# Jonathan

Most popular questions and responses by Jonathan-
## life orientation

Define risk behavior and explain why it is important for teenagers to investigate and be knowledgeable about it.

*asked on August 21, 2015* -
## Science

1. Aquaculture is the practice of farming sea organisms as a renewable food source. A. True B. False. 2. Selectively cutting down trees on an area of land can be best described as A. cutting down certain trees while leaving other trees standing B. cutting

*asked on February 3, 2014* -
## Organic Chemistry

What is the white solid that quickly forms when the methyl salicylate is added to the sodium hydroxide solution? I know that it is this equation but I wanted to know what is the name of the white solid: HOC6H4COOCH3 + NaOH „³ HOC6H4COO- Na+ + CH3OH

*asked on April 3, 2010* -
## stoichiometry

Ammonia gas reacts with oxygen gas according to the following equation: 4NH3 + 5O2----4NO + 6H2O a. How many moles of oxygen gas are needed to react with 23 moles of ammonia? (29 mole) b. How may grams of NO are produced when 25 moles of oxygen gas react

*asked on February 9, 2011* -
## Help with science

1. Aquaculture is the practice of farming sea organisms as a renewable food source. A. True B. False. 2. Selectively cutting down trees on an area of land can be best described as A. cutting down certain trees while leaving other trees standing B. cutting

*asked on February 3, 2014* -
## Social Studies

1. In the AD 600s, North africa was conquered by A. Egyptians B. Arab Muslims C. Europeans D. Africans from south of the Sahara

*asked on November 1, 2017* -
## Geometry

A photographer enlarged a picture. If the width of the image is 5 inches and the width of the pre-image was x, what is the scale factor for the dilation in terms of x?

*asked on January 5, 2016* -
## Probability

Consider 10 independent tosses of a biased coin with the probability of Heads at each toss equal to p, where 0

*asked on March 3, 2015* -
## Biology

Based on current evidence, what process most accurately describes how chloroplasts and mitochondria evolved? a.photophosphorylation b.endosymbiosis c.photosynthesis d.cellular respiration I personally think the answer is d.

*asked on March 5, 2019* -
## Calculus

The position of a particle on the x-axis at time t, t > 0, is s(t) = ln(t) with t measured in seconds and s(t) measured in feet. What is the average velocity of the particle for 1 ≤ t ≤ e? a)1 b)e c)e-1 d)1/(e-1)

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

Two perpendicular forces have a resultant of 13N.if one of the forces is 5N, the other force is?

*asked on March 11, 2017* -
## social studies

Which of these were holy Hindu scriptures written by gurus to help connect people to heavenly forces?

*asked on November 4, 2018* -
## maths

express log9 in terms of log3 x and log3 y and solve for x and y simultaneously

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

HOW DO I DO THIS PLZ HELP I DON'T NEED U TO SOLVE I JUST NEED TO KNOW HOW Salmon often jump waterfalls to reach their breeding grounds. Starting 2.65 m from a waterfall 0.584 m in height, at what minimum speed must a salmon jumping at an angle of 25.2 ◦

*asked on October 28, 2013* -
## ap geometry

m is the midpoint of segment jk. jm=x/8 and jk=3x/4 subtracted by 6. find mk

*asked on September 3, 2012* -
## Math

I need help on a quiz it is called mid unit review for 7th grade

*asked on September 20, 2018* -
## Calculus

The driver of a car traveling at 60 ft/sec suddenly applies the brakes. The position of the car is s(t) = 60t − 1.5t^2, t seconds after the driver applies the brakes. How many seconds after the driver applies the brakes does the car come to a stop? a)60

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

A particle is moving along the x-axis so that its position at t ≥ 0 is given by s(t)=(t)In(2t). Find the acceleration of the particle when the velocity is first zero. a)2e^2 b)2e c)e d)None of these Any help is greatly appreciated

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

A daredevil jumps a canyon 10.6 m wide. To do so, he drives a car up a 19° incline. (The daredevil lands on the other side of the canyon at the same elevation as takeoff.) What minimum speed must he achieve to clear the canyon?

*asked on October 21, 2010* -
## Calculus

A particle moves with velocity function v(t) = 2t^2 − 3t − 3, with v measured in feet per second and t measured in seconds. Find the acceleration of the particle at time t = 2 seconds. a)3/4 feet per second^2 b)-1 feet per second^2 c)32 feet per

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

If 500 feet of fencing is used to enclose a rectangular plot of land that borders a river, what is the maximum area that can be enclosed? Answer to two decimal places.

