Saturday

April 19, 2014

April 19, 2014

Total # Posts: 161

**Liberty**

What is the sample Z score to reject the null hypothesis if the cut off Z score +-2.31?

**statistics**

A population is normally distributed with mean 30, population SD =10, Sample size 25. What are the mean and variance of the distribution of means, respectively?

**Math**

Samantha swam 30 meters to a boat in 16 seconds. How long did it take her to swim each meter? I worked it out this way 8/15 x 30 = 240/15 240 divided bt 15 = 16 seconds my teacher said I was wrong and said the answer was 30/16????

**Math**

Samantha swam 30 meters to a boat in 16 seconds. How long did it take her to swim each meter? How would I work this out? Thank You

**physics**

A 0.40 kg mass is attached to a spring with force constant 26 N/m and released from rest at a distance of 3.2 cm from the equilibrium position Use conservation of energy to find the speed of the spring when it is halfway to the equilibrium position Find the maximum speed of th...

**math **

the price of a fax machine is marked down from $305 to $262.30. what is the rate of discount

**maths**

A die is thrown twice. Find the probability that the number obtained in the first throw is smaller than that in the second throw.

**maths**

A group of y numbers has mean x. If the numbers 3 and 5 are removed from the group, the mean of remaining(y-2) numbers remains unchanged. Find x.

**Finite Math**

True or false. [A ¿ (B ¾ C)]c = (A ¿ B)c ¿ (A ¿ C)c

**Finite Math**

True or false. P (n, r) = r! C (n, r). explain why please, thanks

**english**

D secondary research

**Computers C++**

1). After the assignment statement result = isspace('\t'); result has the value ________. 2). The data type of islower('g') is ________. 3). What will be output given the following information: float * pointer; float pay = 3.75; pointer = &pay; cout << &p...

**math**

if i have a mix of 4oz. to 100lbs. how much would it be for 9Lbs.

**math**

2(n+3}<-4

**chemistry**

RANK THESE COMPOUNDS BY THE LENGTH OF THE CARBON-CARBON BOND

**Trigonometry**

rectangular form to polar form xy=12 rsinÆŸ rcosÆŸ=12 would the answer be: r^2=12/cosÆŸ sinÆŸ please show steps, Thanks

**math **

9/20 how do I multiply & simplity

**algebra**

(1) T in terms of A is alike to Y in terms of X for linear graphs, so set it up the same way. T = (something)A + constant The constant reading is 200 miles per hour so that is your constant. T = (something)A + 200 The true airspeed is increasing by 2% or .02 of the indicated r...

**Math**

Use all ten digits from 0 to 9 only once. Do not use 0 in either the milions or thousandths places. What is the greatest number less than 5 million?

**math**

Alternate exterior angles are always ?

**algebra**

a – 6 = 2b a + b = 15

**algebra**

Solve by setting up the proper equation to describe the facts given and then carrying out the mathematical calculations to solve for the unknown variable(s). The sum of two numbers is 36. Their difference is 4. Determine the two unknown numbers.

**pre algebra**

solve whether the sequence is arithmetic or geometric if it is arithmetic or geometric,state the common difference or common ratio and write the next three terms of the sequence 10,18,26,34

**Probability**

6 sided die is rolled 8 times, how many sequence of rolles are there?

**AP Chemsitry**

A solution of an unknown monoprotic weak acid was titrated with 0.100 M NaOH. The equivalence point was reached when 37.48 ML of base had been added. From a second buret, exactly 18.74 of 0.100 M HCl were added to the titration solution. The pH was then measured with a pH mete...

**physics**

A turntable must spin at 33.7 rpm (3.53 rad/s) to play an old-fashioned vinyl record. How much torque must the motor deliver if the turntable is to reach its final angular speed in 1.5 revolutions, starting from rest? The turntable is a uniform disk of diameter 30.5 cm and mas...

