# Cam

Popular questions and responses by Cam-
## physics

if a plane is flying at a speed so that the apex half-angle of its shock wave is 30 degrees, what is the speed if the speed of sound is 320 m/s?

*asked on May 13, 2011* -
## statistics

2. Why is it important to know the mean and standard deviation for a data set when applying the empirical rule? 3. If we are focused on 68% of the normal distribution, what percentage of the distribution is left in the upper tail only? 4. What value

*asked on April 23, 2013* -
## Math

An investment is worth $3518 in 1995. By 2000 it has grown to $5553. Let y be the value of the investment in the year x, where x = 0 represents 1995. Write a linear equation that models the value of the investment in the year x. A. y = -407x + 7588 B. y

*asked on April 4, 2017* -
## History

Which event led to King John I signing the Magna Carta? The pope and the king disagreed about how the country should be ruled. The king wanted to invade France and be crowned as its rightful ruler. The English nobles rebelled. The imprisonment of Robert

*asked on April 27, 2020* -
## Chemistry

Balance the following redox (oxidation-reduction) reaction under basic conditions. (Include states-of-matter under the given conditions in your answer. Use the lowest possible whole number coefficients.) CrO42−(aq) + S2O32−(aq) → Cr3+(aq) +

*asked on April 14, 2014* -
## Chemistry

Calculate the pH of the 0.20 M NH3/0.25 M NH4Cl buffer. I calculated the pH to be 9.15 What is the pH of the buffer after the addition of 10.0 mL of 0.10 M HCl to 72.5 mL of the buffer?

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

Two forces are pushing on an object, one at 12 lbs of Force and one at 5.66 lbs of Force. The angle between them is 35° (each is 72.5 from horizontal, such that the forces make a v with the object in the center). 17. What is the total Force on the object?

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

16. Vector A has a magnitude of 3 in the leftward direction and B has a magnitude of 5 in the rightward direction. What is the value of 2A – B? You can also answer other types of problems using vectors. Try this one: Two forces are pushing on an object,

*asked on December 6, 2011* -
## Social Studies

What two ancient civilizations had the most similar religious beliefs/ A. Greek and Persian B. Roman and Greek C. Chinese and Roman D. Persian and Chinese I pick B is this correct

*asked on March 20, 2015* -
## Calculus

Find relative maxima and minima of g(x)= 2x^2+ 4000/x +10

*asked on March 6, 2013* -
## geometry

In problems 1 and 2, the initial point and the terminal point of a vector are given. Write the vector in component form. 1. Initial point: (0, 0); Terminal point: (3, -4) A Lesson 13 B Lesson 13 C Lesson 13 D Lesson 13 E Lesson 13 F Lesson 13 2. Initial

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

16. Vector A has a magnitude of 3 in the leftward direction and B has a magnitude of 5 in the rightward direction. What is the value of 2A – B? You can also answer other types of problems using vectors. Try this one: Two forces are pushing on an object,

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

Jenny wanted to solve the quadratic equation x2 - 11x +18 = 0 by factoring. Which of the following equations would lead her to solve the given equation?

*asked on August 30, 2014* -
## Physics

A single mass (m1 = 3.2 kg) hangs from a spring in a motionless elevator. The spring constant is k = 253 N/m. 1) What is the distance the spring is stretched from its unstretched length? This first answer is equal to 12.4 cm but I am having trouble on the

*asked on February 21, 2014* -
## Physics

A blue ball is thrown upward with an initial speed of 19.6 m/s, from a height of 0.5 meters above the ground. 2.4 seconds after the blue ball is thrown, a red ball is thrown down with an initial speed of 7.9 m/s from a height of 22.1 meters above the

*asked on February 2, 2014* -
## geometry

For problems 7 and 8, find the magnitude and direction angle of the given vector. 7. A magnitude: 5; direction angle: 53.13° B magnitude: √ 5; direction angle: 53.13° C magnitude: √5; direction angle: 3.40° D magnitude: √5; direction angle: 0.80°

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

Two forces are pushing on an object, one at 12 lbs of Force and one at 5.66 lbs of Force. The angle between them is 35° (each is 72.5 from horizontal, such that the forces make a v with the object in the center). 17. What is the total Force on the object?