*asked on December 12, 2015* -
## Statistics

The time per week a student uses a lab computer is normally distributed, with a mean of 6.2 hours and a standard deviation of 0.9 hour. A student is randomly selected. a. Find the probability that a student uses a lab computer less than 4 hours per week.

*asked on November 30, 2012* -
## chemistry

what volume of glycerine C3H8O3, with a density of 1.26 g/mL should be taken to obtain 2.50 ml of glycerine?

*asked on April 17, 2016* -
## Pre-Calc

Please check my answers I really need to do my homeowrk!;This are polar coordinates we're studying-I'm almost positive the first two are correct. 1.Which of the folowing is another representation of (-3,pi)? (3,120degree) (3,0 degree)I think it is this

*asked on September 27, 2011* -
## physics

A force F applied to an object of mass m causes it to move in a straight line a distance D during an interval of time T. The object gains kinetic energy K during this interval. In which of the following cases will the object gain the same kinetic energy K?

*asked on May 21, 2018* -
## Health

How might a forest fire affect the health of people in nearby communities? (Select all that apply.) a. increased risks of asthma attacks b. increased risks of viral infections c. increased risks of bacterial infections d. increased risks of heart problems

*asked on May 14, 2018* -
## math

Find the area of the rhombus. Round to the nearest tenth if necessary. M(0,4), N(3,0), P(0,-3), Q(-3,0)

*asked on April 4, 2018* -
## Math

Jean has $280 in her savings account starting next week she will deposit $30 in her account every week is the amount of money in her account proportional to the number of weeks. Thank you for helping

*asked on October 16, 2016* -
## fourth grade math

1\2,4\9,4\18 find equivalent fractions with a common denominator and order from least to greatest

*asked on December 14, 2010* -
## Math

In lowest gear on a 10-speed bike, each turn of the pedals makes the wheels turn 3.4 times. In the highest gear, each turn of the pedals makes the wheels turn 1.8 times. With each turn of the wheels, the bike travels 6.5 feet. How much farther does the

*asked on September 24, 2012* -
## Math

In a class of 20 students, 40% are boys. Twenty-five percent of the boys and 50% of the girls wear glasses. How many students wear glasses?

*asked on March 6, 2018* -
## Science Help!

3. Using coal for fuel releases pollution into the atmosphere. Why do people continue to use coal if it causes pollution? A. Using more coal reduces the amount of pollution from using oil B. Using coal is relatively inexpensive. C. Mining coal helps

*asked on February 3, 2014* -
## physics

A daredevil jumps a canyon 10.6 m wide. To do so, he drives a car up a 19° incline. (The daredevil lands on the other side of the canyon at the same elevation as takeoff.) What minimum speed must he achieve to clear the canyon?

*asked on October 21, 2010* -
## physics

A putting green is located 240ft horizontally and 64ft vertically from the tee. What must be the magnitude and direction of the initial velocity if a ball is to strike the green at this location after a time of 4 seconds?

*asked on January 27, 2011* -
## Geometry

Point $G$ is the midpoint of median $\overline{XM}$ of $\triangle XYZ$. Point $H$ is the midpoint of $\overline{XY}$, and point $T$ is the intersection of $\overline{HM}$ and $\overline{YG}$. Find the area of $\triangle MTG$ if $[XYZ] =150$.

*asked on April 21, 2016* -
## Chemistry

The nuclide 12 N 7 is unstable. What type of radioactive decay would be expected??? my guess is either gamma or beta. are either of those correct?

*asked on March 4, 2008* -
## physics

wo packages at UPS start sliding down the ramp shown in the figure. Package A has a mass of 4.50 and a coefficient of kinetic friction of 0.190. Package B has a mass of 10.5 and a coefficient of kinetic friction of 0.170.

*asked on February 20, 2012* -
## 10th Grade Math

A history class is comprised of 6 female and 9 male students. If the instructor of the class randomly chooses 5 students from the class for an oral exam, what is the probability that 2 female students and 3 male students will be selected? Round your answer

*asked on August 30, 2016* -
## Physics

Emily takes a trip, driving with a constant velocity of 79.5 km/h to the north except for a 22 min rest stop. If Emily's average velocity is 68.8 km/h to the north, how long does the trip take?

*asked on September 24, 2011* -
## Math

A spinner is divided into 8 equal sections. Each section is numbered 1-8. Find each probability for one spin.

*asked on January 19, 2017* -
## Statistics

Determine which of the four levels of measurement (nominal, ordinal, interval, ratio) is most appropriate. Student's grades - A, B, or C, on a test.

*asked on June 26, 2011* -
## music

what do neumes above text represent?

