# Posts by john

Total # Posts: 8,394

**Algebra**

If x + (1/x) = a Find these in terms of a: x^2 + (1/x^2) and x^3 + (1/x^3) I got a^2 and a^3 as my answers, but the book says a^2 - 2 and a^3 - 3a. How did they get that?

**Algebra**

What I don't understand about this problem is that what the letters mean? I am sorry I forgot the + d at the end.

**Algebra**

Find a trigonometric equation in the form y = a sin (b (x-c)) which has a minimum of (3, -5) and a zero value of (6, -1). There is a graph with the minimum and the zero value labeled. It is wavy with suggests that it is a sin curve.

**Algebra**

Solve 3^2x+1 = 5(3^x) + 2 I would know how to solve it if it was only 3^2x+1, but now it seems more complicated.

**hookle's law**

50 N/25 cm = 100 N/?? cm 50 cm stretch + 20 cm = 70 cm

**math-probability**

To win first prize, he has a 1/500 chance to win first and 3rd. Assume he wins the first prize which is 1/500 then chance of winning 2nd is 1/499 and chance of winning 3rd is 1/498 to get to your ANDS multiply the two probabilities.

**Maths**

b.Find the seventeenth term of an Arithmetic Progression, whose 9th and 15th term are 19 and 37 respectively.

**statistics**

At one college, GPAs are normally distributed with a mean of 2.6 and a standard deviation of 0.6. What percentage of students at the college have a GPA between 2 and 3.2?

**Math - error NOT 2**

It said NOT 2; therefore, the product of 1/2 times 5/6 would be your answer

**Science**

Consider a lead-acid battery with 500 Ah capacity and a rated voltage of 12 V. a)What is the total capacity of energy in watt-hours that can be stored in the battery? b)Assume that the battery is completely empty. The battery is now charging at a C-rate of 0.20C. What is the ...

**politics**

I agree!!

**chemistry**

honey is more dense than ink.

**chemistry**

If temperature increases, rate of evaporation increases. If it is more humid, the rate of evaporation decreases.

**Social Studies**

I bet if you do a google search of the McCarran Act, you will find the answer very quickly.

**science**

Carbon, hydrogen, oxygen, nitrogen, sulphur, phosphorus, boron, chlorine, flourine, iodine etc. are the non-metals Sodium, potassium, magnesium, calcium, cobalt, manganese, iron, zinc, tin, molybdenum, vanadium etc. are the metals.

**Math**

Answer = 6 1176 = 2*2*7*7*(3*2) 1176 = 4 × 49 * (6) In above eqn, 4 and 49, both are perfect squares, but 6 isn't. So if we multiply 1176 by 6 (i.e. 1176 * 6 = 7056) we get 7056, which is a square of 84.

**science**

For every action there is an opposite and equal reaction. By adding Na2CO3 that will give you the CO3 which will push the reaction to form more CaCO3

**Math**

Multiply the two binomials. x^2 + 2x + 4x + 8 simplify from here and that will be your answer. area = l x w

**Math**

r = 4g r + g = 75 4g + g = 75 5g = 75 g=15 4g = 60 red.

**Civics**

I agree

**algebra**

-b +-sq root of b^2-4ac all of this divided by 2a 2 +- sq root (-2)^2 -4(1)(8) all divided by 2(1) 2 +- sq root 4-32 2+- sq root -28 all divided by 2 2+- 2i sq root of 7 comes from 4(-1)(7) all divided by 2 reduces to 1 +i sq rt 7, 1-i sq rt 7 are the roots. or are the values ...

**Algebra**

m = change in y/change in x m = (12-15)/(7-4) = -3/3= -1 Perpendicular lines have slopes that multiply to -1. If slope = 1/2 perpendicular = -2 In this case -1 perpendicular is 1.

**History**

I think it is D.