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

A plane is heading west at 200 mph. The wind is blowing S30°W at 25 mph. 1. What is the ground speed of the plane? 2. When you solve the triangle, what is the smallest angle? 3. What is the largest angle of the triangle? 4. What is the remaining angle? 5.

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

A sample of a hydrate of CuSO4 with a mass of 250 grams was heated until all the water was removed. The sample was then weighed and found to have a mass of 160 grams. What is the formula for the hydrate? CuSO4 * 10 H2O CuSO4 * 7 H2O CuSO4 * 5 H2O CuSO4 * 2

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

A bookcase has 43 books. there are 34 students in the class. Are there enough books for the students? how do you know? use place value to solve

*asked on August 17, 2009* -
## English

I am reading "The crisis, No.1" now. What does this sentences mean "Mutual fear is the principal link in the chain of mutual hate, and woe be to that state that breaks the compact"? I really need help. Please tell me someone. "Mutual fear is the principal

*asked on October 17, 2006* -
## Chemistry

The theoretical yield of water in the following reaction is calculated to be 149.4 g. If 123.1 g of water were collected after the reaction has gone to completion what is the percent yield of the reaction? Show your work.

*asked on January 16, 2019* -
## German

8. Der Mann... A)bist alt B)Sind alt*** C)sieht alt aus D)saht alt aus 9)Die Frau... A)hat blondhaarig B)bist blondhaarig*** C)sind blondhaarig D)ist blondhaarig 10)Die Sonne... A)hat gelp B)Ist gelb*** C)Bist geld D)sind gelt 11)Die alten legendend...

*asked on December 19, 2018* -
## History

What are 3 main events that led to the stock market crashing in 1929?

*asked on May 6, 2018* -
## Math

The rabbit population in a forest area grows at the rate of 7% monthly. If there are 180 rabbits in September, find how many rabbits (rounded to the nearest whole number) should be expected by next September. Use . A. 402 B. 408 C. 428 D. 415 I got 402, is

*asked on April 5, 2017* -
## spanish

How do you say an uncle in spanish? A:uno tio B:unos tios !@#$%^&io** How do you say some female cousins in spanish? A:Unas primas B:Una prima C:Unos primos**

*asked on February 17, 2017* -
## social studdies

Which event within a state will most likely require the involvement of the federal government A.A corporation is created B.The state constitution is amended C.A boundary with a nearby state is disputed D. The rules for obtaining a drivers licence change

*asked on October 19, 2016* -
## Algebra 2

Mrs. Jones algebra 2 class scored very well on yesterday's quiz. With one exception, everyone received an A. Within how many standard deviations from the mean do all the quiz grades fall ? Ó =3.1 95, 92,94,88,96,99,91,93,94,97,95,97

*asked on April 1, 2016* -
## science

Some hypothetical metal has the simple cubic crystal structure. If its atomic weight is 70.4 g/mol and the atomic radius is 0.126 nm, compute its density in g/cc.

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

You are on an airplane traveling 30° south of due west at 130 m/s with respect to the air. The air is moving with a speed 30 m/s with respect to the ground due north. One question.. 2) What is the heading of the plane with respect to the ground? (Let 0°

*asked on February 15, 2014* -
## Instructional materials, their preparation and use

Which of the following would you use to sort through slides for a slide or injection?

*asked on June 17, 2013* -
## Statistics

For questions 1-5, write the null and alternative hypothesis. 1. Does the water temperature have an effect on the number of people in the pool? 2. Does the weather have an effect on the number of people at the beach? 3. A fitness center is running a

*asked on May 3, 2013* -
## statistics

A specific study found that the average number of doctor visits per year for people over 55 is 8 with a standard deviation of 2. Assume that the variable is normally distributed. 1. Identify the population mean. 2. Identify the population standard

*asked on April 15, 2013* -
## Teaching techniques

Which learning technique is frequently used in the expository model of teaching?

