# zoe

Most popular questions and responses by zoe-
## Math

Which term best completes this statement? All ______ are rectangles A. parallelograms** B. squares C. rhombi D. none of the above Which term makes this sentence true? ___ rectangles are squares A. All B. Some** C. No D. none of these The figure below is a

*asked on February 16, 2016* -
## SS

Which of the following statements best describes the spread of Islam during the Arab conquests? A. Islam spread only within the lands conquered by Arabs. B. Everyone in conquered lands was forced to convert to Islam. C. Few non-Arabs ever converted to

*asked on October 31, 2018* -
## Art

Many different techniques can be used to attract the viewer's attention. What element of art was used in this image to create emphasis on the girl? A. texture B. color C. negative space D. curved lines*** What principle of design is present in this image?

*asked on November 13, 2018* -
## physics

A large water tank is 18m above the ground. Suppose a pipe with a diameter of 8cm is connected to the tank and leads down to the ground. How fast does the water rush of the piper at ground level? Assume that the tank is open to the atmosphere.

*asked on December 11, 2012* -
## Organic chemistry

Draw major product of substitution reaction of (2R,3S)2-bromo-3-methylpentane with CH3CH2O- nucleophile?

*asked on March 6, 2011* -
## physics (SOS!)

a cylinder that is 20 cm tall is filled with water. If a hole is made in the side of the cylinder, 5cm below the top level, how far from the base of the cylinder will the stream land? Assume that the cylinder is large enough so that the level of the water

*asked on December 2, 2012* -
## Math

Write two mixed numbers with a sum of 3.

*asked on March 18, 2015* -
## Chemistry

The oxygen gas emitted from an aquatic plant during photosynthesis is collected over water at a temperature of 25 C and a total pressure of 760 torr . what is the partial pressure of the gas?

*asked on April 16, 2010* -
## maths

Sam wants to build a wooden deck on his patio, which is in the shape of a parallelogram. The area of the patio is 280 ft2. Find the width. Round your answer to the nearest foot.

*asked on July 13, 2016* -
## chemistry

A sample of natural gas is 85.2% methane, CH4, and 14.8% ethane, C2H6, by mass. What is the density of this gas mixture at 18.0°C and 771 mmHg? Assume ideal gas behavior.

*asked on October 31, 2012* -
## chemistry

A gaseous mixture containing 5 moles of H2 and 7 moles of Br2 reacts to form HBr. Write a balanced chemical equation. Which reactant is limiting? What is the theoretical yield in moles? What is the theoretical yield for this reaction in grams? How many

*asked on December 4, 2011* -
## science

Which of the following materials is a good conductor of electric current? A-Glass pane B-Wooden spoon C-Silver spoon D-Rubber tire

*asked on April 19, 2017* -
## physics

A block of wood will sink 10 cm in freshwater. How far will it sink in seawater. The specific gravity of seawater is 1.025. I'm confused as to how to approach to problem

*asked on December 2, 2012* -
## Science

A circular hatch in the hull of a submarine has a radius of 40.0 cm. The submarine is 850.0 m under water. If atmospheric pressure above the ocean is 1.01 x 105 Pa and the air pressure inside the submarine is 1.31x 105 Pa, what net force is exerted on the

*asked on December 19, 2011* -
## Chemistry

Could you please explain how electronegativity works and how you find the total electronegativity value of PO3 K2O H2S GIVEN: P- 2.1, O-3.5, K- 0.8, H- 2.1, and S- 2.5 Also how to you tell if the compound is ionic, polar covalent, or non polar covalent?

*asked on October 30, 2013* -
## Physics

A 4.10 m long, 590 kg steel beam extends horizontally from the point where it has been bolted to the framework of a new building under construction. A 66.0 kg construction worker stands at the far end of the beam. What is the magnitude of the torque about

*asked on March 21, 2013* -
## math

Vanessa deposited money into a bank account that earned 1.25% simple interest each year. After 1/2 year, she had earned $5.00 in interest on the account. If no other money was deposited into or withdrawn from the account, how much was her initial deposit?

*asked on November 16, 2016* -
## World History

Which accurately describes successors of the Arab Empire following the death of Muhammad? Members of the Boko Haram clan served as caliphs following the death of Muhammad. Members of the Umayyad clan served as caliphs following the death of Muhammad.

*asked on June 11, 2019* -
## chemistry

If 4.83 mL of an unknown gas effuses through a hole in a plate in the same time it takes 9.23 mL of argon, Ar, to effuse through the same hole under the same conditions, what is the molecular weight of the unknown gas?

