Saturday

April 25, 2015

April 25, 2015

Total # Posts: 2,473

**MATH**

Solve for y in the following system of equations: x - y = -1 3x + 5y = 21
*January 13, 2011*

**Math**

if log(x+1) 27=3 find the value of x *(x+1) is the base i know that the answer is 2 but i have no clue how to get that
*January 13, 2011*

**Statistics**

"Buy a Match 6 lottery ticket every day until you win the lottery. (In a Match 6 lottery, a player chooses 6 different numbers from the set {1, 2, 3, ..., 44}. A lottery representative draws 6 different numbers from this set. To win, the player must match all 6 numbers, ...
*January 13, 2011*

**science**

when do plates have the most potential energy
*January 11, 2011*

**Math**

The height of the tide in a given location on a given day is modelled using the sinusoidal function h(t)=5 sin (30(t-5))+7. a) What time is high tide? What time is low tide?
*January 10, 2011*

**Life Span Development**

Someone tells you that she has analyzed your genetic background and environmental experiences and concluded that environment definitely has had little influence on your intelligence. What would you say about this analysis?
*January 9, 2011*

**math**

A grocer get food from three suppliers. They deliver every 5 days, 6 days, and 7 days, respectively. All three came today. When will they all deliver on the same day again?
*January 6, 2011*

**social studies**

why does the 21st century include 2011
*January 5, 2011*

**marketing**

Imagine that you are a mentor to a new employee at a marketing firm. The new employee is having trouble understanding what the term market communication really means.
*January 3, 2011*

**english**

Verbs that form their past and past participle by adding ed , d , or t to the present are called a) regular. b) irregular
*January 3, 2011*

**English**

Read the following sentence. Decide if the verb is used as transitive or intransitive. The sun rose over the mountain. 1)transitive 2)intransitive
*January 3, 2011*

**Statistics**

Ohhh I get it now! Thanks so much!
*January 2, 2011*

**Statistics**

A coin is tossed five times. Find the probability of getting four tails. I realize that getting four tails is the exact same thing as getting only one heads, but how would you figure out this problem using probability rules? Thanks for your time, I appreciate it :]
*January 2, 2011*

**math**

hi i made a typo in my last question can u please show me step by step how to simplify [(x^3/y^3) -1]/[(x^2/y^2)+(x/y)+1]
*January 2, 2011*

**math**

[(x^3/y^3) -1]/[(x^2/y^2)+(x/y)+1] is right yes please help
*January 1, 2011*

**math**

how do i simplify [(x^3/y^3) -1]/[(x^2+y^2)+(x/y)+1]
*January 1, 2011*

**Math**

The point (-8,3) lies on the terminal arm of angle theta in standard position. Determine the primary trigonometric ratios for angle theta and calculate the value of theta to the nearest degree. Only the sine ratio was positive, and when I used that to calculate the angle, it ...
*December 27, 2010*

**Math**

State the restrictions on the variables for these trigonometric identities. a)(1 + 2 sin x cos x)/ (sin x + cos x) = sin x + cos x b) sin x /(1+ cos x) = csc x - cot x
*December 22, 2010*

**math**

im helping my brother with his homework but i completely forgot how to do this? Solve the system by substitution: y=3x-4 x+5y=-4
*December 21, 2010*

**General Chemistry**

According to the following reaction, how many moles of Fe(OH)2 CAN FORM FROM 175.0 mL of 0.227 M LiOH soultion? Assume that there is an excess of FeCl2 FeCl2(aq)+ 2 LiOH(aq)-(Oh)2(s)+2LiCl(aq) I have no clue how to approach this problem? Could anyone help me? I do not know ...
*December 17, 2010*

**Math**

Cliff has some money he wants to invest for his retirement. He is offered two options: 1. 10%/a simple interest 2. 5%/a compounded annually Under what conditions should he choose the first option?
*December 15, 2010*

**Math**

Under what conditions should he choose the first option? Explain.
*December 15, 2010*

**Math**

Cliff has some money he wants to invest for his retirement. He is offered two options: 1. 10%/a simple interest 2. 5%/a compounded annually
*December 15, 2010*

**Physics**

How does the index of refraction relate to the speed of light in a substance?
*December 14, 2010*

**Physics **

When an object is immersed in a fluid describe the buoyant force?
*December 14, 2010*

**Physics**

A 1.5kg frog on a string is being dragged along a table with a force of 12N. If string makes a 60 degree angle with the table, and the co efficent for friction is 0.15, what is the accleration of the frog.
*December 14, 2010*

