# Posts by john

Total # Posts: 8,369

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)?

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

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 ...

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 ...

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...

maths
if the arithmetic mean of four numbers is 20 and the arithmetic mean of other six numbers is 10 then,find the arithmetic mean of all the numbers taken as one group

maths
let the harmonic mean of two numbers x and y be 9.find the harmonic mean of the four numbers x,y,2x,2y

Throughout the season, drew scored 18 touchdowns. He scored 10 in the first 6 games. How many did he score in the last 4 games? Write the equation and solve.

Chemistry
Based on the ratio of mean moles of O2/mol KClO3 what is the chemical equation for the reaction that occurred? Why? Is this conclusion in accord with the mass of the solid product that you obtained? Explain Moles of O2/mol KClO3 = 1.95x10^-2

economics
if the CPI for the year 2004 is calculated as 96.5. compared to the base year what can we say about the general price of goods and services at 2004

Math
Carol has 8 3/4 yards of material. She needs to use 1/3 of the material to make a dress. How many yards of material will she need to make the dress?

health
what are nuts

Maths
The diagram shows a tent which has a rectangular base with vertical sides of height 2m, width 6m and length 8m, surmounted by a pyramid. The vertex,v, of the pyramid is 3m above the centre of the base of the tent Calculate the area of the triangular face VEF Calculate the area...

ICT
consider an organization as a computer system and identify its components

Science - hyperthyroidism
Hello, Can someone explain to me how does negative feedback loop work with a person whose condition is hyperthyroidism? How does graves disease effect the homoeostasis of the thyroid function and its production of hormones I am reading the book but it does not make sense at all.

Electricity and Magnetism
When you apply a magnetic field to a material it is observed that the magnetic field inside decreases. What material property have you observed? a) Paramagnetism b) Diamagnetism c) Ferromagnetism

MATHEMATICS
Find the curved and total surface area of a right circular cone,of base radius 8cm and height 10cm

Information Technology
what did Microsoft do to prevent viruses like Melissa virus?

Pre-cal
Determine two positive integers such as 5 less than two times the first number is the second number. The sum of the second number and the square of the first is 115.

Maths
What is the capacity of a cylinder tank of diameter 3.5m and height 4m in litres (pie22/7)

Math
a) the center is (5,-3) and the radius is the square root of 49 = 7. (x-a)^2+(y-b)^2 = r^2 is the formula for the circle. This is why the center values are the opposite of what is in the formula above.

Math
A + S=120 6A +4S = 600 Use substitution A= 120-S 6(120-S) + 4s = 600 720 -6S + 4S = 600 720 -2S = 600 Can you finish from here?

Algebra Susie is wrong
It says to evaluate. Therefore, just put the -4 in for the x^2 and simplify. (-4)^2 - 18 simplifies 16 -18 simplifies to -2 If this is an expression there should not be an = sign. I am assuming the -10 wouldn't be there.

Calculus - Derivatives
Use implicit differentiation to find the second derivative y'' of the function given. x^2 + 5y^3 = 8

Electricity and Magnetism
Consider free protons following a circular path in a uniform magnetic field with a radius of 1m. At t =0s, the magnitude of the uniform magnetic field begins to increase at 0.001 T/s . Find the tangential acceleration of the protons .

Government
Does Japan have a stronger civil society than South Korea?

maths for management
suppose a retail business sells its commodity at a margin of 25% on all items purchased and sold.moreover the company used a 5% commission as saving expense and 12000 at a fixed cost.find the breakeven revenue

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