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Posts by zac

Total # Posts: 142

statistics
Consider an upper-tail test of hypothesis for the difference in two population means. The sample data from the first population is: n = 50, x-bar = 110, s = 10. The sample data from the second population is: n = 75, x-bar = unknown, s = 11. We conclude the alternative ...

Literacy
think about the various conflicts in dragonwings. identify and describe one event from the novel that represents a cause and effect relationship that creates conflict. explain the effect the conflict has on other characters in the story.

English II
The answer is A

Education technology
your right

physics
A certain pendulum on Earth has a period of 1.6 s. What would be the period of this pendulum if it were taken to another planet that had 1.75 times the mass of the Earth and 2.5 times the Earth's radius? Express your answer in seconds to three significant digits.

physics
With what frequency would you have to push a child on a swing that had supporting chains that were 2.3 m long? Express your answer in Hz to 3 significant digits.

physics
A simple harmonic oscillator has a frequency of 2.05 Hz. What will be its amplitude of oscillation if it's started from its equillibrium position with a velocity of 1.9 m/s? Express your answer in m to three significant digits.

physics
What is the maximum velocity of a spring oscillator with a mass of 0.7 kg and a spring constant of 74 N/m that is released from rest at a position of x = 0.1 m?

physics
A mass hung from a spring stretches the spring by 11 cm when the mass is resting at its equillibrium position. What will be the frequency of oscillation of this system if the mass is put in motion?

genetics
1) Which of the following is a characteristic of RNA splicing in Eurkaryotes? a) Exon/intron boundaries are typically characterized by a 5' GU splice junction and a 3' AG splice junction. b) After splicing occurs, the U1, U2, U5, U6 snRNP complex removes remaining ...

Algebra
The sum of two numbers is 83. The difference of the two numbers is 24. Find the two numbers.

Algebra
The sum of two numbers is 83. The difference of the two numbers is 24. Find the two numbers.

Physics
39.9 mi/h

Chemistry
Determine the freezing point of an aqueous solution containing 10.50 g of magnesium bromide in 200.0 g of water.

DRAONWINGS HELP! ASAP! LA
The answers for chapters 10-11 if you go to connections academy d d b d

S.S. Check answer!
lilganster and derp are right. I got 100%

Calculus - Differentiation
Differentiate: y = 3/(1-6x^4)

chemistry
A sample of 131 I was purified and then analyzed for iodine content. It was found that the sample was 99.8% pure. 25 hours later the sample was tested again and it was found that the sample was now just 78.2% pure. What is the half - life of 131 I?

L.A.Help!!!!!!
thank you Amanda Fire

Physics
A skateboarder moving at 7.18 m/s along a horizontal section of a track that is slanted upward by 48.5 ° above the horizontal at its end, which is 0.741 m above the ground. When she leaves the track, she follows the characteristic path of projectile motion. Ignoring ...

math
A and B weigh 156 pounds. A and C weigh 171 pounds. How much do they each weigh if the total weight is 255 pounds?

math
Is 16.6 a rational number

Calculus
State the cartesian equations of two lines that make angle of 60 degrees with the line r=(1,3)+s(1,1)

Calculus
Find the scalar equation of a plane that is perpendicular to plane r=(-2,1,3)+s(0,1,1)+t(-1,0,3) and also intersects it along the line (x-3)/2=(y+1)/-3,z=1

math
I need an answer to this also.

Math
The denominator of a fraction is four more than twice the numerator. If both numerator and denominator are increased by six, the simplified result is 7/13. Find the original fraction

statistics
Consider an upper-tail test of hypothesis for the difference in two population means. The sample data from the first population is: n = 50, x-bar = 110, s = 10. The sample data from the second population is: n = 75, x-bar = unknown, s = 11. We conclude the alternative ...

statistics
A random sample of 100 students from a high school was selected. If a 98% confidence interval estimate for the mean age of students is calculated to be 14.2511 to 14.9489, then the standard deviation of the sample mean is?

statistics
A management consultant has analysed a random sample of 40 large firms in order to investigate the mean annual salary of sales managers. She has constructed the following 90% confidence interval for the population mean annual salary: $45,382 to $48,618. In testing the ...

statistica
A management consultant has analysed a random sample of 40 large firms in order to investigate the mean annual salary of sales managers. She has constructed the following 90% confidence interval for the population mean annual salary: $45,382 to $48,618. In testing the ...