**chemistry**

The boiling point of an aqueous solution is elevated by 0.15 degrees celcius. the change in freezing point of the solution, delta T, is? a.) -6.32 b.) 0.15 c.) -0.15 d.) 0.54 e.) -0.54 I know the answer is d, i just don't understand how to get it! thanks!
*December 14, 2010*

**calculus**

D. Plugging 2 into original fxn gives you y-coordinate. (2,6) Taking the derivative of y=(x^3)-x gives you f'(x)=3x^2-1. Plug in x=2 to find slope. use point slope form to get equation! :)
*December 14, 2010*

**Math**

sin^2 theta + 2 cos theta -1/ (sin^2 theta +3 cos theta-3= cos^2 theta+cos theta/ (-sin^2 theta) Prove the identity.
*December 12, 2010*

**chemistry**

Formula for specific heat:q/(m * delta t) Input given data: 35.2 J/(4.0 g * 20 c) Solve: 0.44 J/(g*c)
*December 12, 2010*

**Biology-Respiratory System**

What's the difference between capillaries, pulmonary artery and pulmonary vein?
*December 11, 2010*

**Math**

Prove this identity. State any restrictions on the variables. sin x/(tan x)= cos x
*December 9, 2010*

**Physics**

A satellite has a mass of 101 kg and is located at 1.99x10^6 m above Earth's surface. (a) What is the potential energy of the satellite at this location? (b) What is the magnitude of the gravitational force on the satellite? for potential energy, I was using the equation ...
*December 9, 2010*

**Physics**

A satellite has a mass of 101 kg and is located at 1.99x10^6 m above Earth's surface. (a) What is the potential energy of the satellite at this location? (b) What is the magnitude of the gravitational force on the satellite? for potential energy, I was using the equation ...
*December 9, 2010*

**Math**

Determine whether each general term defines a geometric sequence. Explain. a) f(n)= 2/(3n+1) b) f(n)= 11/(13^n)
*December 7, 2010*

**2nd grade math**

measure the perimeter to the nearest 1/2cm.
*December 7, 2010*

**statistics**

An Urn contains 7 red and 3 white balls. Two balls are drawn in succession without replacement. If the second ball is white, what is the probability that the first ball was white?
*December 7, 2010*

**8th grade**

what i think the legal age 4 drinking should be
*December 7, 2010*

**Algebra 2**

Need help on the #13-20. 13. What is the quotient of d − 2 ) d 4 − 6d 3 + d + 17 __________________ ? A. d 3 − 4d 2 − 8d − 15 R −13 B. d 3 − 8d 2 + 16d − 31 R 79 C. d 3 − 4d 2 + 9d + 35 D. d 3 − 8d 2 + 17d − 17 ...
*December 6, 2010*

**chemistry**

if you combust 30kg of octane (about the amount in one tank for a small car), how many kilograms of CO2 will you emit?
*December 6, 2010*

**chem 2**

What concentration of NaF is required in order to convert a 0.15M HF solution to a buffer with a pH of 5.50?
*December 5, 2010*

**Math**

Given angle theta is bigger than 0 and smaller than 360, determine two possible values of theta where each ration would be true. a) cos theta= 0.6951 b)sin theta= -0.7571
*December 4, 2010*

**Math**

Use the related acute angle to state an equivalent expression: a) tan 110 degrees b)sin 350 degrees
*December 4, 2010*

**Biology**

Explain your liver's role in changing your blood sugar level
*December 3, 2010*

**chemistry**

How much energy (in kilojoules) is needed to heat 5.45g of ice from -12.0 C to 32.0 C? The heat of fusion of water is 6.01kJ/mol, and the molar heat capacity is 36.6 J/(K x mol) for ice and 75.3 J/(k x mol) for liquid water
*December 2, 2010*

**Biology**

What is the lumen of the human digestive system?
*November 30, 2010*

**Physics**

how many sig figs do you use for estimated absolute uncertainties?
*November 29, 2010*

**Math**

Is RESP a form of annuity?
*November 29, 2010*

**physics**

A record player is spinning at 32 rpm when the motor is switched off. After 6.8 seconds the angular speed has decreased to 20 rpm. Calculate the frictional torque if the record player can be treated as a solid wheel of mass 2.4 kg and radius 15 cm. A) 476.47059 Nm B) 0.00499 ...
*November 28, 2010*

**need physics help**

2.1=0(.6)+.5(a)(.6^2) you can get drop the vit since vi=0. that will leave you with 2.1=.5a.6^2 multiply (.5)6^2 then you can divide 2.1 with the answer you got.
*November 28, 2010*

