# Katy

Most popular questions and responses by Katy-
## Earth science

1.which evidence would confirm that a given rock layer is newer than the layers around it? It has been crumpled and folded, while the other layers lie flat. Other layers have been deposited above it. It is horizontally-oriented. It cuts through all the

*asked on August 12, 2019* -
## Calculus

If a rock is thrown upward on the planet Mars with a velocity of 14 m/s, its height in meters t seconds later is given by y = 14t − 1.86t^2. Estimate the instantaneous velocity when t = 1.

*asked on October 8, 2011* -
## Math help

In which type of symbiotic relationship is one organism helped while another organism is neither benefitted nor harmed? A: Mutualism B: Predation C: Commensalism D: Parasitism

*asked on February 20, 2019* -
## math please help!!!

The area of the base of the regular quadrilateral pyramid is 36 cm2 and the area of a lateral face is 48 cm2. Find: Surface area of the pyramid

*asked on May 5, 2017* -
## Probability and Statistics

An oil prospector will drill a succession of holes in a given area to find a productive well. The probability that he is successful on a given trial is 0.2. a) What's the probability that that the third hole drilled is the first to yield a productive well?

*asked on September 29, 2013* -
## posibility

Three men and three women are waiting to be interviewed for jobs. If they are all selected in random order find the probability of each event. No man will be interviewed until at least two women have been interviewed.

*asked on November 16, 2012* -
## geometry

What is the perimeter of rectangle WXYZ, with vertices W(-3,7), X(-5,4), Y(1,0), and Z(3,3) to the nearest unit.

*asked on September 15, 2015* -
## Math

Sara and Jenny can both do flips in the air. The ratio of the number of flips Sara can do to the number of flips Jenny can do is 3:8. Jenny can do 120 more flips than Sara. If Sara increases the number of her flips by 3 and Jenny decreases the number of

*asked on November 7, 2015* -
## Probability and Statistics (Continuation)

Assume 10% of the engines manufactured on an assembly line are defective. If engines are randomly selected one at a time and tested. What is the probability that the third nondefective engine will be found a)on the fifth trial? b) on or before the fifth

*asked on September 29, 2013* -
## geometry

Jenny is building a rectangular garden around a tree in her yard. The southwest corner of the garden will be 2 feet south and 3 feet west of the tree. The northeast corner of the garden will be 1 foot north and 4 feet east of the tree. If jenny paves a

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

How does Western Europe's physical geography affect its settlement patterns, economy, and culture? I've looked in the lesson and on google. But all of the websites that look like they might help are blocked. Can someone help, please? I don't need the

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

A car traveling 85km/h slows down at a constant 0.52m/s2 just by "letting up on the gas." Calculate the distance the car coasts before it stops.

*asked on February 8, 2015* -
## Math geometry

Please help , I only need the second part of the question Betty picks 4 random marbles from a bag containing 3 white , 4 yellow and 5 blue marbles The probability that exactly 1 of the 4 marbles drawn is blue is (0.3535) . The probability that at least 1

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

The latent heat of vaporization of water is 540 calories/gram. How many calories are required to completely vaporize 500 grams of water?

*asked on October 12, 2010* -
## Physics

A sample of helium behaves as an ideal gas as it is heated at constant pressure from 273 K to 373 K. If 15.0 J of work is done by the gas during this process, what is the mass of helium present? I am not sure what equations to use for this problem....

*asked on May 4, 2010* -
## prod and oper management

Hahn Manufacturing purchases a key component of one of its products from a local supplier. The current purchase price is $1,500 per unit. Efforts to standardize parts succeeded to the point that this same component can now be used in five different

*asked on September 6, 2014* -
## physics

an astronaut rotates at the end of a test machine whose arm has a length of 10.0m. if the acceleration she experiences must not exceed 5g (g=10m/s^2? what is the maximum number of revolutions per minute of the arm?

*asked on November 8, 2010* -
## chemistry/engineering

Wet sugar, containing one-fifth water by mass is conveyed through an evaporator in which 85.0% of the entering water is vaporized. Taking a Basis of 100 kg of feed to the evaporator A barrel of oil contains about 6 million Btu and about 1000 Btu is needed

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

The temperature T(t) varies sinusoidally on a certain day in December. The minimum temperature is 35 degrees Fahrenheit at midnight. The maximum temperature is 50 degrees Fahrenheit at noon. Let t be the number of hours since midnight (t=o at midnight).

