# Marco

Most popular questions and responses by Marco-
## Math riddle

What is one problem That Rocket Scientist, Dr. Awkward, never has?

*asked on May 3, 2009* -
## science

A biologist studying a desert ecosystem observes that the population of a lizard species increases following a particularly hot, dry period that causes a snake population to decline. What could the biologist hypothesize about the roles of these two

*asked on December 14, 2013* -
## physics

a 0.75 kg mass attached to avertical spring streches the spring 0.30m. what is the spring constant? the mass-spring system is now placed on the horizontal surface and set vibrating. what is the period of the vibration?

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

Which of the following substances has the greatest solubility in water? A. Ca(OH)2, Ksp = 6.5 × 10-6 B. Ag2SO4, Ksp = 1.5 × 10-5 C. PbI2, Ksp = 7.9 × 10-9 D. Zn(IO3)2, Ksp = 3.9 × 10-6 E. BaF2, Ksp = 1.5 × 10-6

*asked on May 2, 2010* -
## Grammar

Can someone correct my answers, please? I really need help! (Underlined words have parenthesis over them, and anything with asterisks by them means that's what I believe the answers are.) 6. Choose the function of the underlined word in the sentence. Call

*asked on September 10, 2015* -
## science

A nonnative species of animal is introduced into a healthy ecosystem. In its new environment, this species has no predators, although it preys on several native animals in the ecosystem. Make a prediction about the biodiversity and health of this ecosystem

*asked on December 14, 2013* -
## Spanish

What does this mean? "¡Viva el espanol!" I looked up on an online translator and is said "Spanish lives". Is that correct though? Is that what it would really mean in spanish? Thanks for your help! it means long live spanish THanks! Be careful with using

*asked on December 18, 2006* -
## physics

A spider hangs from a strand of silk whose radius is 4.40 10-6 m. The density of the silk is 1300 kg/m3. When the spider moves, waves travel along the strand of silk at a speed of 264 m/s. Determine the mass of the spider.

*asked on December 3, 2011* -
## biology

With each cell division , the chromosomes are divided between 2 daughter cells, yet the number of chromosomes in each cell does not change. What process ensures that the normal number of chromosomes is restored after each cell division? During which part

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

A solution is made by mixing exactly 500 mL of 0.124 M NaOH with exactly 500 mL of 0.100 M CH3COOH. Calculate the equilibrium concentration of the species below. Ka of CH3COOH is 1.8 × 10−5 [H+] × 10 Enter your answer in scientific notation. [OH−]

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

At the local swimming hole, a favorite trick is to run horizontally off a cliff that is 7.4 m above the water. One diver runs off the edge of the cliff, tucks into a "ball," and rotates on the way down with an average angular speed of 1.6 rev/s. Ignore air

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

I am reading "rise of the image culture: Re-Imagining the American Dream" by Elizabeth Thoman. The link to the article can be found by googling "rise of the image culture" Any help would be greatly appreciated.

*asked on August 26, 2009* -
## Math 10

A water sprinkler sprays in a circular a distance of 10 ft. What is the circumference of the spray? I got 31.4 ft. Is that right??

*asked on February 19, 2013* -
## English Essay

Doing a summary response essay, looking for comments, suggestions, corrections thanks!!!!!! I see them. We all see them. They are powerful, hypnotic and persuasive. Images. We cannot pry our eyes from them. We can shut the books and magazines if we do not

*asked on September 17, 2009* -
## physics

What is the radius of a communications satellite’s orbital path that is in a uniform circular orbit around Earth and has a period of exactly 24.0 hours (86,400 seconds). (Measurement is from the center of Earth.) G = 6.67 × 10-11 N.m2/kg2 ME = 5.98 ×

*asked on May 30, 2012* -
## physics

The drive propeller of a ship starts from rest and accelerates at 3.00 10-3 rad/s2 for 2.05 103 s. For the next 1.75 103 s the propeller rotates at a constant angular speed. Then it decelerates at 2.30 10-3 rad/s2 until it slows (without reversing

*asked on November 10, 2011* -
## Number sequence

Find the next 3 numbers of this sequence 243, 81, 27.

*asked on May 17, 2012* -
## Chemistry

A volume of 57 mL of 0.040 M NaF is mixed with 19 mL of 0.10 M Sr(NO3)2. Calculate the concentrations of the following ions in the final solution.(Ksp for SrF2 2.0 × 10−10) [NO3−] M [Na+] M [Sr2+] M [F−] M

*asked on July 18, 2019* -
## Math quest 2

If a triangular sail has a vertical height of 83 ft. And horizontal length of 40 ft, what is the area of the sail? I got area : 3,320ft squared

*asked on February 19, 2013* -
## physics

A wave traveling along the x axis is described mathematically by the equation y = 0.15 sin (7.5πt - 0.49πx), where y is the displacement (in meters), t is in seconds, and x is in meters. What is the speed of the wave?