*asked on April 14, 2013* -
## Calculus

Find the second derivative of the function f(x)= t^2e^(-2t)

*asked on April 10, 2013* -
## Calculus

Find the absolute maximum value and the absolute minimum value, f(x)= (x +1 )/ (x-1) on [2, 4]

*asked on March 20, 2013* -
## calculus

Let f(x)=ax^3+6x^2+bx+4. Determine the constants a and b so that f has a relative minimu at x=-1 and a relative maximumat x=2.

*asked on March 6, 2013* -
## geometry

1. Initial point: (0, 0); Terminal point: (3, -4) A Lesson 13 B Lesson 13 C Lesson 13 D Lesson 13 E Lesson 13 F Lesson 13 2. Initial point: (3, 5); Terminal point: (-2, -1) A Lesson 13 B Lesson 13 C Lesson 13 D Lesson 13 E Lesson 13 F Lesson 13 In problems

*asked on December 7, 2011* -
## 5th grade

We are working on Fractions, mixed numbers and decimals. the problem says - write each decimal as a fraction or mixed number in simplest form... 0.7 or 0.08 ....ugg HELP

*asked on February 19, 2009* -
## Art

what technology was key to the efficiency of Gutenberg printing press

*asked on May 5, 2020* -
## Math

On a Shelf at a gaming store that are five PlayStations and for Nintendo switches if One gaming system is selected at random find the probability that the system is a switch

*asked on January 29, 2020* -
## Civics

Select two sentences which demonstrate that it was difficult to get states to ratify the Constitution. A. “It soon became clear that some states—especially big states such as Massachusetts, New York, and Virginia—were not ready to adopt the

*asked on November 6, 2019* -
## Adv biomechanics

a 1kg ball is thrown vertically. If the ball has a velocity of 8 m/s at release, please find: the maximal height that the ball can reach and the time it took for the ball to reach the maximal height and how long does it take for the ball to return to

*asked on June 13, 2019* -
## jiskha

can i please get unbanned

*asked on October 22, 2018* -
## jiskha

i'm sendtheword and i'm asking why i was banned

*asked on October 22, 2018* -
## English

What is a subordinating conjunction and clause?

*asked on October 16, 2018* -
## Physics

Instructions for finding a buried treasure include the following: Go 585.3 paces at 156◦ , turn to 215◦ and walk 282 paces, then travel 400 paces at 132◦ . Find the magnitude of the resultant displacement from the starting point. What is the

*asked on September 5, 2018* -
## Math

Consider the monomials 15x^2y^2 and 6x^3y. a. Factor the monomials. b. What factors of these monomials are common factors? c. Find the greatest common factor of 15x^2y^2 and 6x^3y. (UPDATED VER.)

*asked on September 3, 2018* -
## Math

Consider the monomials 15x^2, y^2, and 6x^3 a. Factor the monomials. b. What factors of these monomials are common factors? c. Find the greatest common factor of 15x^2, y^2, and 6x^3

*asked on August 30, 2018* -
## Civics

What biases are present n the movie Bowling for colombine?

*asked on May 7, 2018* -
## History

I need to make a timeline for the great depression. I need four lead up events to the stock market crash, then after that happens, i need four response events on how they responded to everything falling apart.

*asked on May 6, 2018* -
## Language Arts

What is a literal description poem? Or can someone provide an example? (would be easiest for me) but I am up to any of the tutors to post a reliable link that can help me as I can not find any in my search engine thanks.

*asked on April 25, 2018* -
## Algebra

the area of a rectangle painting is given by the trinomial a^2-14a+45. the painting length is (a+2). what is the painting width?

*asked on January 23, 2018* -
## Math

How to use a model for 5/8 divided by 2/3

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

A statement Sn about the positive integers is given. Write statements S1, S2, and S3, and show that each of these statements is true. Show your work. Sn: 2 is a factor of n^2 + 7n

*asked on May 4, 2017* -
## westdale middle

the last years of reconstruction were violence and voter intimidation. can someone please help

*asked on March 6, 2017* -
## Math

Recipe needs to make exactly 10 cups. 5 ingredients. Using 1/3 cups and/or 1/4 cups only. Please help.

*asked on December 5, 2016* -
## Physics

How do I figure out how long it takes two runners to have the same momentum if I am given a, m, and Vi for both runners? Runner A= 85kg, 2ms-2, Vi=1ms-1 Runner B= 65kg, 3ms-2, Vi=0ms-2 I don't want an answer, just which equations to use or a hint.

