# Steph

Popular questions and responses by Steph-
## Chemistry

Imagine that you mix 50 g of a solute with 100 g of water at 40 degree C. Classify each solute by whether it would completely or partially dissolve under these conditions. -KCl -KClO3 -K2Cr2O3 -KNO3 -NaNO3 -Pb(NO3)2 I need help understanding the

*asked on October 11, 2011* -
## physics class-Help!!!

A 3.0 m rod is pivoted about its left end.A force of 6.0 N is applied perpendicular to the rod at a distance of 1.2 m from the pivot causing a ccw torque, and a force of 5.2 is applied at the end of the rod 3.0 m from the pivot. The 5.2 N is at an angle of

*asked on July 16, 2008* -
## physics

a 200kg sailboat experiences an eastward force of 3000N by the ocean tide and a wind force against its sails with magnitude of 6000N directed toward the northwest (45 degrees north of west). what is the magnitude of the resultant acceleration?

*asked on October 23, 2008* -
## pre-calc

Physics: a ball is thrown vertically upward with an initial velocity of 80 feet per second. the distance (in feet) of the ball from the ground after t seconds if s=80t-16tt^2 a) draw the illustration b) for what time interval is the ball more than 96 feet

*asked on November 10, 2011* -
## CVP Analysis - Business Math

Engineering estimates show that the variable cost of manufacturing a new product will be $35 per unit. Based on market research, the selling price of the product is to be $120 per unit and variable selling expense is expected to be $15 per unit. The fixed

*asked on October 16, 2012* -
## Physics

A driver of a car going 90.0km/h suddenly sees the lights of a barrier 40.0 metres ahead. It takes the driver 0.75 seconds before she applies the brakes, and the average acceleration during braking is -10.0 m/s squared. Does the car hit the barrier?SHow

*asked on February 13, 2011* -
## math

Area of a rombus: A=1/2d1d2. Solve for d1

*asked on October 30, 2012* -
## Chemistry

Write a balanced chemical equation for the reaction of propylamine with water. Is propylamine --> CH3CH2CH2NH2? Is the equation CH3CH2CH2NH2 + H2O --> CH3CH2CH2NH3+ + OH- right? Isn't this balanced?

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

a hollow metal sphere has an internal radius of 20cm and an external radius of 30cm , given that the density of the metal is 7.8, find the mass of the sphere , expressing your answer in kg.

*asked on July 4, 2016* -
## Physics

On a cold winter day, a penny (mass 2.50 g) and a nickel (mass 5.00 g) are lying on the smooth (frictionless) surface of a frozen lake. With your finger, you flick the penny toward the nickel with a speed of 2.50 m/s . The coins collide elastically;

*asked on November 24, 2017* -
## pre-calc

construction of a rain gutter: a piece of rectangular sheet metal is 20 inches wide. it is to be made into a rain gutter by turning the edges to form parallel sides. let x represent the length of each of the parallel. a) give the restrictions on x. b)

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

what is the kyoto protocol?

*asked on March 18, 2012* -
## pre-calc

analyzing the motion of a projectile: a projectile is fired from a cliff 200 feet above the water at an inclination of 45 degrees, with a muzzle velocity of 50 feet per second. the height of the projectile above the water is given by h(x)= -0.0128x^2+x+200

*asked on November 10, 2011* -
## Chemistry

A student collected concentration data to determine the rate of the decomposition of N2O5 to NO2 and O2. The data were recorded in the table below. What is the rate law of this reaction? k[N2O5] k[N2O5]2 k k[NO2]

*asked on March 10, 2016* -
## pre-calc please help!!

an open box with a volume of 1500cm cubed is to be constructed by taking a piece of cardboard of 20 cm by 40 cm, cutting squares of sides length x cm from each corner and folding up the sides. show that this can be done in two ways, and find exact

*asked on November 10, 2011* -
## Chemistry

An aqueous solution of NaCl freezes at -1.6ºC. At what temperature will it boil? Given that K(b) for water is 0.52 deg m^-1.