**physics**

A spinning flywheel has rotational inertia I = 401.9 kg · m2. Its angular velocity decreases from 20.5 rad/s to zero in 257.1 s due to friction. What is the frictional torque acting?

**physics**

You are asked to hang a uniform beam and sign using a cable that has a breaking strength of 372 N. The store owner desires that it hang out over the sidewalk as shown. The sign has a weight of 248 N and the beam's weight is 49 N. The beam's length is 1.30 m and the sig...

**Physics**

A house painter stands 3 m above the ground on a 5.3-m-long ladder that leans against the wall at a point 4.7 m above the ground. The painter weighs 638 N and the ladder weighs 143 N. Assuming no friction between the house and the upper end of the ladder, find the force of fri...

**chemistry**

you are given an unknown gaseous binary compound. when 10.0g of the compound isburned in excess oxygen, 16.3g of water is produced. the compound has a density 1.38 times that of oxygen gas at the same conditions of temperature and pressure. give a possible identity for the com...

**chemistry**

you are given an unknown gaseous binary compound. when 10.0g of the compound isburned in excess oxygen, 16.3g of water is produced. the compound has 1.38 times that of oxygen gas at the same conditions of temperature and pressure. give a possible identity for the compound.

**microeconomics**

Immigration is a major topic of concern in today’s economy. What are the possible problems and solutions for these concerns? What could happen to the U.S. labor markets if immigration is not controlled?

**microeconomics**

Many factors determine the supply and demand for labor. Identify and explain two factors that would increase or decrease the demand for labor. Identify and explain two factors that would increase or decrease the supply of labor. Use the readings and/or the internet for examples

**Microeconomics**

Answer the following questions based on the graph that represents J.R.'s demand for ribs per week of ribs at Judy's rib shack. a. At the equilibrium price, how many ribs would J.R. be willing to purchase? b. How much is J.R. willing to pay for 20 ribs? c. What is the m...

**grammer**

find italicized test

**physics**

You have four vectors. For each one resolve them into North and east components. Adding the North components. N= 75 + 0 + 125 sin(30) - 150 = - 12.5 m And adding the east components we get E = 0 + 250 + 125 cos(30) + 0 = 358.25 The magnitude of the result is found by Pythagora...

**trig**

If S is an element of [ 3pi/2 , 2pi ] what quadrant does the terminating side lie in and evaluate for sine theta

**Chemistry II**

Liquid sodium can be used as a heat transfer fluid. It's vapor pressure is 40.0 torr @ 633 degrees C and 400.0 torr @ 823 degreees C. Calculate it's heat vaporization.

**Chemistry**

Write the balanced net ionic equation. Label species as solids liquids gase aqueous. HNO3(aq) + Ba(OH)2(aq) ---> I don't understand the steps? And how to balance it?

**College Algebra**

Sorry, the question is "A person is 66 inches tall is standing 15 feet away from a streetlight. If the person casts a shadow 84 inches long, how tall is the streetlight?"

**College Algebra**

If a person is 66 inches tall is standing 15 feet away from a streetlight. If the person casts a shadow 84 inches long, how tall is the streetlight?

**kettering elementary school**

what do you do when you have 10 or more ones

**biology**

why is the cell membrane important to people?

**m-100**

Sketch the graph of each linear function. Give the domain and range. (a) f(x) = -2x + 1 (b)f(x) = -3.

**m-100**

write an equation for the srtaight line that satisfies the given conditions. (a) Through (-2,-2); slope -1 (b) Through (4,2); slope 1/2.

**m-100**

find the slope-intercept form of the straight lines,given by the following equations: (a) -4x + 2y =4 (b) 2x = 1-4y

**math**

if a basketball player shoots 50 free throws and makes 23% of them,how many free throws did he make?

**math**

simplify (6x^3-7x^2+3x+9)/(3x+9)

**science**

Scientists performed an experiment to determine whether there is a connection between learning ability and food. They took two groups of 20 mice each, all from the same purebred strain. The mice were deprived of food for 3 days and then given a standard learning session in run...