Chemistry
How many sulfate ions are there in 2.500 mL of 5.0 x 10-15 moles of Cr2(SO4)3?

math
integers of 34 Add= Sub.= div.= multiply=

Chemistry
A student begins with 25 mL of a 0.434 M solution of HI and slowly adds a solution of 0.365 M NaOH. 1. What is the pH after 15.00 ml of NaOH solution has been added? 2. What is the pH after 40 ml of NaOH solution has been added?

Chemistry
Claculate the voltage of the following cell at 25 Degress Celcius. 2Ag (aq) (0.010M) + Cu(s) -> Cu^2(aq)(0.1M) +2Ag(s)

algebra
identify conic section, its lines of symmetry and the domain and range

calculus
Show that ln(4+x) is the sum of its Taylor Series for -2 <= x <= 2.

physics
A point charge of -4.00 is at the origin, and a second point charge of 6.00 is on the axis at = 0.850 . Find the magnitude and direction of the electric field at each of the following points on the axis. a) x=25.0cm b) x=1.10m c) x=-15.0cm

math
First put the perpendicular line equation into y=mx+b form. Your first step should be to subtract the 10y from both sides. Then using the y = mx + b equation, you know the slope of the parallel line. Your line is perpendicular to the m value in the new equation. To find the ...

calculus
The z is supposed to be an upside down y (thats the best description I can think of).

calculus
For what values of z will (2-z)-y = 0 4x+(1+z)y = 0 have an infinite number of solutions.

calculus
Find the parametric equations for the line that contains the point (3,1,-4) and is parallel to the line r(t)=(1+2t)i+(-3-t)j+(5+5t)k

calculus
Find parametric equations for the line that is perpendicular to the plane 2x-y+3z=7 and intersects the plane when x=1 and y=1.

Pre-Calc
Given the one point function (3,9) (in other words f(3)=9) Identify the following transformations f(2x) -3(f(x-4))+1 f(5x+3) 4f(-x)

Pre-Calc
Thanks a lot for your help

Pre-Calc
wouldnt the "1"in the 1+.... in the 4th step become r^2 when you multiply both sides by r^2.

Pre-Calc
Convert r=1+3sin2x from a polar equation to a rectangular equation.

math
The principal of Valley Elementary School wants to divide each of the three fourth-grade classes into small same-size groups with at least 2 students in each. If the classes have 18, 24, and 36 students, respectively, what size groups are possible?

math
how long to the nearest year will it take an investment in germany to double its value if the interest is compunded every six months

math
the high of a trapezoid is 10ft the upper base is 6ft shorter then the lower base if the area of the trapezoid is 50 square ft how long is the upper and lower base?

algebra 1
place parenthesis so answer = 14. 2x2+3 to 2nd power-4+3x5.

Physics
A 140 g, 90.0 mph fastball comes across the plate very nearly horizontally and is batted at 90.0 mph at a 30.0 O angle (above the horizontal) toward center field. (a) Determine the impulse (in N.s) acting on the ball. (b) If the impact time is 0.00080 s, determine the average ...

Physics
A 125 kg flatbottomed boat is floating along at 5.0 m/s, headed east. Sally Sue, standing at one end of the boat, starts to walk at 2.0 m/s, also to the east. If Sally’s mass is 65 kg, what is the speed of the boat as she walks along?

physics
A 125 kg flatbottomed boat is floating along at 5.0 m/s, headed east. Sally Sue, standing at one end of the boat, starts to walk at 2.0 m/s, also to the east. If Sally’s mass is 65 kg, what is the speed of the boat as she walks along?

Physics
In the Daytona 500 car race in Daytona, FL, a curve in the oval track has a radius of 316 m (near the top of the curve) and is banked at 31.0 O . a) What speed would be necessary to make this turn if there was no friction on the road? b) If the coefficient of static friction ...

Physics
A popular carnival ride consists of a large, round room that rotates fast enough that any person standing against the wall will be stuck there, even as the floor is dropped away from their feet. The coefficient of static friction between the person and the wall is μs , ...