**Maths**

24/26 = 12/13

**Science**

The green revolution depended on A) new biodegradable pesticides. B) high-yielding grain varieties. C) clearing forest for crop land. D) organic fertilizers.***

**math science geography**

A resultant force of 15.00n acts on a body for 4s mass 4kg. calculate the change in momentum of the body within this period

**Math 6b**

The nu1/3mbers are 1 2 3 4 5 6 even numbers are 2 4 6 then it says not 2 4 6 is left which is 2/6 =

**Science**

How do global positioning systems use elevation points on Earths system to find latitude and longitude A. By using signals from a network of satellite B. By using topographic maps C. By using satellite images D. By using photography

**Science**

Do global positioning systems use elevation on Earths system to find latitude and longitude A. By using signals from a network of satellite B. By using topographic maps C. By using satellite images D. By using photography

**Physics**

speed = wavelength/frequency 340m/sec = 3m/ frequency can you finish from here? 3 times 340 with units of seconds.

**MATH**

2 happened 4 times 4 happened 9 times 6 happened 2 times 15/24 or 5/8 The theoretical probability would be 3/6 or 1/2 since half the numbers are even.

**stats help **

A scratch-card costs 5¤ and has two possible prizes. There is a 10% chance you get 5¤ back and a 1% chance you get 100¤. In all other cases, you get nothing. Let X denote your net winnings, i.e, (X = prize - cost). What are the expectation and standard ...

**statistics**

find n if c(n,3)=120

**Geography**

In which category should Atomic energy be placed, conventional source of energy or non conventional source of energy ? Please explain your answer ! Thanks

**Chemistry**

I need help balancing this acidic equation out with reduc/oxidation. Mn+2 (aq) + NaBiO3(s) -----> Bi+3(aq) + MnO4-1(aq)

**science**

I agree with B.

**Algebra 2 check **

The graph of y =1/x is vertically stretched by a factor of 3, re?ected across the y-axis and shifted to the left by 2 units. What is the function of the resulting graph? y=3/x-2 y=-3/x+2 y=1/3x-6 y=-1/3x+6 my answer is B

**Algebra 2 struggle**

How is the the graph of y=1/2x-6 obtained from the graph of y=1/x ? A) Vertically stretched by a factor of 2 and shifted right by 3 units. B) Vertically stretched by a factor of 3 and shifted right by 2 units. C) Horizontally stretched by a factor of 2 and shifted left by 3 ...

**science**

20 + 25 divided by 2 to find the average.

**physicccccccccccccc**

this is not the answer for my question,i think nobody knows my question

**physicccccccccccccc**

I did answered my question but not sure weather is correct or not 1)How is X-ray produced and why can it be used to help us see the structure inside the body? X-rays are produced when electrons strike a metal target. The electrons are liberated from the heated filament and ...

**Statistics**

There are 8 possible outcomes 2^3 Since you either have a head or a tail and 3 coins. 2/8 or 1/4 HHH or TTT 6/8 or 3/4 for the other choices. 1/4 times 5 - 3/4 times 3 -$1

**physic**

I need the answer for these 2 questions: 1)How is X-ray produced and why can it be used to help us see the structure inside the body? 2)Describe the process of X-Ray computerised tomography. What information does this process provide that ordinary X-ray images do not?

**History**

In the twentieth century the United States entered the world arena as an international power. What are some major points that led the United States to this position? What are some important events that I should know? Thanks

**Statistics**

In how many different ways can a chemistry book, a calculus book, a history book and a dictionary be arranged on a shelf so that the chemistry book or the history book appears first?

**Statistics**

a pair of dice is tossed. find the probability of getting a total of 8.

**Statistics**

3 bolts and 3 nuts are in a box. 2 parts are chosen at random. Find the probability that 1 is a bolt and 1 is a nut.

**Statistics**

In how many ways can 10 different books be divided among a, b and c so that 5 given to A, to 3 to B and 2 to C.

**physics**

a cart is moving horizontally along a straight line with constant speed of 30m/s.a projectile is fired from the moving cart in such a way that it will return to the cart has moved 80m.at what speed,relative to the cart and at what angle to the horizontal must the projectile be...

**Maths**

show that the circles x^2 + y^2 - 10x - 8y + 18 = 0 and x^2 + y^2 - 8x - 4y + 14x = 0 do not intersect.