**physics help please**

The tub of a washer goes into its spin-dry cycle, starting from rest and reaching an angular speed of 6.0 rev/s in 12.0 s. At this point the person doing the laundry opens the lid, and a safety switch turns off the washer. The tub slows to rest in 11.0 s. Through how many ...
*November 28, 2010*

**Math**

Thanks!
*November 26, 2010*

**Math**

The hypotenuse of,c of right triangle ABC is 7.0 m long. A trigonometric ratio for angle A is given for four different triangles. Which one of these triangles has the greatest area? Justify your decision. a)sec A=1.7105 b)cos A=0.7512 c) csc A=2.2703 d)sin A= 0.1515
*November 26, 2010*

**Math**

In simple annuities, why is the amount of payment for the first deposit R(1+i)^n-1? Shouldn't it be n?
*November 24, 2010*

**8th grade**

how much water vapor is in 15 C
*November 24, 2010*

**math**

in addition to x=0, x=7 2[2x-7]+11=25 2[2x-7]=14 [2x-7]=7 2x=14 x=7 Check 2[2(7)-7]+11=25 2[7]+11=25 14+11=25 25=25 :D
*November 22, 2010*

**math**

You want to get the absolute value portion of the equation alone first. They you can find what x would equal if it were (2x-7) = blah and if -(2x-7) = blah.
*November 22, 2010*

**Math**

Nevermind, I was able to do it with synthetic division.
*November 22, 2010*

**Math**

How would I find the zeros of the function x^3 -7x +6 ? I know how to do with a x^2 term but, I'm confused as to how to do it when there isn't an x^2.
*November 22, 2010*

**Math**

In a geometric series, t1=12 and S3=372. What is the greatest possible value for t5? Justify your answer.
*November 22, 2010*

**Math**

cent, cent, scent equals 35128; how do you solve it?
*November 21, 2010*

**Math**

The 10th term of an arithmetic series is 34, and the sum of the first 20 terms is 710. Determine the 25th term.
*November 19, 2010*

**Science**

A gas filled balloon having a volume of 3.0 L at 1.1 atmosphere of pressure and a temperature of 22 C is allowed to rise into the stratosphere where the temperature and pressure are: - 28 C (note the negative sign) and 0.002 atmospheres , respectively. What is the approximate ...
*November 19, 2010*

**Calculus**

The volume of a cone of a radius r and height h is given by V=(3.14/3)(r^2)(h). If the radius and the height both increase at a constant rate of .5 cm per second, at what rate, in cubic cm per second, is the volume increasing when the height is 9cm and the radius is 6cm.
*November 18, 2010*

**Science**

Is sugar a covalent or ionic compound?
*November 16, 2010*

**Math**

why do you let n=1, 2 and 3?
*November 15, 2010*

**Math**

How do you get the general term for a sequence that has increasing common differences? For example: 1,2,4,7,11
*November 15, 2010*

**Math**

Thanks!
*November 15, 2010*

**Math**

Determine the 10th term of the sequence 3, 10, 28, 72, 176... State the general term.
*November 15, 2010*

**social studies**

guarentee
*November 14, 2010*

**social studies**

you should always read the ______ before you a buy a product... answer is 9 letters long third letter is an a...
*November 14, 2010*

**social studies**

if you own a factory the factory and any equipment in it are part of your... answer is 7 letters fourth letter is an i... i have been through everything in my study guide and cannot find the answer for this one...
*November 14, 2010*

**1**

omg i absolutely love you bobpursley! thankss for the help as well. =]
*November 13, 2010*

**Accounting**

I have a problem with management accounting However, I have trouble posting the question here Is it possible that i can send it to someone for their assistance
*November 13, 2010*

**Math(geometric sequences)**

sorry i meant 4
*November 13, 2010*

**Math(geometric sequences)**

sorry i subbed 10 into it, and it was wrong.
*November 13, 2010*

**Math(geometric sequences)**

A certain antibiotic reduces the number of bacteria in your body by 10% each does. a)If four does of the antibiotic are taken, what percent of the original bacterial population is left? I think the formula is supposed to be tn=100(9/10)^-1, but when i substituted 1 into it, ...
*November 13, 2010*

**5th grade science/ colloids**

what are some examples of colloids? like a mixture,compound or sometin.... im looking for something like a colloid is water and oil mixed together and so on. thx :)
*November 9, 2010*

**1st grade**

In the past, Lucy was a great singer.
*November 8, 2010*

**chemistry **

Light with a wavelength of 405 nm fell on a strontium surface, and electrons were ejected. If the speed of an ejected electron is 3.49 105 m/s, what energy was expended in removing the electron from the metal? Express the answer in joules (per electron) and in kilojoules per ...
*November 7, 2010*