*asked on April 27, 2016* -
## Finance

Dave takes out a 30-year mortgage of 200000 dollars for his new house. Dave gets an interest rate of 16.8 percent compounded monthly. He agrees to make equal monthly payments, the first coming in one month. After making the 68th payment, Dave wants to buy

*asked on September 17, 2011* -
## biology

How can earth's layers be defined? (two answers) by their amounts of land area by their physical properties(this) by their asthenospheres by their chemical compositions(this) by their proximities to the core the chemical one is right but im not sure about

*asked on August 12, 2019* -
## Chemistry

Calculate the solubility of ZnCO3 in a buffer solution with a pH of 9.83 and Ksp of 1.2x10^-10

*asked on April 25, 2017* -
## Algebra 2

There are two spinners. Each spinner is numbered 1-4. Each spinner is spun once. Find the probability of spinning each of the following:2 on the first spinner and a 4 on the second spinner, both numbers the same, 3 on exactly one spinner, one number less

*asked on February 1, 2012* -
## Social studies

How has Aztec culture survived in Mexico? The Mexican military uses Aztec fighting tactics. Mexico still uses the Aztec calendar. The Mexican people have adopted many Nahuatl words into their language. My choice An Aztec Palace in Mexico city serves as the

*asked on January 15, 2016* -
## Science

Which of the following statements is true? A. There is more water on Earth now than there was millions of years ago. B. There is less water on Earth now than there was millions of years ago. C. There is no way to tell how much water was on Earth millions

*asked on April 19, 2015* -
## math

Alottery has 100 tickerts which are placed in a barrel . Three tickets are drawn at random from the barrel to decide 3 prizes . If john has 3 tickets in the lottery , determine his probability of winning : A.first prize. B.first and second prize. C.all 3

*asked on September 24, 2012* -
## Probability and Statistics

The proportion of adults living in a small town who are college graduates is estimated to be p = 0.6. To test this hypothesis, a random sample of 15 adults is selected. If the number of college graduates in the sample is anywhere from 6 to 12, we shall not

*asked on November 30, 2013* -
## Algebra

A rain gutter is made from sheets of aluminum that are 11 inches wide. As shown in the figure the edges are turned up to form right angles. Determine the depth of the gutter that will allow a cross-sectional area of 10 in.². Show that there are two

*asked on September 11, 2017* -
## Geography/History

Incidents of Basque violence are caused by their desire for _____. 1) educational opportunities 2) improved health care 3) increased wages 4) independence I think it is 4. I just want to know if I am right. help?

*asked on October 15, 2010* -
## Fluid Mechanics

Water flows into a cylindrical tank through pipe 1 at a rate of 25 ft/s and leaves through pipe 2 at 10 ft/s and through pipe 3 at 12 ft/s. Pipe 4 is an open air vent. Internal diameters of the pipes are: D1=3 in, D2= 2 in, D3=2.5 in, D4=2 in. Calculate a)

*asked on September 10, 2013* -
## chemistry

Flask A contains 100 milliliters of a solution with a pH of 5. After you add 100 milliliters of a solution from Flask B, the pH rises to 7. What was the pH of the solution in Flask B?

*asked on September 5, 2014* -
## Math help!

Simplify the expression (n^4)^8 A. n^(48) B. n^(32) C. n^(12) D. n^4

*asked on February 12, 2019* -
## PreCalc

As you ride a bicycle, the distance between your foot and the pavement varies sinusoidally with the horizontal distance the bicycle has gone. Suppose that you start with your right foot somewhere between a high point and a low point, and push down. When

*asked on April 27, 2016* -
## science

At which type of plate boundary would a string of small volcanic islands most likely form? convergent ocean-land boundary**** convergent ocean-ocean boundary transverse boundary divergent ocean-ocean boundary

*asked on September 15, 2019* -
## Chemistry

The electron configuration for Europium? I think it's 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f7 Is that right? I'm not sure if I did it right with the f block.

*asked on March 10, 2008* -
## Math Helpppp

The College Board, which are administered each year to many thousands of high school students, are scored so as to yield a mean of 550 and a standard deviation of 100. these scores are close to being normally distributed. what percentage of the scores can

*asked on February 23, 2013* -
## math URGENT HELPPPP!

Regular triangular pyramid has the slant height k=12 cm and lateral area AL = 198 cm2. Find the length of the base edge.

*asked on April 30, 2017* -
## Chemistry

What is the name of the compound PBr5 using the Stock system?