**stats homework **

A scratch card cost €5 and has two possible prizes. There is a 10% chance you get €5 back and a 1% chance you get €100. in all other cases, you get nothing. what are the expectation and standard deviation?

**Math**

$12.79

**Math**

$1,279.20

**Math**

What will it cost to frame a picture in the shape of a regular hexagon 52 cm on a side if the framing costs $4.10 a meter?

**Algebra **

Through how many radians does the second hand of the clock turn between 7:15am and 11:20am

**MUSIC**

which style period would electronics have the strongest impact on? A)Classical B)Romantic C)Twentieth century D)Baroque

**physic**

A small fly wheel fitted to a motor with a moment of inertia of 80 kg m² slows down from 9000 rpm to 5500 rpm in 7.5 seconds. For the fly wheel, calculate: • The rate of deceleration which you can assume to be constant • The braking torque.

**Biology**

Which of the following statements regarding DNA and RNA is true? DNA can melt while RNA cannot. DNA is resistant to alkaline hydrolysis while RNA is not. DNA contains phosphodiester bonds while RNA does not. DNA can form double helices while RNA cannot.

**Biology**

Which of the following features of the structure of double-stranded DNA is most important in recognition of specific base sequences by most sequence–specific DNA-binding proteins? The greater depth of the minor groove. The arrangement of sequence-specific functional ...

**Stats**

let x be a binomial random variable with expected valuee 4 and variance 2 a) What is P(X=3)? b) What is P(X<6)?

**Business**

I agree with you.

**Maths**

Y + 1/3 Y = 28000 4/3 Y = 28000 Y = 28000(3) divided by 4 Is the price of the television set.

**Statistics/Math**

Try doing 1/x or maybe x^3

**Math**

Multiply by 5.

**math**

p = 52/218 q = 166/218 n = 218. Your test will be comparing your p-value with .301 to see if it is the same or different. Ho: p = .031 Ha: p does not = .301

**Math**

Simone has been flipping a coin and has just flipped 5 heads in a row. she says that because she has just gotten so many heads, she is more likely to get tails than heads the next time she flips. Is Simone correct? What is the probability that her next flip will be a tail? ...

**Math**

how many three letter security codes can be made from 4 letters A,B,C,D without using a letter twice? For example, BAC and A,D,B are two such codes. Explain

**Check My Math Answers Please!**

10) set the quadratic equal to zero and then use the quadratic equation to solve. x = -b +- square root of (b^2-4ac) all of that is divide by 2a 11) the height has to be zero when it hits the ground. Set the equation = 0 and use the quadratic to solve. However, since this is ...

**Check My Math Answers Please!**

First one is correct. The second one should be "d". You can check these answers by putting them into the original equation. You should get zero for an answer because "O" is when it hits the ground. For 5 & 6 use the square root of b^2 - 4ac. If you get a ...

**MATHS**

The largest area is always a square. 18 feet plus the 3 foot gate = 21 feet. He needs that evenly divided for 3 sides so I would 7 feet on each side. However, the problem is that they come in 3 foot sections. So you have to work this out so that you get as close to a square as...

**maths geometry**

The maximum area is always a square. Divide the 2km/3 since they only need it for 3 sides. 2/3km on each side.

**math**

A worker was paid $218 for each day he worked and was fined $36 each day he was absent. at the end of 30 days he earned $5524. how many days he was absent?

**math**

Find the 10th term in an AP where the first term is 3 and whose 1st, 4th and 13th terms form a GP.

**MAth**

If you pay $950,000 for a car and its value depreciates 10% per year. how much will be its worth 5 years from now?

**Math**

cara uses 2/3 of a cup of almonds to make 4 cups of trail mix. how many cups of almonds would she use to make 9 cups of trail mix

**Math**

890

**MAth**

In a set of five consecutive positive even integers, the ratio of the greatest integer to least integer is 2 is to 1. If these integers are arranged from lowest to highest, which is the middle integer in the list?

**math**

The sum of the first 5 terms of a GP is 61. If the 5th term is 81 solve the value of the common ratio.