**geometry**

what is the perimeter of trapeziod (-3,3) (-5,0) (2,3) (4,0)

**math**

i solved by factoring like this: 3x^2+5x-12=0 (3x+4)(x-3) -4 +3 x=-4 x=3 now i need to solve by the form x^2=k How do I do that?

**physics**

a car is approaching a traffic light at 25m/s when it turns red. The driver takes 1 second to react and put his foot on the brake pedal, after which the car decelerates at 2m/s^2. find the distance needed for the car to come to stop after the light turns red

**physics**

a girl throws a ball vertically upwards at 5m/s from the roof of a building 20m high how long will it take the ball to reach the ground? and what will its speed be when it strikes the ground

**Algebra**

Sam two student loans totaled $31,000. One of his loans was at 2.8% simple interest and the other at 4.5%. After one year, Sam owed $1024.40 in interest. What was the amount of each loan?

**physics**

The velocity of a diver just before hitting the water is -8.8 m/s, where the minus sign indicates that her motion is directly downward. What is her displacement during the last 0.93 s of the dive?

**physics**

The velocity of a diver just before hitting the water is -8.8 m/s, where the minus sign indicates that her motion is directly downward. What is her displacement during the last 0.93 s of the dive?

**government**

The President's power to veto congressional legislation and the requirement that Congress confirm the President's nominees to the Supreme Court are both examples of what?

**calculus**

At what values of x does the function f(x)= x(x-4)^4 have a horizontal tangent line?

**math**

At what values of x does the function f(x)= x(x-4)^4 have a horizontal tangent line?

**algebra**

Find two possible numbers that differ by 8 and whose reciprocals differ by 1/6.

**buisness**

ok could you help with the general answer to the questions, the article didnt help out much. Which industries have substantially reduced fixed cost commitments? Do you believe this reduction in costs has substantially impaired the ability of these industries to meet the needs ...

**buisness**

yes i read the article.

**buisness**

Industry downsizing has been a major part of the corporate world, even government agencies are downsizing. GovernmentExecutive website "covers the business of the federal government and its huge departments and agencies - dozens of which dwarf the largest institutions in ...

**buisness**

Throughout the corporate world, businesses are transforming labor into a more flexible (and variable) cost. Among such companies are Hewlett-Packard, General Electric, DuPont, Sun Microsystems, and British Airways. Discuss whether direct labor is a fixed or a variable cost. W...

**Physics**

A skydiver has a terminal velocity of 9.0 m/s. If they have a mass of 98, what is their k value for their air resistance? Use g = 10 m/s/s and do not report units on your answer, they should be N s/m.

**Physics**

A skydiver has an air resistance force of 1193 N and a mass of 94 kg, what is her current acceleration? Take down to be POSITIVE and use g = 10 m/s/s. Please report your units as "m/s/s"

**2nd grade math**

Impossible

**2nd grade math**

Impossible

**Physics**

A 3.0 kg block is being pulled with a horizontal force of 29.7 N. If the block is accelerating at 3.2 m/s/s, what is the coefficient of kinetic friction between the block and the table?

**algebra**

15000(1+0.07/2)^2*4

**English**

I want to ride. What parts of speech are to ride in this sentence.

**5th grade**

use a flow map to help you figure out the missing number. be sure to use arrows to show the direction of your map, and make sure you have a title. clue 1 i am a multiple of 3 clue 2 i am between the numbers 15 and 36 clue 3 when you add my two numbers together you get th sum o...

**math**

yes

**math**

use a flow map to help you figure out the missing number. be sure to use arrows to show the direction of your map, and make sure you have a title. clue 1 i am a multiple of 3 clue 2 i am between the numbers 15 and 36 clue 3 when you add my two numbers together you get th sum o...

**geometry**

That was my first thought but it seems to easy to be true!!!!