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

A movie theater manager wants to know how many adults and how many children pay admission to a particular movie. The theater charges $10.00 for adult tickets and $5.00 for child tickets. At a showing where 210 tickets were sold the theater collected

*asked on March 25, 2012* -
## Algebra

The first step to solve for y in y/3= 6 + x is A) to subtract x from both sides of the equation. B) to subtract y/3 from both sides of the equation. C) to divide each term on both sides of the equation by 3. ******* D) to multiply each term on both sides

*asked on September 8, 2019* -
## math URGENT HELP!!!

The area of the base of the regular quadrilateral pyramid is 36 cm2 and the area of a lateral face is 48 cm2. Find: Lateral area of the pyramid

*asked on May 4, 2017* -
## physics

The relative humidity is 55% on a day when the temperature is 30.0°C. Using the graph below, determine the number of moles of water vapor per cubic meter of air

*asked on March 4, 2012* -
## Geography/History

Multiple select. The dissolution of the Union of Soviet Socialist Republics _____. 1) had no effect on the United States 2) affected nations throughout the world 3) reduced the number of Communist nations in the world 4) increased the number of Communist

*asked on October 15, 2010* -
## Social studies

How could a poll tax or a literacy test has been used to prevent someone from voting? The Civil war Amendments Before. After

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

Light travels at a speed of 186,282 miles per second. How could this number be expressed in scientific notation? 1)1,862.82 x 10 x10 x10 2)1.86282 x 10 x10 x 10 x10 x10 3)1.86282 x 10 x10 x10 x10 4)186.282 x -10 x-10 x -10

*asked on February 1, 2012* -
## chemistry

8.00g of NaOH are dissolved in water to make 4.00 of solution. What is the concentration of hydronium ions, , in this solution?

*asked on November 2, 2009* -
## spanish

How do I translate my spanish Thank you for using the Jiskha Homework Help Forum. First of all you need to determine the vocabulary in the sentence. When you actually post some work here we can help you use the dictionary. The very BEST way is to look up

*asked on August 29, 2006* -
## Algebra

1.)Which of the following statements is true? Positive numbers are always rational numbers. Negative numbers are always irrational numbers. Negative numbers are sometimes rational numbers.********* Negative numbers are always integers.

*asked on January 3, 2019* -
## Geometry

Show the conhecture is false by finding a counterexample... 1. The differnece of the absolute value of two numbers is positive meaning /a/ - /b/ > 0 I do not get that.... =/ HELP. If absolute value of a is greater than the absolute value of b, then the

*asked on August 14, 2007* -
## Algebra

1.)which of the following is an irrational number? 6.444..... 21/square root(16) 5π/π **** btw these are pi signs π

*asked on January 3, 2019* -
## Algebra

Evaluate 5(14-2^3)+8÷2 26* 34 44 56

*asked on August 8, 2018* -
## Algebra

1.) Which of the following numbers could be added to 3/16 to make a sum greater than 1/2? 5/16 10/32 2/6 1/4 Which of the following pairs of numbers provides the best estimate of (square root of 45)? (square root of 25) and (square root of 36 (square root

*asked on January 3, 2019* -
## algebra

Is 84/105 and 128/160 proportional? please explain im so stuck.

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

When Jonell checked the temperature in the morning, he saw that it was -4F. Late that afternoon, the temperature was 15F. Select the equation that represents this situation. -4+x=15;x=The number of degrees the temperature rose -4+x=15;x=The current

*asked on August 27, 2018* -
## Probability and Statistics

The proportion of adults living in a small town who are college graduates is estimated to be p = 0.6. To test this hypothesis, a random sample of 15 adults is selected. If the number of college graduates in the sample is anywhere from 6 to 12, we shall not

*asked on November 27, 2013* -
## IPC

The specific heat of gold is 0.031 calories/gram°C and the specific heat of silver is 0.057 calories/gram°C. If equal amounts of each metal are exposed to equal heating, which will heat up faster? The answers are: 1) The silver will heat up almost twice

*asked on October 13, 2010* -
## Algebra

Explain patterns in the placement of the decimal point when multiplying 5 by 10^2, 10 ^1 and 10^0. Please explain i'm not very good with math.

*asked on October 3, 2018* -
## geometry

Jk=6r,kl=3r and jl = 27

*asked on October 7, 2013* -
## algebra

joey and helen are standing in opposite corners of a rectangular field. if the field has dimensions 120ft by 209 ft, how far apart are they? Please help me solve this and lead me through the problem , thank you. :)

*asked on November 5, 2018* -
## Algebra 2

There are two spinners. Each spinner is numbered 1-4. Each spinner is spun once. Find the probability of spinning each of the following: a 3 on both spinners, 1 on one spinner and a 3 on the other, both numbers less than 4, 3 on at least one spinner.