*asked on April 17, 2013* -
## Functions/Logarithims

Energy is needed to transport a substance from outside a living cell to inside the cell. This energy is measured in kilo calories per gram molecule, and is given by E = 1.4 log (C1) / (C2 where C1 represents the concentration of the substance outside the

*asked on March 8, 2012* -
## organic chemistry

a 50% aqueous solution of ethanol (50mL total) is distilled and collected in 10-mL fractions. Predict the boiling range of each fraction

*asked on October 11, 2010* -
## Algebra

Is this sequence 10, 15, 20, 25, 30 an arithmetic or geometric sequence? Then find the explicit formula and recursive formula for the given sequence.

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

Assume that the pond contains 120 fish: 97 green, 22 yellow, and 1 red. A contestant pays $0.60 to randomly catch one fish and receives $0.40 if the fish is green, $0.95 if the fish is yellow, and $11.00 if the fish is red. How much (on average) does the

*asked on October 13, 2015* -
## pre-calc

area of a rectangular region: a farmer wishes to create two rectangular regions bordering a river, by three fences perpendicular to the river and one connecting them. suppose that x represents the length of each of the three parallel pieces of fencing. she

*asked on November 10, 2011* -
## pre-calc

path of a frogs leap: a frog leaps from a box 3 feet high and lands 4 feet from the base of the stump. we can consider the initial position of the frog to be at (0,3) and its landing position to be at (4,0). it is determined that the height of the frog as

*asked on November 10, 2011* -
## sonnet

who is the audience in shakespears sonnet 130? who is it aimed at?

*asked on October 6, 2011* -
## algebra 1

Part A: Explain why the x-coordinates of the points where the graphs of the equations y = 4x and y = 2x−2 intersect are the solutions of the equation 4x = 2x−2. Part B: Make tables to find the solution to 4x = 2x−2. Take the integer values of x

*asked on December 11, 2017* -
## MATH

How many license plates are possible consisting of 4 letters followed by 2 digits, if the first letter must be a C? Repetition is allowed.

*asked on September 4, 2016* -
## Math

The heights of three plants A,B and C in a garden are in the ratio 2 : 3 :5. their mean height is 30cm a) find the height of plant b b) if another plant D is added to the garden and the mean height of the four plant is now 33cm , find the height of D plant

*asked on July 4, 2016* -
## Arithmetic Progressions

The second term of an arithmetic progression I four times the fits term, and the first term is ten. Find the common difference and hence find the sum of the first 12 terms.

*asked on March 10, 2015* -
## Algebra please help

1 hour= 3,600 seconds and 1 mile=5,280 feet. Make a conjecture about how you would convert a speed of 15 miles per hour to feet per second. Then convert. Please help answer thx

*asked on November 20, 2014* -
## physics

A pair of vertical plane mirrors stands with an angle of β = 56.5 degrees between them. A pencil of light approaches in a direction parallel to one of them, as shown. After the pencil has left the mirrors, in which direction will it be going? (Give your

*asked on September 14, 2013* -
## Statistics

28. A group of statistics students decided to conduct a survey at their university to find the average (mean) amount of time students spend studying per week. Based on a simple random sample, they surveyed 144 students. The statistics showed that students

*asked on October 22, 2011* -
## fractions

a boy eats 1/3 and 1/2 of a pizza for himself. what fraction of the original pizza does he have left

*asked on May 22, 2011* -
## College level math

Suppose you deposit $100 in an account that earns 0.5% each month. You make no withdrawals from the account and deposit no more money into the account. How much money will you have in the account after 4 years?

*asked on January 24, 2009* -
## physics

A pendulum clock that works perfectly on Earth is taken to the Moon. (a)Does it run fast or slow there? (b) if the clock is started at 12:00:00 am, what will it read after one Earth day(24hrs)? Assume that the free-fall acceleration on the Moon is 1.63

*asked on March 21, 2007* -
## Algebra please help out

If the number in the numerator of a unit rate is 1, what does this indicate about the equivalent unit rates? Please help answer and give an example. Thanks

*asked on November 18, 2014* -
## Statistics

Suppose x has a mound-shaped distribution with sigma = 9 . A random sample of size 36 has sample mean 20. Is it appropriate to use a normal distribution to compute a confidence interval for the population mean m? Explain. Find a 95% confidence interval for

*asked on April 27, 2013* -
## physics

pipe to know how the inner diameter changes. Rank in order from largest to smallest the gas speeds va, vb, and vc at points a, b, and c. Explain in complete sentences.