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

Which quadratic rule represents the data in the table? X : -1 | 0 | 1 | 2 | 3 Y: 4 | 5 | 4 | 1 | -4 Y = -2x^2 + 5 Y = -x^2 + 5 Y = -x^2 - 5 Y = x^2 + 5 My answer is Y = -x^2 - 5

*asked on May 9, 2016* -
## Math

What are the mean, median mode and range of the data we given the altitude of lakes in feet? -9,-36,-23,-8,17,-52,27,-36 Mean: -25 Median: -26 mode: -44 range: 36 Mean: -25 Median: -:-36 mode: -36 Range: 44 Mean: -26 Median: -25 Mode: -36 range: 44 Mean:

*asked on April 20, 2016* -
## Science

Why do scientists study images made with parts of the electromagnetic spectrum other than visible light? A)These images are the only way to observe galaxies beyond our own. B)These images reveal information that visible light does not show. C)These images

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

1.Find the length of the hypotenuse of a right triangle with the legs of 9cm and 12cm A.8 B.21 C.15*** D.225 2.The length of a hypotenuse of a right triangle is 13cm. The length of one leg is 5cm. Find the length of the other leg. A.14 B.144 C.8 D.12***

*asked on November 7, 2015* -
## math

How do i divide 6 by 2/7

*asked on October 20, 2015* -
## Calculus

How can I solve this using Log differentiation? I'm not sure how to even start it. y=(cos(x)(x^2+9)^(2/3)/(sqr(x^3+2))

*asked on April 13, 2015* -
## Math

If 50 books is $86.45 for each Books and 150 books is $80.95 for each book what is the cost for 60 books?

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

Jackson have a piece of wood that is 6 feet long. He is cutting it into pieces that are 1/3 of a foot. How many pieces of wood will he have after he cuts it?

*asked on January 7, 2015* -
## Differential Equations

(a) Let S be the set of solutions y(t) to the differential equation dy/dt = -y for t> 0. With addition and scalar multiplication of elements defined in the usual way, is S a vector space? (b)Let T be the set of solution y(t) to the differential equation

*asked on October 13, 2014* -
## Math DE

Find the general solution of the differential equation dy/dx-4y= -5y^2

*asked on August 3, 2014* -
## Math

Expand (1+y+ky^2)^8 until y^3

*asked on May 10, 2014* -
## physics

A projectile is launched vertically from the surface of the Moon with an initial speed of 1210 m/s. At what altitude is the projectile's speed two-fifths its initial value?

*asked on April 25, 2014* -
## math 6th grade

the bridge span is 360 meters long. the bridge is 30 meters shorter than the main span. write and solve an equation to the the length of the main span

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

the length of the blue ribbon is two-thirds of the length of the red ribbon. writh an equation to find the length r of the red ribbon

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

A red ball is thrown down with an initial speed of 1.2 m/s from a height of 25 meters above the ground. Then, 0.6 seconds after the red ball is thrown, a blue ball is thrown upward with an initial speed of 22.9 m/s, from a height of 0.8 meters above the

*asked on February 2, 2014* -
## math

cot^2(x)-1/1+cot^2(x)

*asked on November 20, 2013* -
## Trigonometry

(1/(cscx+1))-(1/(cscx-1))

*asked on November 20, 2013* -
## Trigonometry

simplify: tanx/secx+1

*asked on November 20, 2013* -
## Trig

sin^2(34)+sin^2(48)+sin^2(56)+sin^2(42)

*asked on November 19, 2013* -
## Trig

sqrt(100+(10cotx)^2)

*asked on November 19, 2013* -
## Statistics

A credit manager has chosen a sample of size 2,164 to estimate the mean balance of credit accounts to within $0.50. A pilot study of 50 accounts had a mean of $1,219 and a variance of 100. The level of confidence of the interval is: 90% 95% 98% 99%

*asked on November 16, 2013* -
## Statistics

A random sample of 50 students chosen from an elementary school with 400 students was found to have a mean allowance of $26 per week with a standard deviation of $8. Obtain a 98% confidence interval for the total amount of allowance money given to students

*asked on November 13, 2013* -
## Stats

A company with two plants producing the same product, but with two slightly different manufacturing processes, conducted a sample study at each of the two plants with the following results: The sample statistics from the first group are: n = 40, x-bar =

*asked on November 13, 2013* -
## Physics

A jetliner, travelling northward, is landing with a speed of 79 m/s. Once the jet touches down, it has 710 m of runway in which to reduce its speed to 7.4 m/s. Compute the the average accelaration (magnitude and direction) of the plane during landing.