*asked on February 1, 2012* -
## World Geography

Which statement describes negative population growth? A) Fewer people are born than die during a given period. B) Fewer people die than are born during a given period. C) More people are born than die during a given period. D) More people die than are born

*asked on January 25, 2011* -
## Algebra I

Match expressions from this list that are equivalent but written in different forms. There can be multiple matches. I know that there is a group of 3, and a group of 2, matching expressions. Here are the expression-I need help figuring out how to go about

*asked on March 3, 2009* -
## Math help!

Simplify: (3cd^4)(-2c^2)(5cd^3) A: 6c^4d^7 B: -30c^4d^7 C: 6c^2d^7 D: -30c^2d^7 I am completely clueless on what the answer would be, help appreciated ;-;

*asked on February 21, 2019* -
## math

Julia spent 1/3 of her money. Then she lost 1/2 of the rest. She now has $10 left. How much did she get for her birthday?

*asked on September 2, 2015* -
## earth

if the radius of the earth's orbit around the sun is 93,000,000 miles, what is the speed of the earth in it's orbit in miles per hour?

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

The endpoints of the diameter of a circle are at (1,2) and (7,-6). What is the circumference of the circle, to the nearest tenth of a unit.

*asked on September 15, 2015* -
## Biology

Fats are excellent energy storage molecules because a) they have a relatively high ratio of energy storing C—H bonds. b)they have a relatively high ratio of energy storing C=O bonds. c)they are hydrophobic and do not easily mix with water. d)they have a

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

-6q+5.8=23.8 q=3 q=-3*** q=-1.83 q=4.93 This is my last question, but I just want to know how to solve it with steps for further knowing.

*asked on January 7, 2019* -
## algebra

7x/8=21 a. 24**** b. 18.375 c. 1.857 d. 19 Im not very sure how to solve this.

*asked on January 7, 2019* -
## algebra

Solve the formula for the variable given.Then use the given information to find the value of the variable. A=2πrw Find r if w=4ft And A=120ft square. Please someone help me with this!!!

*asked on August 22, 2013* -
## Algebra

Write a system of inequalities to describe the shaded area of the graph. This is the question on my homework today that i just don't get. My teacher said to use point slope form. y=y1+m(x-x1) The coordianate points of the triangular area are line 1:

*asked on February 12, 2009* -
## Material science/ Mechanics

A cube polymer matrix is subjected to elastic deformation in compression by 10 N applied force. The cube is deformed by 20% of its original shape. The cube side has a length of 1 m. If you assume that the polymer has the intrinsic properties of rubber,

*asked on September 8, 2013* -
## chemistry

sorry i forgot some of the units in the initial posting 8.00g of NaOH are dissolved in water to make 4.00L of solution. What is the concentration of hydronium ions, , in this solution?

*asked on November 2, 2009* -
## Algebra

An office manager reported that he spent $350 on gifts for employees. He said that $240 was spent on clothing with each man receiving a $20 T-shirt and each woman receiving a $40 sweatshirt. He said that $110 was spent on desk accessories with each man

*asked on May 16, 2019* -
## physics

A police car is traveling at a velocity of 19.0 m/s due north, when a car zooms by at a constant velocity of 49.0 m/s due north. After a reaction time 0.600 s the policeman begins to pursue the speeder with an acceleration of 6.00 m/s^2. Including the

*asked on September 15, 2013* -
## english

Although the trend is shifting, careers in science and technology continue to attract predominately men.

*asked on September 29, 2011* -
## physics

an astronaut rotates at the end of a test machine whose arm has a length of 10.0m. if the acceleration she experiences must not exceed 5g (g=10m/s^2? what is the maximum number of revolutions per minute of the arm?

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

Which operation should be performed first in the expression? 5+7÷7x4-17 Addition Subtraction Multiplication Division***** **Is my answer

*asked on September 2, 2018* -
## Algebra

Write and solve an equation that represents the following situation 35 people paid a total of 245 for admission to a local soccer game. What is the price of admission. Please help im stuck.

*asked on September 2, 2018* -
## astronomy

the radius of earth is 4000 miles, how far would you travel in going around the equator?