*asked on October 31, 2012* -
## calculus

let f(t) = 2*pi*t + sin(2*pi*t) a) find value of t in open interval (0,2) for which the tangent line at (t, f(t)) is parallel to the line through (0,0( and (2, 4pi) b) suppose the given funtion describes the position of a particle on the x-axis for 0

*asked on November 1, 2011* -
## math!

Frank has baseball practice every 4th day and choir practice every 6th day. When will he have baseball and choir practice on the same day?

*asked on March 21, 2018* -
## Math (pre Algebra)

The perimeter of a rectangle picture frame is 30 inches. The length of the frame is three less than twice the width. What are the dimensions of the frame? I know that the perimeter is 30 in., the length is 2w-3, and the width is w, but I don't know what to

*asked on October 11, 2015* -
## world geography

what factors account for the simmilarities and differences between the subdivisions in tropical climate zones?

*asked on January 21, 2009* -
## World History

Which options accurately describe cultural practices of the Byzantine and Arab Empires? I think its a and c

*asked on June 11, 2019* -
## social studies

Which member of the Five Civilized Tribes did the Indian Removal Act seem to target the most? A) Apache B) Catawba C) Cherokee D) Iroquois

*asked on April 21, 2017* -
## physics

A surveyor measures the distance across a straight river by the following method. Starting directly across from a tree on the opposite bank, she walks 90 m along the riverbank to establish a baseline. Then she sights across to the tree. The angle from her

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

Assume it takes 6.00 minutes to fill a 45.0 gal gasoline tank. (1 U.S. gal = 231 in.3) I don't know how to solve for part C. (a) Calculate the rate at which the tank is filled in gallons per second. ANSWER: 0.125 (b) Calculate the rate at which the tank is

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

A particle executes simple harmonic motion with an amplitude of 9.00 cm. At what positions does its speed equal two thirds of its maximum speed?

*asked on January 4, 2010* -
## algebra 1

jeff invested $3000 in an account that earns 6.5% intresest , compounded annually. the formula for compound intrest is A(t)=P(1+l)^t

*asked on July 22, 2018* -
## Algebra

Jorge took a trip to Mexico.Upon leaving he decided to convert all of his pesos back into dollars.How many dollars did he receive if he exchanged 42.7 pesos a rate of $5.30 = 11.1 prsos?

*asked on August 22, 2015* -
## Calculus

A 12-ft ladder is leaning against a vertical wall when Jack begins pulling the foot of the ladder away from the wall at the rate of 0.5ft/s. What is the configuration of the ladder at the instant that the vertical speed of the top of the ladder equals the

*asked on October 26, 2014* -
## ap physics

I need some help with the following problems. I got no idea how to do it...PLEASE HELP!!!!THANKS A LOT!! A hunter is standing on flat ground between two vertical cliffs that are directly opposite one another. He is closer to one cliff than the other. He

*asked on March 22, 2008* -
## Chemistry

A 3.68 L sample of methane gas is collected at 36.0 degrees C. Predict the volume of the sample at 0 degrees C.

*asked on May 14, 2018* -
## Math-I don't quite get it.

Rodney has a board that is 5/6 yard long. He uses 1/5 of the board to make a frame. How long is the board used to make the frame?

*asked on March 24, 2015* -
## Chemistry

heating cyclopropane (C3H6) converts it to propene (CH2=CHCH3). The rate law is first order in cyclopopane. If the rate constant at a particular temp is 6.22x10^-4 s^1 and the concentration of cyclopropane is held at .0300 mol/L, what mass of propene is

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

A particle executes simple harmonic motion with an amplitude of 9.00 cm. At what positions does its speed equal two thirds of its maximum speed? I got: v2 +ω^2x^2 =ω^2A^2 vmax =ω A and v = ωA/2?

*asked on January 4, 2010* -
## Chemistry

How to prepare 250ml of 2.5m solution of HCL

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

Determine the partial pressure of oxygen necessary to form an aqueous solution that is 7.7 x 10-4 M O2 at 25oC. The Henry's Law Constant for oxygen in water at 25oC is 1.3 x 10-3 M/atm

*asked on February 7, 2012* -
## chemistry urgent

Draw major product of substitution reaction of (2R,3S)2-bromo-3-methylpentane with CH3CH2O- nucleophile

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

A constant unbalanced force is applied to an object for a period of time. What would the graph look like as acceleration as a function of elapsed time?