*asked on June 21, 2012* -
## math

the price of a jacket was reduced by10%. during a special sale, the price was discounted another 10%. what was the total percentage discount from the original price of the jacket

*asked on September 10, 2011* -
## chemistry

When carbon is burned in air, it reacts with oxygen to form carbon dioxide. When 25.2g of carbon were burned in the presence of 78.0g of oxygen, 10.8g of oxygen remained unreacted. What mass of carbon dioxide was produced?

*asked on September 7, 2011* -
## Physics

At one point in a pipeline, the water's speed is 3.00 and the gauge pressure is 4.00×104 . Find the gauge pressure at a second point in the line 11.0 lower than the first if the pipe diameter at the second point is twice that at the first. I've been

*asked on January 30, 2010* -
## Physics

In the dangerous "sport" of bungee-jumping, a daring student jumps from a balloon with a specially designed elastic cord attached to his ankles, as shown in Figure P5.69. The unstretched length of the cord is 28.0 m, the student weighs 680 N, and the

*asked on October 12, 2009* -
## PHYSICS

Jason is practicing his tennis stroke by hitting balls against a wall. The ball leaves his racquet at a height of 57 cm above the ground at an angle of 80° with respect to the vertical. (a) The speed of the ball as it leaves the racquet is 17 m/s and it

*asked on October 16, 2007* -
## Chemistry

Asprin, c9h804, is produced through the following reaction of salicyclic acid, c7h6o3, and acetic anhydride, c4h6o3. chemical equation: c7h6o3 + c4h6o3 yields c9h8o4 + hc2h3o2 (all numbers in this equation are subscripts) At 20 degrees Celsius. how many

*asked on January 21, 2007* -
## Statistics

Scores on an IQ test are normally distributed. A sample of 15 IQ scores had standard deviation s=10. The developer of the test claims that the population standard deviation is =15. Do these data provide sufficient evidence to contradict this claim? Use the

*asked on March 12, 2019* -
## Statistics

About 74% of young adult Internet users (aged 18 to 29) use social network sites. Suppose that a sample survey contacts an SRS of 2000 young adult Internet users and calculates the proportion p̂ in this sample who use social network sites.

*asked on November 29, 2016* -
## math

if the temperature is -3f at 10:00 pm and the temperature falls four degrees overnight what is the resulting temperature

*asked on November 16, 2016* -
## Physics

Write 2.38x10 to the 6th power in standard notation

*asked on August 31, 2016* -
## Math

The sum of a number and its reciprocal is 2 9/10. Find the number.

*asked on December 5, 2015* -
## chemistry

6.3E7 cm converted to mm would be 4.3cm converted to in would be

*asked on October 4, 2015* -
## MATH

The position function of a particle is given by s(t) = t^{3}-3t^{2}-7t, t\ge 0 where s is measured in meters and t in seconds. When does the particle reach a velocity of 20 m/s? PLEASE HELP. I found the derivative which is 3t^2-6t-7. Now do I set that

*asked on September 22, 2015* -
## chem

Write the equilibrium expression for the following: 2NOCl (g) ==== 2 NO + Cl2 (g)

*asked on March 1, 2015* -
## chemistry

4. A sulfuric acid solution containing 571.6 g of H2SO4 per liter of solution has a density of 1.329 g/cm3 . Calculate a. The mass percentage b. The mole fraction c. The molality d. The molarity of H2SO4 in this solution

*asked on February 5, 2015* -
## Algebra

Mrs. Delgado has some young orange trees. He wants to plant them in 46 rows. If t is the total number of orange trees, write an algebraic expression to represent how many trees he can plant in each row. Please help write the expression. Thanks.

*asked on January 14, 2015* -
## Math 1 please help

A clothing store has the sign shown in the shop window. Pani sees the sign and wants to buy 3 shirts and 2 pairs of jeans. The cost of each shirt before the discount is $12 and the cost of each pair of jeans is $19 before the discount. Question 1. Pani

*asked on January 8, 2015* -
## Algebra please help answer

A certain colony of bacteria triples in length every 10 minutes. It's length is now 1 millimeter. How long will it be in 40 minutes? Please help answer thx

*asked on December 15, 2014* -
## Calculus

a particle moves along the x-axis at a velocity of v(t)=1 sqrt(t), t>0. at time t=1 , its position is x=4. find the acceleration and position functions for the particle