**geometry**

Find the area of a square given that the length of each of its sides is 1/4 the value of its area.

**CSC 111 Intruduction to Computer Science**

What does it imply to pursue a computer science major in the 21st century?

**mat 101**

What would my balance be if I had $100 in a savings account that had a 2% interest rate and I kept the account for a 5 year period, using continuos compounding?

**mat 101**

Equation for a line that passes through (6,26) and has a slope of 3 Equation for a line that passes through the points (5,5) and (10,20) Equation for a line that passes through (9,25) and has a slope of -3. Equation for a line that passes through (1,) and is perpendicular to t...

**History**

What does the treatment of the colonies by their European powers tell you about their views of these colonists and natives?

**math**

No. Unless you use pentagons and octagons in a configuration similar to what is commonly found on a soccer ball

**Chemistry**

Gasohol contains ethanol (C2H4OH)(l), which when burned reacts with oxygen to produce CO2(g) and H2O(g). How much heat is released when 12.5g of ethanol burns? C2H5OH(l) + 3 O2(g) --> 2 CO2(g) + 3H2O(l) Delta H = -1368kJ

**pre calc**

solve following using "elimination method" 3x^2 + 4y = 17 2x^2 + 5y = 12

**Pre Calc**

Thanks

**Pre Calc**

x^2+y=9, x-y+3=0. Need to solve using substitution method.

**Pre Calc**

x^2+y=9, x-y+3=0. Need to solve using substitution method.

**3rd grade**

What is the key words of the Vowel Pair and the Vowel Digraph?

**Biology**

Luteinizing hormone (LH) and follicle-stimulating hormone (FSH) are called gonadotropins because stimulate the gonads - in males, the testes, and in females, the ovaries. They are not necessary for life, but are essential for reproduction. These two hormones are secreted from ...

**Chemistry**

Distinguish between efflorescent and hygroscopic substances.

**Chemistry**

Distinguish between efflorescent and hygroscopic substances.

**Chemistry**

what do limiting reagents have to do with... 5F2(g) + 2NH3(g) ==> N2F4(g) + 6HF(g) a)If you have 66.6 g NH3, how many grams of F2 are required for complete reaction? b)How many grams of NH3 are required to produce 4.65g HF? c)How many grams of N2F4 can be produced from 225g...

**Chemistry**

what does limiting reagent have to do with problems a, b, and C?

**Chemistry**

The reaction of flourine with ammonia produces dinitrogen tetrafluoride and hydrogen fluoride. 5F2(g) + 2NH3(g) ==> N2F4(g) + 6HF(g) a)If you have 66.6 g NH3, how many grams of F2 are required for complete reaction? b)How many grams of NH3 are required to produce 4.65g HF? ...

**Chemistry**

The equation below shows the incomplete combustion of ethene. C2H4(g) + 2O2(g) ==> 2CO(g) + 2H2O(g) If 2.70 mol C2H4 is reacted with 6.30 mol O2, a) identify the limiting reagent. b) calculate the moles of water produced. Show all steps.

**Chemistry**

What is the percent yield if 4.65g of copper is produced when 1.87g of aluminum reacts with an excess of copper(II) sulfate? 2Al(s)+3CuSO4(aq)==>Al2(SO4)3(aq)+3Cu(s)

**10th grade**

how to simplify radicals

**algebra 2**

Why is a stick of gum like a sneeze?

**Physics**

A police car is traveling east at 40.0 m/s along a straight road, overtaking a car ahead of it moving east at 30.0 m/s. The police car has a malfunctioning siren that is stuck at 992 Hz. What is the wavelength behind the police car in meters?

**Physics**

A block of mass M hangs from a rubber cord. The block is supported so that the cord is not stretched. The unstretched length of the cord is L_0 and its mass is m, much less than M. The "spring constant" for the cord is k. The block is released and stops at the lowest...

**physics**

What is the right answer? Do you know?