*asked on June 7, 2016* -
## Chemistry

What is the complete chemical equation? Al(s) + Cu(CH3COO)2(aq) -> ?

*asked on March 18, 2012* -
## chemistry.

in the titration between Na2CO3 and HCl... 1) at the first end point what reaction is stoiciometrically complete? 2)At the start of titration where HCl=0 is the solution acidic or basic. ExPlain? 3) At the 2nd end point what reaction is stiociometrically

*asked on March 13, 2011* -
## Physics

The water in a river flows uniformly at a constant speed of 2.53 m/s between parallel banks 69.8 m apart. You are to deliver a package directly across the river, but you can swim only at 1.74 m/s. (a) If you choose to minimize the time you spend in the

*asked on October 12, 2009* -
## Elemements of Math

Little Caesar's Pizza had a commercial on television that claimed you could buy one pizza and get another one free, with up to 5 toppings per pizza (do not count the pizza sauce or the cheese as a topping). The dialogue on the commercial went something

*asked on March 7, 2015* -
## Calculus need help badllyyy!

Use the expressions for left and right sums and the table below. right-hand sum = summation (n above and i =1 on the bottom) f(ti) * change in t = f(t1) * change in t + f(t2) * change in t + .... + f (tn) * change in t left-hand sum = summation (n above

*asked on March 13, 2012* -
## Math120

A golf ball is selected at random from a golfn bag. If the golf bag contains 5 red balls, 6 orange balls and 9 black balls, find the probability of the following event. The golf ball is red or orange.

*asked on May 16, 2016* -
## physics

crate weighs 823 N rests on plank that makes a 25 degree angle with the ground. Find components of crate's weight parallel and perpendicular to the plank

*asked on November 18, 2010* -
## Math help quickly

Use the expressions for left and right sums and the table below. right-hand sum = summation (n above and i =1 on the bottom) f(ti) * change in t = f(t1) * change in t + f(t2) * change in t + .... + f (tn) * change in t left-hand sum = summation (n above

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

consider the following reaction: Mg(s)+ 2HCl(aq) --> MgCl2 (aq)+H2 (g) What minimum amount of 1.75 M HCl is necessary to produce 27.5 L of H2 at STP?

*asked on April 26, 2010* -
## Physics

The water in a river flows uniformly at a constant speed of 2.53 m/s between parallel banks 69.8 m apart. You are to deliver a package directly across the river, but you can swim only at 1.74 m/s. (a) If you choose to minimize the time you spend in the

*asked on October 12, 2009* -
## Math in Science

Estimate the thickness of plant matter that produced a bed of coal 0.6 m thick. About how much coal would have been produced from a layer of plant matter 0.50 m thick.

*asked on October 5, 2015* -
## Math

Joel miss 4 out of the 24 problems. What fraction of the problems did he get correct

*asked on December 7, 2015* -
## Maths

A rectangular field is 2.45m long and 1.62m wide. What is the perimeter of the rectangular field

*asked on November 2, 2015* -
## Math

Ariel deposits $5000 in an account that earns simple interest at an annual rate of 3%. Travis deposits $5000 in an account that earns compound interest at annual rate of 3%

*asked on March 8, 2016* -
## Math

Equation: t=5(logP/log0.5) P is the percentage of caffiene in the bloodstream related to t, time elapsed in hours Suppose you drink a cup of coffee at 9:00 a.m. What percentage of the caffiene will remain in your body at noon?

*asked on January 12, 2015* -
## physics

(a) a spherically shaped buoy is made from wood, which has a specific gravity of 0.6. find the acceleration of the buoy when released from rest at the bottom of a freshwater lake. (b) if the buoy starts out 10 m below the surface of the water, determine

*asked on December 1, 2012* -
## calculus

find the centroid of the plane region bounded by the curves y = cos x, y=sinx, x=0,

*asked on October 31, 2011* -
## Calculus

Write the logarithm of a single quantity: 2ln(x)+ln(4)-(1/2)ln(9)

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

Ammonium carbonate decomposes upon heating according to the following balanced equation: (NH4)2CO3(s)-->2 NH3(g)+CO2(g)+H2O(g) Calculate the total volume of gas produced at 25 C and 1.07atm by the complete decomposition of 11.86 g of ammonium carbonate.