*asked on December 3, 2011* -
## Biology, Cell Division

With each cell division , the chromosomes are divided between 2 daughter cells, yet the number of chromosomes in each cell does not change. What process ensures that the normal number of chromosomes is restored after each cell division? During which part

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

which of the following would help decrease the human ecological footprint? A.using bottled water instead of tap water B.using public transportation instead of riding in a car C.buying books instead of borrowing from the library D.using hot water instead of

*asked on December 9, 2013* -
## physics

Dolphins emit clicks of sound for communication and echolocation. A marine biologist is monitoring a dolphin swimming in seawater where the speed of sound is 1522 m/s. When the dolphin is swimming directly away at 7.9 m/s, the marine biologist measures the

*asked on December 3, 2011* -
## Math

Solve 3cosx+1=2secx

*asked on April 5, 2013* -
## math

uestion: Five cards are dealt from standard deck of 52 cards, what is the probability of being dealt 3 kings? Here is what I have P(3 kings)= C(4,3) = 3 out of 4 kings being dealt C(48,2 = 2 out of remaning cards to complete 5 card deal C(52,5) = 5 cards

*asked on March 5, 2011* -
## MATH

A quality control inspector found flaws in 13 out of 150 sweaters. Find the probabillity that a sweater has a flaw. Round to nearest tenth of a % Suppose the company produces 600 sweaters/day. How many WILL have flaws? PS! I have sent them in separatly. 3

*asked on May 14, 2008* -
## Ms. Sue please help

Line AB contains points A (-8, -4) and B (1, -5). The slope of line AB is A. -7 B. -1/7 C. 1/7 D. 7

*asked on March 26, 2014* -
## physics problem

A cannon is fired horizontally from atop a 40.0 m tower. The cannonball travels 175 m horizontally before it strikes the ground. With what velocity did the ball leave the muzzle?

*asked on December 20, 2010* -
## GRE Question

the average of 937, 762 and 941 is what percent of their sum?

*asked on January 5, 2017* -
## Math

Pat and Kelly went hiking in the mountains. They started at 9,100 ft. They climbed 1,200 ft the first day, descended 900 ft the second day, and climbed 1,000 ft the third day. On the fourth day they descended 800 ft. What was the average altitude at which

*asked on October 3, 2014* -
## Physical Science

How many calories of heat are required to raise the temperature of 550g of water from 12.0 degrees celcius to 18.0 degrees celcuis

*asked on November 13, 2009* -
## Math

How is constructing a perpendicular bisector similar to constructing an angle bisector's? How is it different? Help I’m sick with this

*asked on August 27, 2018* -
## College physics-oscillations

A ball is attached by two spring as shown [vvvOvvv]. If the mass is displaced a distance â–³x BELOW the equilibrium position h (see figure A). Determine whether vertical SHM is possible for the system shown.If so, find the natural frequency. [Assume

*asked on December 4, 2010* -
## Math-Factoring 2

Factor Completely 2x^3-40x^2-192x I have a common factor of x so I rewrote the problem as x(x^2-40x+192) then trying to use FOIL rewrote as (x ) (x ) And that is where i'm stuck.

*asked on April 16, 2010* -
## English, punctuation

Could you help me fine 2 more punctuation mistakes in this article? Presidential first ladies have been an active force in American politics for nearly 300 years. These women's roles have been many, and varied. In 1800, Abigail Adams, dubbed "Mrs.

*asked on February 8, 2007* -
## Math 9

2 planes leave the airport at the same time. Minutes later plane A is 70 miles due north of the airport. Plane B is 168 miles due East of the airport. How far apart are the 2 airplanes. ? I think 98 miles apart. Is that right?

*asked on February 19, 2013* -
## probabilities

Question: Five cards are dealt from standard deck of 52 cards, what is the probability of being dealt 3 kings? Here is what I have P(3 kings)= C(4,3) = 3 out of 4 kings being dealt C(48,2 = 2 out of remaning cards to complete 5 card deal C(52,5) = 5 cards

*asked on March 4, 2011* -
## PHYSICS

A cannon is fired horizontally from atop a 40.0 m tower. The cannonball travels 175 m horizontally before it strikes the ground. With what velocity did the ball leave the muzzle?