**chemistry**

In the predicted electron configuration of Molybdenum (Mo), how many electrons are in the 4d subshell? 2. How many electrons are in the 4d subshell of the Molybdenum (III) ion?

**math**

A pipe is cut into twp pieces. One piece has a length of 33 inches. If the other piece has a lenght of u inches, what was the total lenght of the pipe, in inches, before cut?

**stats homework**

A scratch-card costs 5¤ and has two possible prizes. There is a 10% chance you get 5¤ back and a 1% chance you get 100¤. In all other cases, you get nothing. Let X denote your net winnings, i.e, (X = prize - cost). What are the expectation and standard ...

**stats homework **

to estimate p, the proportion of all newborn babies who are male, the gender of 10,000 newborn babies was noted. if 5106 were male determine a) a 90 percent confidence interval estimate of p b) a 99 percent confidence interval estimate of p?

**Math**

A pet shop bought a litter of puppies for $120. All but four of them were sold, a a profit of $5 each, for a total of $120. How many puppies were in the litter.

**physics**

The force of interaction between two charges q1=6uC and q2=2uC is 12N. If charge q=-2uC is added to each of the charges then the new force of interaction is

**Math**

Cosmic ray bombardment of the atmosphere produces neutrons, which in turn react w/ nitrogen to produce radioactive carbon-14. Radioactive carbon-14 enters all living tissue through carbon dioxide. As long as it is alive, carbon-14 is maintained in the organism at a constant ...

**Physics**

31 m/s 23 ° north of east

**Program Design and Development**

Very basic pseudo code is what we're dealing with. New to OOP and I do not understand it. I'm not asking anyone to simply solve these problems but rather help walking me through them if possible. These are not assignments, just exercises from the book that I'm ...

**Program Design and Development**

Design a class called SimpleCalculator using psudoecode that contains public methods named add(), subtract(). Each of the methods accepts two numeric arguments and returns a number that represents the result of the appropriate arithmetic operation. Design a sub-class of ...

**Alabama **

gaseous butane reacts with gaseous oxygen gas to produce gaseous carbon dioxide and gaseous water. Suppose 38.9 g of butane is mixed with 35. g of oxygen. Calculate the maximum mass of water that could be produced by the chemical reaction. Round your answer to 2 significant ...

**ENGLISH**

In about (500 words)write a composition ending with "when i woke up i realised that it was only a dream"

**Math, Algebra (fast help would be nice)**

I would have assumed that you used paper to work out the problems before entering them into the computer. I would think doing it on paper would be the only way to do these problems.

**math**

(8,5) The best way to find this is to draw the other 3 points on a graph and it becomes quite clear that you need (8,5)

**Math**

q+ 3 = d .25q + .10d = 2.75 .25q + .10(q + 3) = 2.75 The above is a substitution. If you don't like working with decimals, multiply through by 100 25q + 10(q+3) =275 35q + 10q + 30 = 275 Can you finish from here?

**Math**

The square root of number that is two bigger than k is twice as big as the square root of the number one less than k. What is k?

**math**

A vertical mast is on top of building and is positioned 6 ft from the front edge. The mast casts a shadow perpendicular to the front of the building and the tip of the shadow is 90 ft from the front of the building. At the same time, the 24 ft building casts a 64 ft shadow. ...

**geometry**

A vertical mast is on top of building and is positioned 6' from edge of building. The mast casts a 90' shadow from front of building. Another building 24' tall casts a shadow 64'. What is the height of the mast?

**maths**

if the geometric mean of two numbers x and y is 6 find the geometric mean of the four numbers x,y,9x,9y

**statistics**

suppose a car is driven from town A to town B from town B to town C and from town C to town D which have equal distances at average speeds 20km/hr,60km/hr and 120km/hr respectively,what is the average speed for the whole journey

**statistics**

explain clearly the three meaning of "statistics" contained in the statement below "you compute statistics from statistics by statistics"

**Math**

particle P of mass m kg is attached to two fixed points A and B by two identical model springs, each of stiffness k and natural length l . The point A is at a height / l above the point B. The particle is free to oscillate vertically under gravity. The stiffness of each spring...