*asked on May 31, 2019* -
## Chemistry

A 5.0g KBr sample, at 25 degrees celsius, dissolved in 25 ml of water, also at 25 degrees celsius. the final equilibrium temperature of the resulting solution is 18.1 degrees celsius, What is the enthalpy change in J/g and KJ/mole of KBr.

*asked on November 14, 2012* -
## Math

Solve the equation. 100^(5x+2)=1000^(4x-1)

*asked on March 14, 2018* -
## Life orietation.

The powers of the police during a protest.

*asked on May 21, 2015* -
## calcus

A car travels 6 miles north and then turns right and travels 8 miles east to reach the garage. What is the straight line distance between the starting point and the garage?

*asked on June 26, 2014* -
## Pre-Calc

I posted yesterday and didn't get a response so I'm hoping someone can check these today-Thank you they are polar coordinate questions--My answers are her I just need them checked- 1.Which of the folowing is another representation of (-3,pi)? (3,120degree)

*asked on September 28, 2011* -
## physics please help

A golfer, driving a golf ball off the tee, gives the ball a velocity of +40 m/s. The mass of the ball is 0.045 kg, and the duration of the impact with the golf club is 4.05E-3s. (a) What is the change in momentum of the ball? (b) Determine the average

*asked on November 5, 2010* -
## STATS

Scientists wish to test the mind-readiing ability of a person who claims to have ESP. They use five cards with different and distinctive symbols( square, cicrle, triangle, line, squiggle). Someone picks a card at random and thinks about the symbol. The

*asked on October 17, 2011* -
## Calculus

Givenƒ(x) = ex, verify that lim h->0 (e^x+h - e^h)/h + e^x and explain how this illustrates that ƒ′(x) = ln e • ƒ(x) = ƒ(x)

*asked on July 22, 2015* -
## Physics

a golf ball is shot from a tee which is located 18.0m above the green. The initial velocity of the golf ball is 42.0 m/s at an angle of 50.0 degrees above the horizontal. The ball behaves as an ideal projectile during its flight from the tee to the

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

A heavy wooden block rests on a flat table and a high-speed bullet is fired horizontally into the block, the bullet stopping in it. How far will the block slide before coming to a stop? The mass of the bullet is 9.5 g, the mass of the block is 10.5 kg, the

*asked on November 6, 2013* -
## Chemistry

What is the change in entropy when 9.30 mL of liquid benzene (C6H6, d = 0.879 g/mL) is burned in the presence of 37.2 L of oxygen gas, measured at 298 K and 1 atm pressure? 2C6H6(l) + 15O2(g) → 12CO2(g) + 6H2O(l); ∆S° = –437.7 J/K at 298 K

*asked on April 11, 2015* -
## PAVCS

How many moles of gas are in a 20 liter scuba canister is 300k and pressure is 200 atm

*asked on January 26, 2018* -
## Calculus

A particle moves along the x-axis so that at any time t, measured in seconds, its position is given by s(t) = 5cos(t) − sin(3t), measured in feet. What is the acceleration of the particle at time t = π seconds?

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

The position of a toy locomotive moving on a straight track along the x-axis is given by the equation: x=t^4-6t^2+9t where x is in meters and t is in seconds. The net force on the locomotive is equal to zero when t is equal to Answer in units of s.

*asked on September 27, 2013* -
## math

a farmer bought chickens, goats and sheep. He bought 100 animals and spent $100. how much of each animal did he buy a farmer bought chickens, goats and sheep. He bought 100 animals and spent $100. how much of each animal did he buy I assume he bought all

*asked on August 18, 2005* -
## U.S History

Don't You Push Me Down Words and Music by Woody Guthrie Well you can play with me And you can hold my hand. We can skip together Down to the Pretzel man You can wear my mommy's shoes Put on my daddy's hat You can even laugh at me But don't you push me

*asked on March 2, 2016* -
## Physics

PLEASE HELP WITH AS MANY AS POSSIBLE... I AM TERRIBLY CONFUSED. 1. A charge moves a distance of 1.7 cm in the direction of a uniform electric field having a magnitude of 200 N/C. The electrical potential energy of the charge decreases by 9.69095 × 10−19

*asked on February 16, 2010* -
## lively

Suppose that four times the square of a number equals 20 times that number. Whatis the number? It'll take you 45 seconds if you just plug in a few numbers Again -- putting the subject in the subject line helps. =) 4 n^2 = 20n zero is one solution. Solve

*asked on November 26, 2006* -
## Using Geometry in Probability

Allen and Bethany each arrive at a party at a random time between 1:00 and 2:00. Each stays for 15 minutes, then leaves. What is the probability that Allen and Bethany see each other at the party?