*asked on April 16, 2010* -
## Physics

By what factor would you have to decrease the tension in a stretched string in order to decrease the wave speed by a factor of 3.5? I know that v = sqrt(T/u) but am confused as to what to do?

*asked on January 11, 2010* -
## math

The perimeter of a rectangular playground is 40 yards. It is 1.5 yards longer that it is wide. What is area of playground?

*asked on February 11, 2013* -
## biology

21% of a population is homozygous dominant, 49% are heterozygous and 29% are homozygous recessive. if the Hardy-Weinberg Law applies, what percentage of the next generation is predicted to be homozygous recessive?

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

Ammonium carbonate decomposes upon heating according to the following balanced equation: (NH4)2CO3(s)-->2 NH3(g)+CO2(g)+H2O(g) Calculate the total volume of gas produced at 25 C and 1.07atm by the complete decomposition of 11.86 g of ammonium carbonate.

*asked on April 16, 2010* -
## Physics

A proton accelerates from rest in a uniform electric field of 620 N/C. At one later moment, its speed is 1.30 Mm/s (nonrelativistic because v is much less than the speed of light). (a) Find the acceleration of the proton. m/s2 (b) Over what time interval

*asked on February 1, 2010* -
## science

solution A was prepared by dissolving 0.63g of HNO3 in 100cm3 solution. Solution B is a sodium calcium hydroxide solution of unknown concentration. state a balanced chemical equation for the reaction

*asked on August 25, 2015* -
## physics

wave speed: the violin is a four stringed instrument tuned so that the ratio of the frequencies of adjacent strings is 3:2. (This is the ratio when taken as high frequency to lower frequency.) If the diameter of E string (the highest frequency) on a violin

*asked on December 3, 2012* -
## calculus

i'm not sure how to do this. can someone help, please? thanks! consider the function f(x0 = x^2 + 2x on the interval [-2, 2] a. draw a sketch of the graph of f(x). find the average rate of change on the interval [-2, 2] and sketch this secant line. b. find

*asked on November 27, 2011* -
## Precal

Solve the given equation. (Enter your answers as a comma-separated list. Let k be any integer. Round terms to two decimal places where appropriate.) cos θ = 0.16 I know how to find the answers when it's in fraction form, however, I do not know how to do

*asked on November 4, 2015* -
## Trig

Determine exact solution. x E (0, 2pi) 2csc^2x-8=0

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

Jen and Heather went to lunch. When the bill came, Jen discovered that she only had $8. Luckily, Heather had enough money to pay the other part, 3/5 of the bill. How much did Heather pay? How much was the total bill? I'm having a hard time understanding

*asked on December 10, 2012* -
## 4th grade math

what is 5/6 of 288

*asked on March 12, 2012* -
## Algebra

Let A= {3, 7, 2}. List all the subsets of A

*asked on April 4, 2016* -
## Mathamatics

Solve the following trigonometry identities. a) 1-cos2(theta) = sin(theta)cos(theta)/cot(theta) b) (1-cos2(theta))(1-tan2(theta))=sin2(theta)-2sin4(theta)/1-sin2(theta) *its supposed to be cos to the power of two, sin to the power of four, etc. There is

*asked on May 28, 2014* -
## Chemistry

Could you please explain how electronegativity works and how you find the total electronegativity value of PO3 K2O H2S GIVEN: P- 2.1, O-3.5, K- 0.8, H- 2.1, and S- 2.5 Also how to you tell if the compound is ionic, polar covalent, or non polar covalent?

*asked on October 30, 2013* -
## Math

A student wants to display the average monthly temperatre for one year.He chooses a line graph to display the data.Describe and correct the error made in choosing that type of display for the data.

*asked on March 29, 2012* -
## math

Puck is making a scale model of an airplane. The actual airplane is 98 feet long. The scale of the model is 1 cm : 4.7 ft. What is the length of the model? [Round to the nearest hundredth, if necessary.]

*asked on January 4, 2012* -
## Physics

A projectile is launched beneath the straight line path it would follow if there was no gravity. How many metres does it fall below the line if it has been travelling for 1 second? 2 seconds?