*asked on December 20, 2010* -
## Algebra

Your math test scores are 68 78 90 and 91 what is the lowest score you can iron on the next test and still achieve an average of at least 85

*asked on September 8, 2015* -
## Math 4

Karen is buying wallpaper border for her bedroom Which is 12ft by 13ft. If the border is sold in rolls of 5yards each how many rolls will she need to purchase? 156ft. Divide by 3 is total 52 yrds. So divide by 5 yd 10 for 50 yard.karen would need at 11

*asked on February 19, 2013* -
## physics

A pelican flying along a horizontal path drops a fish from a height of 4.7 m. The fish travels 7.7 m horizontally before it hits the water below. What was the pelican’s initial speed? The acceleration of gravity is 9.81 m/s2 . Answer in units of m/s

*asked on November 2, 2012* -
## physics

A member of an aircraft maintenance crew wears protective earplugs that reduce the sound intensity by a factor of 355. When a jet aircraft is taking off, the sound intensity level experienced by the crew member is 72 dB. What sound intensity level would

*asked on December 3, 2011* -
## Geometry

A right triangle has an angle that measures 55 degress. The leg adjacent to this angle has a length of 43 cm. What is the length of the triangle? Round to the nearest tenth

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

3. Find the slope of each line with equation as given. a) Y=4 b) X=2 Answers: a) zero b) undefined 4. Graph the following equations: a) 3x-2y=6 answer: (2,0) and (0,-3) b) 5x+3y=6 (need help with this one) Are they correct and would need help with b.

*asked on March 6, 2010* -
## Math...again

A quality control inspector found flaws in 13 out of 150 sweaters. Find the probabillity that a sweater has a flaw. Round to nearest tenth of a % But what if the company produces 500 sweaters, how many will NOT have flaws

*asked on May 14, 2008* -
## Math word problem

A fire and rescue squads places a 15 ft ladder against a burning building. If he ladder is 9ft from the building how far up will the ladder reach? I got 17.5 ft Is that right?

*asked on February 19, 2013* -
## geometry

T is the set of all positive numbers n such that n

*asked on January 31, 2007* -
## Biology

Plants have cells that contain chloroplasts. Why must their cells contain mitochondria as well? Chloroplasts are the sites of photosynthesis. Mitochrodria is the site of energy synthesis.

*asked on November 18, 2006* -
## Geometry

The hypotenuse if a right triangle measures 9 inches and one of the acute angles measures 36 degress. What is the area if the triangle? Round to the nearest square inch.

*asked on February 14, 2011* -
## College physics-oscillations

A ball is attached by two spring as shown [vvvOvvv]. If the mass is displaced a distance â–³x BELOW the equilibrium position h (see figure A). Determine whether vertical SHM is possible for the system shown.If so, find the natural frequency. [Assume

*asked on December 4, 2010* -
## physical science

what does Q=m times t times c. mean and wat are the meaning of each letter

*asked on November 30, 2010* -
## Biology

Imagine that you have a stock solution with a concentration of 4.6 M glucose (C1). You want to use the stock solution to prepare a diluted solution of 0.22M glucose (C2). You need a total volume of 10mL of 0.22M glucose (V2). What volume of water you need

*asked on September 20, 2015* -
## Math

The function rule n=0.69p relates the population "p" and the number of "n" these people who used the internet. The number of people who used the internet was 202 million. What was the population? I am so confused, please help me with atleast the first

*asked on November 19, 2014* -
## Math - Discounts

A tv is advertised as 20% discount. If the original price is 450.00 what is the new price? Help please

*asked on January 9, 2013* -
## physics

A pelican flying along a horizontal path drops a fish from a height of 4.7 m. The fish travels 7.7 m horizontally before it hits the water below. What was the pelican’s initial speed? The acceleration of gravity is 9.81 m/s2 . Answer in units of m/s

*asked on November 2, 2012* -
## Soc studies declaration of independence

Can you help what rights cannot be denied? Would it be pursuit of life,libert, pursuit of happiness?

