to heat 2575 ml of water,

*asked on October 27, 2016* -
## arithmetic

Amy is building a house .the basement floor is at -15feet. the roof of the house is above the ground 25 feet. express the comparison of heights as an equality . explain the meaning of the inequality

*asked on September 8, 2014* -
## Statistics

A class survey in a large class for first-year college students asked, "About how many minutes do you study on a typical weeknight?" The mean response of the 463 students was x = 118 minutes. Suppose that we know that the study time follows a Normal

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

A trash can with a mass of 5 kg has a coefficient of static friction of μs = 0.80 and a coefficient of kinetic friction of μk = 0.22. (The Active Figure applies to a similar situation, but the values of the mass, coefficient of static friction and

*asked on February 8, 2014* -
## social studies

1. Explain two ways in which sectionalism caused conflict or tension in the United States during the early 1800s. Then explain how sectionalism affects economics and politics in the United States today. 2. which was more of a priority in presindents

*asked on September 5, 2013* -
## physics

An eyepiece is made of two positive thin lenses, each of focal length f = 20 mm, separated by a distance of 16 mm. (a) Where must a small object viewed by the eyepiece be placed so that the eye receives parallel light from the eyepiece? (b) Does the eye

*asked on May 29, 2013* -
## Statistics

Recently, a university surveyed recent graduates of the English Department for their starting salaries. Four hundred graduates returned the survey. The average salary was $25,577. The population standard deviation is $2,566. What is the 95% confidence

*asked on April 20, 2014* -
## Chem

Citric acid (H3C6H5O7) is triprotic acid which reacts with NaOH according to the balanced chemical equation shown below what volume of 0.200m Naoh is required to titrate 7.50ml of lemon juice which is 0.245 m in citric acid? H3C6H5O7+3NaOH->Na3C6H5aO7+

*asked on April 21, 2013* -
## physics

Given the quantities a = 9.7 m, b = 4.2 s, c = 69 m/s, what is the value of the quantity d = a^3/(cb^2)?

*asked on August 25, 2010* -
## Chemistry

Consider the thermal decomposition of potassium chlorate. 2 KClO3(s) ---> 2 KCl(s) + 3 O2(g) A mixture containing KCl and KClO3 weighing 1.80 g was heated producing 1.40 x 102 mL of O2 gas at STP. What percent of the original mixture was KClO3?

*asked on February 7, 2016* -
## Math (Parametrics)

Find the parametric equations of a unit circle where you start at point (0,1) at t=0 and you travel clockwise with a period of 2π? x(t)=? y(t)=?

*asked on June 3, 2016* -
## physics

circus juggler performs an act with balls that he tosses with his right hand and catches with his left had. Each ball is launched at an angle of 75° and reaches a maximum height 88 cm above the launching height. If it takes the juggler 0.2 s to catch a

*asked on November 16, 2017* -
## Chemistry (molarity)

What would the effect on your molarity of NaOH be if you had added 35 mL of water to dissolve the KHP (acid) instead of 25 mL? Explain. My answer so far is that adding more water shouldn't affect the molarity at all because water does not account for the

*asked on November 10, 2016* -
## Physics

A uniform beam of weight 520 N and length 3.4 m is suspended horizontally. On the left it is hinged to a wall; on the right is it supported by a cable bolted to the wall at distance D above the beam. The least tension that will snap the cable is 1200 N.

*asked on October 28, 2009* -
## Physics

A small solid sphere, with radius 0.25 cm and mass 0.61 g rolls without slipping on the inside of a large fixed hemisphere with radius 17 cm and a vertical axis of symmetry. The sphere starts at the top from rest. (a) What is its kinetic energy at the

*asked on October 26, 2009* -
## algebra 2

evaluate if possible 1. square root -121 A not a real number 2. 3cube-8/27 would this be 3cube -2/3 number 1 is correct i've had that one in my homeworks previously. number two i am not sure how it would actually look 3^3+ (-8)/(27)= If so to reduce it I

*asked on June 5, 2007* -
## Math

On level ground, a 60-foot-tall vertical building casts a 10-foot shadow. at the same time, another vertical building casts a 25-foot shadow. how many feet tall is the second building?

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

GE's light bulb division ordered 100.kg of tungsten for the filaments. If the tungsten comes in a cube what is the volume of the cube? What is the length of each side?

*asked on September 28, 2014* -
## physics-please answer

A coconut thrown horizontally at 20 m/s from the top of a hill 63 m high. How far from the base of the hill does the coconut hit the ground? Select one: a. 42 m b. 13 m c. 66 m d. 72 m

*asked on February 24, 2016* -
## physics

An apple falls off a tree branch located 35 meters off the ground. How many seconds does it take to hit the ground?

*asked on October 12, 2011* -
## algebra

One number is 4 times another. If the sum of their reciprocals is 5/36 , find the two numbers. I am total lost on this problem x is a number 4x is another number these should = 5/36 so my equation would be x+4x=5/36 first x i am getting 1/36 so the second

*asked on July 6, 2007* -
## Geography

how did the decade of prosperity affect the lives of many Mexican-Americans in Texas They became wealthier They became migrant laborers They Moved to other states They Entered New Industries My answer is the 3rd one please check that for me!