*asked on December 4, 2014* -
## Math please help out

What are the dimensions of a football field in feet? If one side is 53 1/3 yards and the other is 120 yards? Please help answer B. A chalk line is placed around the perimeter of the football field. What is the length of this line in feet? C. About how many

*asked on November 19, 2014* -
## Algebra 2

(192x^2y+72x^3)-(24rxy-9rx^2) I need help factoring completely in groups and can you please show all your work thank you

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

A sample of gas has a mass of 0.565g . Its volume is 120 mL at a temperature of 80∘C and a pressure of 747 mmHg . what is the molar mass

*asked on March 9, 2014* -
## Math

What is the domain of y = sqrt(5 - x)

*asked on November 15, 2012* -
## math

area of a trapizoid:A==h/2(b1=b2). solve for h don't know how so solve it

*asked on October 30, 2012* -
## math

you are driving to a vacation spot that is 1500 miles away. Including rest stops, it takes you 42 hours to get to the vacation spot. You estimate that you drove at an average speed of 50 miles per hour. How many hours were you not driving?

*asked on October 17, 2012* -
## Algebra

If n(A U B)=22, n(A ∩ B)=8, and n(B)=12, find n(A) If n(A)=8, n(B)=14 and n(A ∩ B)=5, find n(A U B)

*asked on September 13, 2012* -
## Math

If there are 5 teams in one league and 6 teams in another league and if each team from one league plays one team from the other league once how many games are played?

*asked on September 13, 2012* -
## chemistry

MnO2+4HCl-->MnCl2+2H20+Cl2 a. calculate the mass of MnO2 needed to produce 25 g of Cl2 b. what mass of MnCl2 is produced when 0.091 g of Cl2 is generated?

*asked on May 28, 2012* -
## prealgerbra

What is the answer to x/8-12=10 we need to find x i don't get how to do it need it quickly please help me

*asked on March 7, 2012* -
## prealgerbra

A car travels at a speed of 44 feet per second. What is the speed in miles per hour? Show all work

*asked on January 24, 2012* -
## pre algerbra

how do you solve 45 min/2 mi=?h/1 mi

*asked on January 6, 2012* -
## energy

What is the difference in energy for a photon of ultra-violet radiation, wavelength 319 nm and a photon of ultra-violet radiation, wavelength 238 nm.

*asked on December 6, 2011* -
## Energy

1.Calculate the energy of a photon whose frequency is 2450 megahertz. What is the wavelength of waves transmitted by an AM radio station operating at a frequency of 840 kilohertz? 2.

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

how do u find percent abundance?

*asked on November 19, 2011* -
## scienceee

what could be the result if a persons thymus gland was not functioning properly?

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

Write the condensed structural formula of 2,2,4-trimethylpentane. I was thinking that this might be the answer: CH_3 C(CH_3)_2 CH_2 CH(CH_3) CH_3 the symbol "_#" represents subscripts but it's not... PLEASE HELP!!!

*asked on October 25, 2011* -
## Chemistry

Draw all the possible condensed structural formulas for the organic compounds with 6 carbon atoms that have a 4-carbon chain. [I don't know how to draw condensed structural formulas with a branch on it or how this type of structure is going to come out]

*asked on October 25, 2011* -
## Chemistry

You are in a mountain range with atmospheric air pressure of 520 mmHg , and you wish to boil some eggs. What is the approximate boiling point of the water at this air pressure?

*asked on October 4, 2011* -
## Chemistry

The Vitamin C content claimed on the product label is that 1 cup of juice contains 130% of the recommended daily allowance (RDA) for vitamin C? Based on the product label claimed, how many milliliters of this juice must an adult drink to obtain the

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

A 49g piece of ice at 0.0C is added to a sample of water at 9.0C. All of the ice melts and the temperature of the water decreases to 0.0C . How many grams of water were in the sample?

*asked on September 9, 2011* -
## Math

A rectangle park measures 300 ft by 400 ft. A sidewalk runs diagonally from one corner to the opposite corner. Find the length of the sidewalk.

*asked on May 1, 2011* -
## math- algebra- help please!

12 points lie on a circumference of a circle how many inscribed triangles can be constructed having 3 vertices?