**chemistry **

Calculate the shortest wavelength of visible light (in nanometers) seen in the spectrum of the hydrogen atom. nm What are the principle quantum numbers for the levels in this transition?
*November 7, 2010*

**chemistry **

What is the wavelength of the transition from n = 2 to n = 1 for Li2+? Li2+ is a hydrogen-like ion. Such an ion has a nucleus of charge +Ze and a single electron outside this nucleus. The energy levels of the ion are -Z2RH/n2, where Z is the atomic number. nm In what region of...
*November 7, 2010*

**chemistry **

What is the de Broglie wavelength of an oxygen molecule, O2, traveling at 503 m/s?
*November 7, 2010*

**chemistry **

Calculate the frequency of electromagnetic radiation emitted by the hydrogen atom in the electron transition from n = 7 to n = 6.
*November 7, 2010*

**math **

jasmine is helping her father plant trees to create a border around their back yard jasmine plants a treesevery 25 and her father plants a tree every 15 minutes if they started together how long before they would finsh planting a treee at the same time
*November 7, 2010*

**math **

slove the folowing eqaution negtive 23=x+35
*November 7, 2010*

**geometry**

the quadrilateral has a pweimeter of 60 meters. mp and no are congruent the length of mn is 10 meters and the length of no is 15 meters what is the length of po
*November 7, 2010*

**analytical chemistry**

blank is used to dissipate the error brought about by impurities. What is the other reason of using blank in Mohr method?
*November 5, 2010*

**English**

I have a few question on linking verbs: 1. I am fond of both kinds of comics. linking verb - fond? 2. Joseph Pulitzer was the first to publish color funnies. linking verb - was? 3. The sales of his newspaper were high. linking verb - sales 4. Sunday Funnies soon became part of...
*November 2, 2010*

**physics**

What is the approximate mass of air in a living room 6.0 m times 3.9 m times 2.7 m?
*November 1, 2010*

**PHYSICS ---HELP!**

Suppose there is a circular metal disk spinning at a constant angular velocity. Now imagine near to, but not in contact with the first disk, there is an identical metal disk spinning at the same angular velocity but in the opposite direction (ie. W1 = -w2) and the surfaces are...
*November 1, 2010*

**Physics-- Please Help!!**

Suppose there is a circular metal disk spinning at a constant angular velocity. Now imagine near to, but not in contact with the first disk, there is an identical metal disk spinning at the same angular velocity but in the opposite direction (ie. W1 = -w2) and the surfaces are...
*November 1, 2010*

**chemistry **

How much heat is released when a mixture containing 12.6 g CS2 and 12.6 g Cl2 reacts by the following equation? CS2(g) + 3 Cl2(g) → S2Cl2(g) + CCl4(g) ΔH° = −230. kJ
*October 31, 2010*

**chemistry **

How many grams of oxygen gas are required to produce 7.46 kJ of heat when hydrogen gas burns at constant pressure to produce gaseous water? 2 H2(g) + O2(g) → 2 H2O(g) ΔH = −484 kJ Liquid water has a heat of vaporization of 44.0 kJ per mole at 25°C.
*October 31, 2010*

**chemistry **

Calculate the heat released when 4.260 L Cl2 with a density of 2.46 g/L at 25°C reacts with an excess of sodium metal to form solid sodium chloride at 25°C.
*October 31, 2010*

**chemistry **

A 19.5-g sample of a metal was heated to 61.67°C. When the metal was placed into 26.5 g of water in a calorimeter, the temperature of the water increased from 25.00°C to 30.00°C. What is the specific heat of the metal?
*October 31, 2010*

**Chemistry **

Hydrogen cyanide is a highly poisonous, volatile liquid. It can be prepared by the following reaction. CH4(g) + NH3(g) → HCN(g) + 3 H2(g) What is the heat of reaction at constant pressure? Use the following thermochemical equations. N2(g) + 3 H2(g) → 2 NH3(g) Δ...
*October 31, 2010*

**Math**

An auditorium has 50 rows of seats. The first row has 20 seats, the second row has 21, the third row has 22 seats, and so on, each row having one more seat than the previous row. How many seats are there all together? a. write 2 different expressions for the total number of ...
*October 29, 2010*

**trig**

If a=8, the angle C=50 degrees and the angle A=35 degrees find the other angle B and the remaining b and c sides. Give your answer to at least 3 decimal places.
*October 29, 2010*

**physics**

Consider a hoola-hoop of radius R and it is spinning about its symmetry axis at a constant angular velocity. Now, I double its mass and halve its angular velocity. What is the new angular momentum in terms of the initial angular momentum?
*October 29, 2010*