*asked on July 6, 2018* -
## chemistry

Determine the limiting reactant for this reaction if 3.027 grams of Aluminum are reacted with 60.00 mL of a solution that is 6 M KOH. Determine the amount of KAl(SO4)2•12 H2O that can be produced from this reaction. Molar mass Alum = 474 g/mol 2 Al (s) +

*asked on March 29, 2015* -
## Chemistry

Phosphorous trichloride (PCl3) is produced from the reaction of white phosphorous (P4) and chlorine: P4(s) + 6Cl2(g) ! 4 PCl3(g) . A sample of PCl3 ofmass 280.7 g was collected from the reaction of 70.86 g of P4 with excess chlorine. What is the percentage

*asked on March 23, 2011* -
## economics

Suppose that the consumption function is C=100+.8(y-t). Initially investment and government expendtures are I=75 and G=150 and taxes are T=50. 1.Depict this economy using the keynesian cross. calulate the initial equilibrium income. how much will income

*asked on February 6, 2010* -
## Documenting a website for research paper

I cant find it in my text book, can someone tell me how you document a website for the bibliography. also in parenthetical foot note things in the paper do you just use the author of the website? oh also, if the site doesnt tell the author??? (Broken Link

*asked on July 2, 2007* -
## Health

Why are routine screenings for cervical cancer important? (Select all that apply.) a. Cervical cancer screenings guarantee a longer life. b. Cervical cancer screenings can identify precancerous cells. c. They can identify cancer cells before symptoms

*asked on May 14, 2018* -
## science

CH3CH2CHO + 2Ag(NH3)2OH = CH3CH2COONH4+2Ag+H20+3NH3 yield of Ag obtained = 75% calculate minimum mass of propanal that must have been used to form 5g of silver

*asked on January 31, 2013* -
## Chemistry

What's the resulting solution if 2000cm3 of 1MH2S04 is mixed with 20cm3 of 1M NaOH? i got 0.5M,acidic in concentration.

*asked on March 10, 2017* -
## physics

A(n) 3.46 g bullet is fired into a(n) 2.4 kg ballistic pendulum and becomes embedded in it. The acceleration of gravity is 9.8 m/s2 . If the pendulum rises a vertical distance of 7.13 cm, calculate the initial speed of the bullet.

*asked on October 27, 2010* -
## math

Given the coordinates of the vertices of a quadrilateral, determine whether it is a square, a rectangle or a parallelogram. Then find the area of the quadrilateral. E(–7, –1), F(2, –1), G(–4, –8), H(5, –8)

*asked on April 4, 2018* -
## Biology

What's the largest and most successful kingdom in the animal kingdom?

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

Two trains leave the station at the same time, one heading east and the other west. The eastbound train travels 12 miles per hour slower than the westbound train. If the two trains are 400 miles apart after 2 hours, what is the rate of the eastbound train?

*asked on June 29, 2016* -
## Chemistry

When 100 mL of 0.60 M Na2CO3 (aq) is combined with 500 mL of 0.060 M Ba(NO3)2(aq), a precipitate is observed. What is the equilibrium concentration of Ba2+(aq) at 25°C?Ksp(BaCO3) = 8.1 x 10-9

*asked on April 24, 2014* -
## Chemistry

What is the balanced equation between mannitol and boric acid

*asked on October 2, 2019* -
## Geometry

10. Which of the following quadrilaterals always have diagonals that are congruent. Circle all that apply Parallelograms Rectangles Rhombi Squares Isosceles trapezoids 19. Given square ABCD: if the measure of angle ACB = (1x - 32) degrees, find the value

*asked on February 7, 2018* -
## Honors Physics

A plane traveling at 300.0 km/h attempts to land on a 500 m runway. The plane’s engines and brakes accelerate uniformly at –5.0 m/s2. Will the plane be able to land safely?

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

what is the largest domain of the following functions f(x)=3x-5 f(x)=square root of (x+4) f(x)= 2 over x-4 f(x)= sqaure root of (x2-9) f(x)= 2 over x(x+7) Hopefully you've solved these by now. I just noticed the question and see there's no reply. The

*asked on September 1, 2006* -
## science-Help!

What does it mean in the scientific method that the second step is research? I need to write up the 5 steps of scientific method explaining my experiment-how do i do research?

*asked on March 11, 2012* -
## Algebra

How to write an equation for this problem: A boat rental company charges a $5 usage fee and $10 an hour to rent a canoe. How long did you rent the canoe if you were charged $45?