*asked on April 6, 2011* -
## physics

A laboratory centrifuge on earth makes n rpm and produces an acceleration of 3.20 g at its outer end. A) What is the acceleration (in g's, i.e., acceleration divided by g) at a point halfway out to the end? B) This centrifuge is now used in a space capsule

*asked on November 26, 2010* -
## MATH PLEASE HELP

A certain molecule contains twice as many atoms of hydrogen as oxygen and one more atom of carbon than hydrogen. If there are 31 atoms altogether in the molecule. how many atoms of carbon are there?

*asked on October 19, 2010* -
## maths

v = ax pie squared find the sqaure root

*asked on October 17, 2010* -
## algebra

Simplifying radicals: -12 radical 24 over 3 radical 2?

*asked on January 30, 2010* -
## Statistics

10, 12, 16, 17, 20 I'm having a problem figuring out how the answer is 64... how do I get that because I have to show my work Thanks for your help

*asked on June 6, 2009* -
## Math

An automobile purchased for 24000 is worth 2100 after 8 years. Assuming that the car's value depriciated steadily from year to year, what was it worth at the end of the third year?

*asked on February 3, 2009* -
## genetics

when subcloning a gene and inserting it into a vector you normally would use x-gal to locate transformants if x-gal is not available what are the alternatives

*asked on March 8, 2007* -
## english

i need to do a visual display to help teach diction, and i cant think of any ideas, i have to use examples too Let's start with what you want to teach about diction. After you decide what you want to teach, finding visuals to illustrate your points should

*asked on August 19, 2006* -
## precal

Can someone please help me solve this question? Simplify: sin^2x*secx-secx

*asked on March 31, 2020* -
## Math

Is the table a linear function or nonlinear function? x: -2, -1, 0, 1, 2 y: 16, 20, 24, 28, 32 A: Linear B: Nonlinear

*asked on January 18, 2020* -
## Math

1) Is the equation a linear function or nonlinear function? Equation: y = 2x^3 A) Linear B) Nonlinear 2) Is the equation a linear function or nonlinear function? Equation: y = 0.5x - 1 A) Linear B) Nonlinear 3) Is the equation a linear function or

*asked on January 18, 2020* -
## Math

Dani's estimate for the cost of tiling her bathroom floor is $100 plus $5 per square foot Write an equation to represent this linear function

*asked on January 18, 2020* -
## Physics

A block attached to a spring is displaced from equilibrium to the position x=+2.8m and released. The period is 1.6s . At what positions and times during the first complete cycle do the following conditions occur. a) |v|=0.5vmax, Where vmax is the maximum

*asked on September 5, 2019* -
## math

pamela is shopping for bottled water at the supermarket. which is the best buy? A 1 2-liter bottle for 0.89 B 3 1-liter bottles for 1.50 ** C 24 0.5 liter bottles for 5.25 D 36 0.025-liter bottlesfor 4.75

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

The dimensions of a rectangular pool are 28.4 feet by 18 feet. The depth is 5 feet. Each cubic foot contains approximately 7.5 gallons of water. How many gallons of water will it take to fill the pool 60% full?

*asked on April 24, 2019* -
## English

Need help editing an essay. Am I in the right place? TIA! :)

*asked on December 11, 2018* -
## AP Calculus

Consider the function f(x) = 1/4x^4 - 5/3x^3 - 3/2x^2 + 15x - 3. A. Find the relative extrema for f(x); be sure to label each as a maximum or minimum. You do not need to find function values; just find the x-values. B. Determine the interval(s) where f(x)

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

A total of $700 was split into two investments. Part paid 9% and the remainder paid 6%. If the annual interest from the two investments was $57.00, how much was invested at each rate?

*asked on November 11, 2016* -
## SS

Hi. I just got hw to do and I got one question Why do we celebrate Columbus Day? And why is it so important? - Steph

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

What is the ratio of 3 and 6? What is the ratio of 1 and 6? What is the ratio of 1 and 2? What is the ratio of 3 and 1? What is the ratio of 2 and 6? What is the ratio of 3 and 2? How do you find a ratio?

*asked on September 26, 2016* -
## maths

there are 12 questions on a paper, 80% pass rate, didn't have time to do last 3 questions will I pass if the ones I did do are correct

*asked on August 31, 2016* -
## Chemistry

Rank the following molecules in order of water solubility. ch3ch2ch2ch3, ch3oh, nacl, and ch3chohcooh

*asked on July 26, 2016*