*asked on May 14, 2011* -
## Physics

A person walks first at a constant speed of 4.70 m/s along a straight line from point A to point B and then back along the line from B to A at a constant speed of 2.80 m/s. (a) What is her average speed over the entire trip? (b) What is her average

*asked on October 8, 2009* -
## math

Three coins are selected from 10 coins: 4 dimes, 4 nickels, and 2 quarters. In how many possible ways can the selection be made so that the value of the coins is at least 25 cents? I know that the total outcomes equals 120, but how do I find how many of

*asked on February 21, 2009* -
## Music

Can anyone tell me how the basso continuo changed through the baroque to the classical period? Thank you for using the Jiskha Homework Help Forum. Hopefully the following site will help you: http://www.medieval.org/emfaq/misc/continuo.html

*asked on December 28, 2006* -
## Science

Why do scientists not like to use the word “artificial”?

*asked on June 6, 2018* -
## 12 Math

f(x)=2x^4+5x^3-x^2-3x+1 a)Determine the average slope between the points where x=1 and x=3. b)Determine the instantaneous slope at each of these points.

*asked on January 21, 2015* -
## Chemistry

What is the magnitude of the energy change associated with the emission of one mole of photons of light* with this wavelength? light*= 6.231×1014 Hz

*asked on March 3, 2012* -
## Fourth grade math

What's range mean?

*asked on October 27, 2011* -
## Finite Math

A "hand" consists of a set of 5 cards selected from an ordinary deck of 52 cards: (1) How many different hands contain exactly 4 diamonds? = 27885 (2) How many different hands contain exactly 4 cards of the same suit (any of the four suits)? (3) How many

*asked on February 24, 2009* -
## Egypt

What was the importance of Anubis to Ancient Egyptians? The jackal-god of mummification, he assisted in the rites by which a dead man was admitted to the underworld. Anubis was worshipped as the inventor of embalming and who embalmed the dead Osiris and

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

You bought a total of four cans of chicken soup at the grocery store. You paid a total of $3.16 for all four cans. How much did each can cost?

*asked on September 27, 2015* -
## locus

if a moving point p is always equidistant from the point A(2,4) and the line y=-4, find the equation of the locus of p

*asked on July 18, 2015* -
## math-percentage

there are 792 workers in a factory. if the number of male workers is 20%less than that of female workers, then the number of male workers is? answer:352 i always get confused with the equation of this type of quesion. Thanks:)

*asked on July 10, 2015* -
## Math

Ricky needs 3 1/4 cups of sugar to make candy. He already has 2 1/2 cups. How many more cups of sugar does he need? Do you add for this question or subtract? That's all that I need to know.

*asked on March 26, 2015* -
## Math

look for a pattern. write the missing numbers. 3/4, 6/4, 12/4, blank, blank, blank, blank, 384/4, 768/4.

*asked on March 23, 2015* -
## math trig

If a ferris wheel with a 20.5 meter radius, how high would one car be from the loding dock at these given angles trveled by the rider?: 90 135 180 225 270 315 405 450 495 and 540?

*asked on May 9, 2013* -
## Math-Calculus

Consider two ships which are joined by a cable attached to each ship at the water line. Suppose the two ships are 200 metres apart, with the cable stretched tight and attached to a pulley which is anchored halfway between the ships at a depth of 45 metres.

*asked on April 3, 2013* -
## Math-Corrections

Based on the survey,the librarian predicts that about two-thirds of the students in seventh grade will not like the new encyclopedia.Is this answer reasonable? Answer i got:yes

*asked on March 27, 2012* -
## 4th grade math

what is 5/6 of 288

*asked on March 12, 2012* -
## English

For our homework we had to draw and label an imaginary creature, then write an essay on it . I'm completely stuck on the essay bit please he

*asked on October 27, 2011* -
## Math

Info Sean is buying a new DVD player for 315. the store offers him an interest-free payment plan that allows him to pay in monthly installments of $25. Ques. Use n to stand for number of payments and a for the amount still owed. Write an equation for

*asked on September 21, 2010* -
## Economics

Quality Adjusted Life Years evaluates interventions in _____ rather than _____. a. dollars; years b. utility; dollars c. years; dollars d. dollars; utility

*asked on April 19, 2010* -
## math

The hawks won 17 hockey games than they lost. They played 52 games in all and had a 3 ties. how many games did they lose? so 52 ..... games in all won 17......games ties.........3 this is what I do 52 - 17 ------ 35 so they had 35 games left. From here I

*asked on October 8, 2009* -
## year 8 re

i need to find 3 pieces of evidence of what jesus did and 3 things what jesus didn`t do. for the 3 things jesus did i have found feeding the 5000 , walking on water and healing the sick but i am having trouble finding evidence for what jesus did not do.

*asked on September 23, 2008*

## Pages

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