Physics
The Hubble Space Telescope (HST) has recorded evidence of a black hole at the center of the M87 galaxy. Using Doppler data, it's been measured that matter is orbiting the center of this galaxy at an orbital speed of 7.5x10 5 m/s, out at a radius of 5.7x10 17 m. Calculate ...

Physics
Assume the Earth is a perfect sphere of radius 6,400 kilometers. Find the weight of a 75.0 kg person at the North pole. Find the weight of this same person at the equator. (You don't need to use Newton's Law of Gravitation but you do need to analyze the radial/...

Physics
Starting from rest, a 6.70 kg object falls through some liquid and experiences a resistive (drag) force that is linearly proportional to the velocity of the object. It's measured that the object reaches half its terminal speed at 4.50 s. a) What is the terminal speed for ...

Physics
A car with fuzzy dice hanging from the rear view mirror by a single string drives along at a constant 25.0 m/s. a) If the dice have a mass of 0.030 kg, what is the angle of the string (relative to vertical)? b) What is the tension in the string? c) As the driver takes a turn ...

Physics
Consider a spider walking from the top of a (stationary) beach ball. (Let that angular position = 0 O .) The spider finds it loses its grip when the normal force between it and the surface is less than 1/2 of its weight. At what angle does this slipping begin?

Physics
A block of mass m = 2.00 kg rests on the left edge of a block of mass M = 8.00 kg. The coefficient of kinetic friction between the two blocks is 0.300, and the surface on which the 8.00- kg block rests is frictionless. A constant horizontal force of magnitude F = 10.0 N is ...

Physics
Mass 1 and mass 2 are connected as shown by a massless, non-stretch rope that passes over a massless, frictionless pulley. The masses are on inclines which have friction. When the angles of the string are as given, mass 1 experiences an acceleration up the incline of 1.00 m/s/...

Physics
A 12.0 kg block sits on a frictionless table. On top of this block is placed a 5.00 kg block. The coefficient of static friction between the two blocks is 0.70. a) What is the maximum force that can be applied horizontally to the 5.00 kg block before it slips? b) What is the ...

Physics
A 90.0 kg block and a 40.0 kg block are connected by a rope that passes through two (frictionless, massless) pulleys as shown. When released, what is the acceleration of the larger block? What is the tension in the rope?

Physics
A box starting from rest, slides down an incline which makes an angle of θ above the horizontal. The incline has a maximum height of h above the platform on which it sits which is itself H above the ground. The box leaves the end of the ramp and platform's edge and ...

Physics
An ice skater slides (without pushing) across a frozen pond for 25.0 m before coming to a stop. If the coefficient of kinetic friction is 0.050, how fast was the skater initially moving?

calculus
A trough has a trapezoidal cross section with a height of 5 m and horizontal sides of width 2.5 m and 5 m. Assume the length of the trough is 14 m. How much work (in joules) is required to pump the water out of the trough (to the level of the top of the trough) when it is full...

Physics
I understand but you didn't put 10(initial height) into any of the equations?

Physics
Sally Sue is atop a 10.0 m high platform where she will drop an apple straight down. On the ground below, and 20.0 m (horizontally) away, Betty Lou will shoot an arrow at the apple. If Betty's arrow has a release speed of 25.0 m/s, at what angle must she fire that arrow, ...

Physics
Seawater has a bulk modulus of 2.34×109 N/m2. Its density at 5°C is 1030 kg/m3. What is the speed of sound through seawater at this temperature?

math
kevin had a board that was 5 and 1/4 feet long. while making making a fence, he cut a peice 3 and 3/4 feet long from the board. what was the lenth of the peice of board remained?

algebra 2
List all possible rational zeros of each function. f(x)=4x^5+4x^2-9 Find all rational roots of each function f(x)=2x^3+x^2+8x+4

algebra
find all the zeros of each function. 1. f(x)=2x^4-13x^3-34x^2+65x+120 2. f(x)=4x^4+19x^2-63

Chemistry
0.200 moles of NaF are added to 1L 2.0 molar HF. The Ka = 7.2*10^-4. What is the pH? a) 2.14 b) 6.70 c) 10.80 d) 3.00 e) 7.00 I got 4.14. pH = -log(Ka)-log([NaF]/[HF]) ==> pH = -log(7.2*10^-4)-log(.2/2) ==> pH = 4.14 Or did I do something wrong?