*asked on September 10, 2011* -
## math asap

Solve the proportion using cross products. 8/20 = k/110 (A)99*^* (B)122 (C)3.3 (D)2.9 Am I correct? please asap

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

can anyone show me the steps to convert to scinctific notation of these two problems: .000316 which the answer is 3.16x10^-4 and 0.000517 which the answer is 5.17x10^-4

*asked on September 20, 2011* -
## physics

an astronaut rotates at the end of a tesr machine whose arm has a length of 10.0m. if the acceleration she experiences must not exceed 5g (g=10m/s^2? what is the maximum number of revolutions per minute of the arm?

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

1. Identify the graph(s) whose line may have the given slope. Then, describe your strategy for matching the graphs to the given slopes. a.1/4 b.0 c.5/4 d.-3

*asked on October 14, 2019* -
## Algebra

Question 2 w=10, what is the answer to w+(w-12÷2^2•3)•7 73 66 23 17* Question 3 14-3•4÷6 14 12* 6 3 Question 4---which algebraic expression represents the following:the sum of four times a number and six? 4(x+6) 4(x•6)* 4x+6 x+4•6

*asked on August 8, 2018* -
## physics

when maggie applies the brakes of her car, the car slows uniformly from14.3 m/s to 0 m/s in 2.18 s. How far ahead of the stop sign must she apply her brakes in order to stop at the sign? answer in m

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

A tennis ball is struck and departs from the racket horizontally with a speed of 29.1 m/s. The ball hits the court at a horizontal distance of 19.0 from the racket. How far above the court is the tennis ball when it leaves the racket?

*asked on September 15, 2013* -
## Algebra I - Answer check

2. a) 7^12/7^4 = 7^8 b)x^11/x^5 = x^6 c)12x^5/3x^2 = 4x^3 d)7x^6y^3/14x^3y = .5x^3y^2 5. a) (2x)^3(3x^2)^4 = 648x^11 b)(5x)^7/(5x)^4 = 25x^2 c)(2x)^5/-8x^3 = -4x^2 d)(4x^2y^5)(-3xy^3)^3 = -12xy^4 6. How long does it take light to travel from the Sun to

*asked on March 9, 2009* -
## Algebra

Find the solution to the system of equations by using either graphing or substitution. y+x=3 y-2x=18 (-4.5,7.5) (-5,8) (-6,9) (-7.5,10.5)

*asked on May 16, 2019* -
## Probability and Statistics

The proportion of adults living in a small town who are college graduates is estimated to be p = 0.6. To test this hypothesis, a random sample of 15 adults is selected. If the number of college graduates in the sample is anywhere from 6 to 12, we shall not

*asked on November 28, 2013* -
## physics

A 50.0 kg gymast hangs vertically from a pair of parallel rings. If the ropes are supported so that they make an angle of 45 degrees with the ceiling, what is the tension in each rope?

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

Which table represents a function? x|3|-1|1|-1 y|0|4|2|-2 ________ x|0|1|0|2 y|2|3|0|3 _______ x|-2|2|4|-2 y|5|1|5|5 _______ x|5|4|5|1 y|1|5|4|5 I am not sure how to know. So please explain so next time I can know how :).

*asked on April 2, 2019* -
## science

A protostar has a high enough___to become a star. A. volume B. mass C. temperature D. brightness Is the answer B? Thanks in advance

*asked on April 9, 2015* -
## chemistry please help i cant figure this out

What is the total mmHg pressure in of a gas mixture containing argon gas at 0.25atm , helium gas at 385mmHg , and nitrogen gas at 345torr. ? sorry i didn't relize i left them out.

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

7+8x=-33 How can I solve this? with steps please.

*asked on January 15, 2019* -
## Probability and Statistics

Assume 10% of the engines manufactured on an assembly line are defective. If engines are randomly selected one at a time and tested. What is the probability that the third nondefective engine will be found a)on the fifth trial? b) on or before the fifth

*asked on September 29, 2013* -
## Math

An 8 meters bamboo pole is leaning against a coconut tree. The foot of the pole is 3 meters from the base of the tree. What angle does the pole make with the tree if the pole reaches up to the top of the tree? HELP PLEASE!

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

I'm supposed to do this for an organic chemistry prelab. I've read my books and tried Googling everything possible, but I still don't know how to set this up. Please help! The solubility of a certain compound in ice-cold water is 0.18g in 100 mL. Its

*asked on September 29, 2011* -
## Equation/Algebra

-2x+5(x+3)=-9 Can someone help me solve this step by step?

*asked on February 19, 2019* -
## Chemistry

Calculate the ZnCO3 in a buffer solution with a pH of 9.83

*asked on April 25, 2017*