*asked on September 20, 2013* -
## stats

Usin7) An employer polled its employers to see if they agree with the proposed new store hours and whether or not their present shift made a difference in their answers. The customers answered 1 for agree, 2 for don't know, and 3 for disagree. Nine first

*asked on June 15, 2013* -
## Statistics

1. A study of 40 people found that they could do on the average15 pull ups with a standard deviation of .6. Find the 99% confidence interval for the mean of the population. 2. A study of 50 pizza delivery workers found that they could make 6 deliveries per

*asked on May 3, 2013* -
## statistics

A study found that citizens spend on average $1950 per year on groceries with a standard deviation of $100. Assume that the variable is normally distributed. 5. Identify the population mean. 6. Identify the population standard deviation. 7. Find the

*asked on April 19, 2013* -
## Calculus

Write the expression as the logarithm of a single quantity. ln 2 + 1/2 ln(x +1)-2 ln(1+ x^(1/2))

*asked on April 10, 2013* -
## Calculus

Determine the function is concave upward and where it is concave downward f(x)= x / (x+1)

*asked on March 20, 2013* -
## Calculus

Find the absolute maximum value and the absolute minimum value, g(x)=1/8 x^2 - 4 x^(1/2) on [0, 9]

*asked on March 20, 2013* -
## College Math

I need help solving these problems by using the substitution problem 2x-3y=16 5x+2y=21

*asked on March 20, 2013* -
## 6th math

a factory can produce 45 containers of yogurt in t minutes, 950 grams of fruit are used for every 25 containers of yogurt b) find in terms of t the time taken by the factory to produce 100 containers of yogurt c) if t=6 find the amount of fruit used in

*asked on March 5, 2013* -
## physical science

You are at a concert and you are located 91.2-m from the speakers. The frequency belting from the speakers are 291-Hz, if it takes 0.230-sec for the sound to reach your location what is the sounds wavelength?

*asked on February 28, 2013* -
## physical science

You are at a concert and you are located 95.9-m from the speakers. The frequency belting from the speakers are 257-Hz, if it takes 0.503-sec for the sound to reach your location what is the sounds wavelength?

*asked on February 28, 2013* -
## physical science

You are at a concert and you are located 97.5-m from the speakers. The frequency belting from the speakers are 216-Hz, if it takes 0.181-sec for the sound to reach your location what is the speed of sound in this facility?

*asked on February 28, 2013* -
## Math

If Bob hikes 5/8 of a mile in 1/3 of an hour. How fast is going in miles per hour?

*asked on January 23, 2013* -
## Biology

what two mutations cause a shift or after the sequence after the mutation?

*asked on December 18, 2012* -
## Biology

do mutations occur in DNA or RNA? Explain

*asked on December 18, 2012* -
## Biology

what is the difference between a gene mutation and a chromosomal mutation?

*asked on December 18, 2012* -
## physics

)A block with mass m = 11.3 kg slides down an inclined plane of slope angle 43.4 ° with a constant velocity. It is then projected up the same plane with an initial speed 1.45 m/s. How far up the incline will the block move before coming to rest?

*asked on December 9, 2012* -
## physics

)A block with mass m = 11.3 kg slides down an inclined plane of slope angle 43.4 ° with a constant velocity. It is then projected up the same plane with an initial speed 1.45 m/s. How far up the incline will the block move before coming to rest?

*asked on December 9, 2012* -
## English

On an invitation, it says "Come celebrate at my pad!" and has a picture of a lilly pad on it. Is this an example of a pun?

*asked on September 20, 2012*

## Pages

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