*asked on August 29, 2012* -
## MATH

FIND EACH ESTIMATE: 1) A RARE TRUFFLE ONCE SOLD FO $13.20 FOR A 0.44 OZ CAN. APPROXIMATELY HOW MUCH WOULD 1LB OF THIS TRUFFLE COST? 2) THE LENGTH OF THE LONGEST LOAF OF BREAD MEASURED 1,405 FT 1 3/4 IN. IT WAS CUT INTO SLICES 1/2 IN. THICK. HOW MANY SLICES

*asked on September 5, 2011* -
## 3 states of matter

hi can you please help me by giving some facts on the 3 states of matter solid liquid gas

*asked on January 28, 2011* -
## Math

A quality control inspector found flaws in 13 out of 150 sweaters. Find the probabillity that a sweater has a flaw. Round to nearest tenth of a %

*asked on May 14, 2008* -
## Biology

Use an example to describe the relationship among cells, tissues, organs, and organ systems. Do you mean analogy rather than example? If so: Picture a living organism as a city. The houses are cells, city blocks are tissues, residential areas could be

*asked on December 2, 2006* -
## Math

Rachel gave 1/4 of a pie to each of 5 friends how many pies did she give to her friends in all

*asked on December 17, 2015* -
## Calculus

You are creating a rectangular garden and want to surround it with brick edging. You also are going to divide it into two halves with the edging so that your vegetables and herbs are on one side and flowers are on the other. You only have 120 ft worth of

*asked on September 11, 2013* -
## English

Is this a good thesis about the film guess who is coming to dinner? The 1967 film, Guess Who’s Coming To Dinner at initial viewing shows that racial relations have come a long way, however, close scrutiny of the film reveals that racial prejudices are

*asked on August 6, 2013* -
## Math

Find product and write answer in scientific notation (3 x 10^6). * (2 * 10^12) I got .6 x 10 ^19 Is this right?

*asked on February 26, 2013* -
## Math

Find the product write answer in scientific notation (3 x 10^6) * (2 x 10^12) I got. .6 x 10^ 9

*asked on February 26, 2013* -
## Social studies

Learning about the declaration of independence The. First two paragraphs. Question 1. What did the colonist feel was. Necessary? I wrote: the colonist felt they must breah their political ties with Britain

*asked on August 29, 2012* -
## Algebra

1. Write the equation of the line with the given slope and y-intercept a) m=3/8 and b=6 Answer: y=3/8x +6 b) m=-2 and b=11 Answer: y=-2x+11 c) m=0 and b=6 Answer: y=x+6 Correct?

*asked on March 6, 2010* -
## Algebra help

m having an extremely tough time with integers in algebra when simplifying algebraic expressions. No matter which method I use I still end up confused and end up with a completely different answer. Ex: 5t-{7t-[4r-3(t-7)]+6r}-4r

*asked on February 3, 2010* -
## Egnlish

Writing an argument essay. If anyone can read and comment that would be great!. Helicopter Parents: Harmful To Our Youth Picture the following: A young woman twenty-two years of age walks into her apartment, she turns on the light switch and the light in

*asked on December 9, 2009* -
## English

Need some feedback if this works as a summary. Thank you. In “Power of Images: Creating the Myths of Our Time,” J. Francis Davis believes communication by images with its voluminous exposure and alluring advertisements, has overpowered what can be

*asked on September 3, 2009* -
## biology

Why is CO^2 required by plants to produce glucose? ( the arrow pointing up should be pointed down.) CO2 is where the Carbon comes from to make sugar.Glucose is a six-carbon sugar represented by the formula C6H12O6

*asked on January 4, 2007* -
## History

What did Renaissance wrters write about? poems and their loved ones thanks! Marco, got to Wikipedia and type in renaissance. You should find plenty of info to help you.

*asked on September 9, 2006* -
## Math

Natalie had some marbles. She gave 1/3 of them to her brother, who kept 12 marbles for himself and gave the rest to 5 friends. If each friend received 7 marbles, how many marbles did Natalie have at first? solve

*asked on January 7, 2017* -
## algebra word problem

One year, Shannon made $288 from two investments. $1100 was invested at one yearly rate and 1800 at a rate that was 1.5% higher. Find the two rates of interest

*asked on December 11, 2016* -
## Chemistry

Imagine that you have a stock solution with a concentration of 4.6 M glucose (C1). You want to use the stock solution to prepare a diluted solution of 0.22M glucose (C2). You need a total volume of 10mL of 0.22M glucose (V2). What volume of water you need

*asked on September 20, 2015* -
## Science --

If you mixed 25.00g of salt in 100.00mL of water and it all dissolved, what would the concentration be in g/mL?

*asked on April 8, 2013* -
## Math 5

A rectangular yard is twice as long as wide the perimeter is 120ft. What are the yards dimensions? W : L : I got. W : 10. And ll: 50 Is that right ?