*asked on January 31, 2018* -
## Statistics

Mileage tests were conducted on a randomly selected sample of 100 newly developed automobile tires. The results showed that the average tread life was 52,515 miles with a standard deviation of 3,550 miles. What is the best estimate of the average tread

*asked on April 20, 2014* -
## science

the relative age of a rock is

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

Propane gas is used to heat a tank of water. If the tank contains 200 L of water, what mass of propane will be required to raise its temperature from 20 degrees C to 65 degrees C. The heat of combustion for propane is -2220 kJ/mol.

*asked on November 4, 2010* -
## Math (Calculus) (Related Rates)

A boat pulls away from a dock at 2 m/s, but the operator has neglected to remove the tow rope used to pull the boat up to the dock. This rope runs thru a pulley which is attached to the dock at a point 1 m higher than the point at which the rope is

*asked on November 28, 2016* -
## physics

It takes 5 seconds for a stone to fall to the bottom of a mine shaft. How deep is the shaft?

*asked on December 1, 2016* -
## Chemistry help emergency? (theoretical mass/mol)

I am supposed to calculate the theoretical mass and moles of Cu. However I am given the mass of 2 reactants in the balanced equation: 3CuCl2*2H2O + 2Al -> 3Cu + 2AlCl3 + 6H2O I am given the mass of CuCl2*2H2O to be 0.477g and the mass of Al is 0.267g. If I

*asked on November 1, 2016* -
## optics

A thin, double-convex lens has a refractive index of 1.50. The radius of curvature of the front surface is 15 cm and that of the rear surface is 10 cm. See sketch. (a) How far from the lens would an image of the sun be formed? (b) How far from the lens

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

A tractor and tow truck have rubber tires on wet concrete. The tow truck drags the tractor at constant velocity while its brakes are locked. If the tow truck exerts a horizontal force of 1.0 x 10^4 N on the tractor, determine the mass of the tractor. Refer

*asked on April 12, 2019* -
## Physics

A tunnel of length L = 141 m, height H = 6.9 m high, and width 6.0 m (with a flat roof) is to be constructed at distance d = 60 m beneath the ground. The tunnel roof is to be supported entirely by square steel columns, each with a cross-sectional area of

*asked on November 3, 2009* -
## Math (Calc) (Differential Equations)

The rate of change in the number of miles s of road cleared per hour by a snowplow is inversely proportional to the depth h of snow. That is, ds/dh = k/h Find s as a function of h given that s = 25 miles when h = 3 inches and s = 10 miles when h = 9 inches

*asked on May 31, 2017* -
## math

Explain another way to help you find the product of 8x6 without repeated addition.

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

Isotopes (select one or more): are chemicals that react only with protons. for an element have the same chemical properties. are atoms of an element that differ in the number of protons. are atoms of an element that differ in the number of neutrons. for an

*asked on December 12, 2011* -
## Chemistry

A sample of glucose, C6H12O6, contains 1.300x10exponent21 atoms of carbon. How many atoms of Hydrogen does it contain? How many molecules of glucose does it contain?

*asked on June 15, 2011* -
## Physics

A orbiting satellite stays over a certain spot on the equator of (rotating) Mercury. What is the altitude of the orbit (called a "synchronous orbit")?

*asked on November 11, 2009* -
## Math/Chemistry

Your friend eats 50.0g tuna steak. You find out that the tuna is 0.001% (by mass) mercury. The lethal dose of mercury is 5.5x10^-3 mg of mercury. Should you take your friend to the hospital?

*asked on October 11, 2016* -
## economics

When Mcdonal's corp reduced the price of its big mac by 75% if consumers also purchase french fries and a soft drink. the company was hoping the novel promotion would receive its U.S. sales growth. It didn't. within two weeks, sales had fallen. Using your

*asked on May 27, 2009* -
## Economics

To minimize the cost of producing a given quantity of output, the input bundle must be chosen so that the marginal products of all inputs are identical. True or false?

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

Suppose a hockey puck slides down a frictionless ramp with an acceleration of 4.70 m/s2. (a)What angle does the ramp make with respect to the horizontal? (b) If the ramp has a length of 6.40 m, how long does it take the puck to reach the bottom? (c) Now

*asked on February 6, 2014* -
## business calculus

A rectangular area is to be enclosed and divided into thirds. The family has $700 to spend for the fencing material. The outside fence costs $12 per running foot installed, and the dividers cost $30 per running foot installed. What are the dimensions that

*asked on May 3, 2008* -
## physics

A hypodermic syringe is attached to a needle that has an internal radius of 0.303 mm and a length of 3.02 cm. The needle is filled with a solution of viscosity 2.00 10-3 Pa · s; it is injected into a vein at a gauge pressure of 16.1 mm Hg. Ignore the

*asked on March 22, 2013*