Chem (please read soon)
50.0mL of 0.1 molar NaOH is added with 50.0mL of 0.1 molar CH3COOH. The Ka = 1.8*10^-5. what is the pH of the solution? a) 7.00 b) 9.22 c) 4.77 d) 8.22 e) 5.78 I think that the answer is d. Would i be safe in saying that?

Chemistry
0.200 moles of NaF are added to 1L 2.0 molar HF. What is the pH? a) 2.14 b) 6.70 c) 10.80 d) 3.00 e) 7.00

Chemisty (please read soon)
which will become a buffer in 1L of H2O? a) 0.3 mole KOH & 0.3 mole HBr b) 0.5 mole NH3 & 0.5 mole HCl c) 0.2 mole NaCl & 0.3 mole HCl d) 0.2 mole NaOH & 0.2 mole HBr e) 0.4 mole HC2H3O2 & 0.2 mole NaOH I think that the answer is e. Is that correct?

Chemistry
50.0mL of 0.01M Ba(OH)2 is added to 150.0mL of 0.01M HNO3. What is the new pH of the solution?

calculus
A stone is thrown straight down from the edge of a roof, 750 feet above the ground, at a speed of 7 feet per second. A. Remembering that the acceleration due to gravity is -32 feet per second squared, how high is the stone 5 seconds later? B. At what time does the stone hit ...

english
Main Idea: The big rivers in the center of the United States have a constant power that is greater than the human uses for the rivers. I need to provide 3 supporting details for main idea.

Statistics
5. Scores on a recent national statistics exam were normally distributed with a mean of 80 and a standard deviation of 6. a. What is the probability that a randomly selected exam will have a score of at least 71? b. What percentage of exams will have scores between 89 and 92? ...

physics
A hawk flies in a horizontal arc of radius 15.7 m at a constant speed of 3.8 m/s. Find its centripetal acceleration. Answer in units of m/s 2 006 (part 2 of 2) 10.0 points It continues to fly along the same horizontal arc but increases its speed at the rate of 1....

geography
I would like your help please? The United Kingdom is currently experiencing one of the most severe financial situations for decades. Many Large scale Government development plans have been scraped. The attention of politican is turning to an ongoing project for many years ...

Physics
How long does it take a 23 kW steam engine to do 8.8 x 10^7 J of work?

differential equations
Solve the following equation explicitly by expanding up to order x5, the following 2nd order diff equation. y''(x) = (1 + x^2)*y(x) pls show working y =f(x)

Cal
Express the given quantity in a single logarithm. ln(a + b) + ln(a - b) - 2 ln c

Math
graph each linear function. y= -x + 4 y= 2/3x + 1 y= 2x + 1 y = -1/2x + 3

math
How many possible outcomes are there for 15 coins tossed simultaneously?

science
An abiotic factor that starts with c and the clue is soil type. So what is a soil type that starts with C?

math
-3/8 less or gereater than -1

math
is -3+(-3) less than or greater than -6

math
i get it now

math
is 10^2 less thans or greater than -200?

Physics
A 86.0-kg man is riding an escalator in a shopping mall. The escalator moves the man at a constant velocity from ground level to the floor above, a vertical height of 5.50 m. What is the work done on the man by each of the following forces?

math
If Sally can paint a house in 4 hours, and John can paint the same house in 6 hour, how long will it take for both of them to paint the house together? This the ans 2 hours and 24 minutes but how did they work it out?

math
If Sally can paint a house in 4 hours, and John can paint the same house in 6 hour, how long will it take for both of them to paint the house together? This is the ans. 2 hours and 24 minutes But how they work it out?

math
If Sally can paint a house in 4 hours, and John can paint the same house in 6 hour, how long will it take for both of them to paint the house together?

MATH
Find each percent of markup. (a) The wholesale price is $34. The retail price is $42.50.

us history
what events led to u.s. expansion during 1895-1920?

algebra 2
Which binomial is a factor of f(x) = x4 - 27x2 -14x + 120? (x-4) (x-2) (x + 5) (x + 6)

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