*asked on February 19, 2013* -
## ALGebra

Can you check 2x + 3 (x-2) -3 (x-6) I got 2x+3x-6 -3x+18 2x+3x-3x= 2x -6+18 =12 Final answer : 2x+ 12

*asked on October 14, 2012* -
## Soc studies

What are the differences between the 1st and 2nd continental congress and their outcome?

*asked on September 11, 2012* -
## Declaration of independence

In first 2 paragraphs. Of declaration. Why are governments set up? Governments are set up to secure the rights of people. Is this correct

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

Stuck on solving this inequality, help please. 3X le 15 and 2x gt -6

*asked on February 10, 2011* -
## Math - Factoring

Factor Completely 6^8+12x^6-24x^4+30x^2 I got 6x^2(x^6+2x^4-4^2+5) Correct?

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

I am not totally understanding this process. Factor Completely: x^5y^2 - x^4y^2 - 2x^3y^2

*asked on April 15, 2010* -
## Algrebra

Write the equation of the line passing through the given point with the given slope. a) point (3,-2) with slope of m=5/3 Answer: y-(-2)=5/3x-3 b) point (3,9) with slope m=(-2/7) Answer: y-9=-2/7x-3 Correct?

*asked on March 7, 2010* -
## algebra

I am having an extremely tough time with integers in algebra when simplifying algebraic expressions. No matter which method I use I still end up confused and end up with a completely different answer. Ex: 5t-{7t-[4r-3(t-7)]+6r}-4r

*asked on February 3, 2010* -
## english

Can you help me write a paper describing a person to an m & m?

*asked on October 23, 2008* -
## Biology ?

Use an example to describe the relationship among cells, tissues, organs, and organ systems Do you mean analogy rather than example? If so: Picture a living organism as a city. The houses are cells, city blocks are tissues, residential areas could be

*asked on December 2, 2006* -
## Science

What kind of Information can a Compound microscope provide? Much more information than I can type for the next three months. Blood cells, animal parts, leaf structures, snow flakes, and you get the idea. I was sick about two weeks when I was a child and we

*asked on September 9, 2006* -
## algebra word problem

One year, Shannon made $288 from two investments. $1100 was invested at one yearly rate and 1800 at a rate that was higher. Find the two rates of interest.

*asked on December 10, 2016* -
## quimica

In assessing 20.0ml of NaOH 0.175M , calculate how many ml of 0.200M HCl must be added to obtain a pH of 12.55

*asked on June 4, 2016* -
## Math 8

A rectangular field is to be fenced completely. The width is 28yd. And the total area is is 1960ydsquared. What is the length of the field ? I got: 70 yd Is that right?

*asked on February 19, 2013* -
## math

During the dinner rush, a certain restaurant cooks about 25 pounds of spaghetti per hour. How many grams of spaghetti do they cook per second?

*asked on January 14, 2013* -
## Math

A 20 meter ladder is leaning against a house.The bottom of the ladder is 15 meters away from the house. How far, to the nearest tenth, is the top of ladder from the ground? Do I multiply 20,x 15? I don't know how to do the problem

*asked on December 17, 2012* -
## Math word problem

Ryan collected 43 candy bars on Halloween he gave 15 of them to his father andhe gave his mother ten less candy bars than he gave his father. Then Ryan ate 4 of the candy bars . Hwo many Andy bars does he have left ? I got 19

*asked on November 4, 2012* -
## Word problem math

Word problem. You cut a 2 m long board into 2 pieces . One piece is 10 cm shorter than the other. How long are each boards.? I got. 1 pc at 80!cm. the other 1pc at 100 cm Is this right ?

*asked on October 14, 2012* -
## Algebra inequality

I have to choose a variable and write inequality For less than or equal to I'm using these keys

*asked on October 14, 2012* -
## algebra

X-5/3 =1 Or X - 5 = 1 ______ 3 I'm trying to type and tell you it's x-5 over 3 equals 1 I don't know how to do I think I have to do reverse operation which is multiply

*asked on October 14, 2012* -
## Pls check math

3+2(4)-3+4(-3)= I got -4 3+4-2-5+3-6-8= I got I can't figure out I got -17 4-3(2+6) = I got. -20 10/5 + 8+(-3) /5 -4= I got -1

*asked on September 17, 2012* -
## Math

I need to identify property. For r (l) = r Would this be inverse property for multiplication?

*asked on September 11, 2012* -
## Math. Fractions

Emily exercised from 4:05pm tob4:32 pm For what part of an hour did Emily exercise ? Write the fraction in simplest form Would it be 27/60 = 9/20

*asked on May 17, 2012*

## Pages

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