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

10. Which of the following quadrilaterals always have diagonals that are congruent. Circle all that apply Parallelograms Rectangles Rhombi Squares Isosceles trapezoids 19. Given square ABCD: if the measure of angle ACB = (1x - 32) degrees, find the value

*asked on February 6, 2018* -
## Ap physics 1

The mass of a star in a galaxy far, far away, is 3.12 × 105 Earth masses, and the mean distance from the center of this star to the center of a planet with the same mass as our Earth is 2.46 × 108 km. Treating this planet and star as particles,with each

*asked on December 11, 2015* -
## Applied Reseach

For my research paper I wrote about the affects of music on standardized test scores. Basically I tracked scores of elementary and middle schoolers. I compared those who participate in music and those who didn't (quantitative research). Then i wrote a

*asked on December 4, 2010* -
## Redox Half Reactions

Half reaction of 2 Al2O3 + 3 C → 4 Al + 3 CO2

*asked on May 24, 2008* -
## Algebra

-2y + 6x + 2 = 0 y= -4 - 2x

*asked on November 12, 2018* -
## Calculus

A 13 foot ladder is leaning against the house when it's base starts to slide away. By the time is 12 feet from the house the base is moving at the rate of 5 ft/sec. 1.How fast is the top of the ladder sliding down the wall at that moment? 2. At what rate

*asked on October 16, 2014* -
## Pre-Calc P lease check

Please check my answers; 1.Which of the folowing is another representation of (-3,pi)? (3,120degree) (3,0 degree)I think it is this one?? ((-3,0 degree) 2.Which is not a representation of (5,150 degree) (-5,-30 degree)I think it is this one? (-5,330

*asked on September 27, 2011* -
## math question corrected

a farmer bought chickens, goats and sheep. the cost of a chicken is .50 goat is $3.50 and sheep is $10 He bought 100 animals and spent $100. how many of each animal did he buy please help! I need this for school tomorrow Since you have two equations and

*asked on August 18, 2005* -
## physics

A capacitor,consisting of two metal plates each of area 50cm2 and space 0.2mm apart in air ,is connected across a 120V supply.Calculate (1)the energy stored..(2)the electric flux density and the potential gradient..

*asked on February 13, 2016* -
## math

Give an example of a logarithmic equation that cannot be solved and explain why it cannot be solved. (3 marks)

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

D is between C and E. CE=6x, CD=4x+8, DE=27. Find CE

*asked on November 5, 2010* -
## trig

Two ships, one sailing at 30 km/hr and the other at 45 km/hr, left port at the same time. Three hours later they were 120 km apart. If you had to find the angle between their courses an equation that could be used to solve this problem is:

*asked on February 24, 2008* -
## Spanish-7thgrade

I had to write a paragraph about what my mom did yesterday and I had to use SOME REFLEXIVE VERBS- I'm not sure if this is correct. Mi madre se despertó a las seis de la mañana. Ella se despertó cuando escuchó e l despertador. Ella se levantó. Después

*asked on January 10, 2012* -
## physics

To enter the main pool at an amusement part, a swimmer uses a water slide which has a vertical height of 2.65 m. Find her speed at the bottom of the slide if she starts with an initial speed of 0.950 m/s.

*asked on November 10, 2011* -
## Pre-Calc

Please check my answers;This are polar coordinates we're studying-I'm almost positive the first two are correct. 1.Which of the folowing is another representation of (-3,pi)? (3,120degree) (3,0 degree)I think it is this one?? ((-3,0 degree) 2.Which is not

*asked on September 27, 2011* -
## Algebra

How to write an equation for this problem: A boat rental company charges a $5 usage fee and $10 an hour to rent a canoe. How long did you rent the canoe if you were charged $45?

*asked on September 10, 2011* -
## 11th grade

4root(3X>7)(y>9)(z>3)

*asked on April 23, 2010* -
## Math

a pool 5 feet deep with a diameter of 40 feet is filled with water in 50 minutes. how long will it take to fill a pool that is 6 feet deep with a diameter of 36 feet?

*asked on January 8, 2015* -
## Physics

A 2050 kg truck is traveling east through an intersection at 2.3 m/s when it is hit simultaneously from the side and the rear. (Some people have all the luck!) One car is a 1200 kg compact traveling north at 4.5 m/s. The other is a 1600 kg midsize

*asked on March 8, 2014* -
## Physics

Electrical conductivity in liquid solutions depends on the presence of free 1) neutrons 2) protons 3) molecules 4) ions explain please I really don't understand this question

*asked on March 7, 2012* -
## 5th Grade Math

Use the terms factor, divisor,multiple, product and divisible by to write as many statements as you can about the number sentence below. 7*9=63

*asked on October 24, 2011*