Friday

July 3, 2015

July 3, 2015

Total # Posts: 998

**Juvenile Delinquency**

Do people really change or do they stay the same but appear to be different because their life circumstances have changed?
*July 7, 2011*

**economics- free trade.**

What are the advantages and disadvantages of free trade?
*July 5, 2011*

**Algebra**

In a paragraph, describe how to simplify this expression ã100
*June 15, 2011*

**Physics**

A golf ball is given an initial speed of 20 m/s and returns to ground level. Which launch angle above level ground results in the ball traveling the greatest horizontal distance? Neglect friction. 1. 60 degrees 2. 45 3. 30 4. 15 The answer is 45 but I was wondering how to get ...
*June 15, 2011*

**Physics**

Also: Given that A+B+C=0, find the magnitudes of A and B.
*June 12, 2011*

**Physics**

Vector A points in the negative direction. Vector B points at an angle of 35.0 above the positive x axis. Vector has a magnitude of 10 and points in a direction 46.0 below the positive x axis.
*June 12, 2011*

**Algebra please help**

f(x)=1/3(x+7)^2+4 find the vertex,the line of symmetry, and the max or min. value of the f(x) graph the function. thank you in advance :)
*June 8, 2011*

**world geography**

What are the "many islands" people also called?
*June 5, 2011*

**probability and statistics I NEED HELP**

A six-sided die is rolled 20 times and a 5 is rolled 9 times. a) State a null and alternative hypothesis for the die being fair. b) Can the null hypothesis be rejected at the .01 significance level?
*May 31, 2011*

**Algebra**

w^4-6w^2-2=0 what is the solution?
*May 24, 2011*

**Algebra**

-7 and -4 the quadratic equation is? Thank you in advance :)
*May 24, 2011*

**Chemistry (PLEASE HELP)**

thanks, now do u know the units to this problem
*May 23, 2011*

**Chemistry (PLEASE HELP)**

How much energy (in joules) is contained in one mole of photons (electromagnetic quanta) of frequency 2.3E+19 Hz?
*May 23, 2011*

**algebra**

Write an algebraic expression for the following: If James spends 5/6 of his weekly allowance (x) on a movie, how much will James have left?
*May 23, 2011*

**Criminal justice**

why does the system require that everyone is entitled to a fair trail, even if the person is caught red-handed
*May 22, 2011*

**Chemistry-Help Please!**

@ 20 Celsius - 22g CuSO4 / 100g H2O @ 40 Celsius- 42g CuSO4 / 100g H2O Using this, answer whether these are saturated or unsaturated @ 40 Celsius is 5g CuSO4 / 10g H2O @ 40 Celsius is 99g CuSO4 / 250g H2) I was told that the first one is unsaturated and the second one is ...
*May 19, 2011*

**Chemistry**

Can anyone tell me if I am right on these? Calculate the amount of solute needed to make each of the solutions 225g of 10% (m/m) K2CO3 solution Answer: 22.5g K2CO3 0.50kg of 18% (m/m) KOH solution Answer: 90g KOH
*May 19, 2011*

**Chemistry**

@ 20 Celsius - 22g CuSO4 / 100g H2O @ 40 Celsius- 42g CuSO4 / 100g H2O Using this, answer whether these are saturated or unsaturated @ 40 Celsius is 5g CuSO4 / 10g H2O @ 40 Celsius is 99g CuSO4 / 250g H2) I was told that the first one is unsaturated and the second one is ...
*May 19, 2011*

**math**

i mean the balance after the interest is added is $960. how do i figure out the principle and the interest? The rate is 4% and the time is 5 years. Thanks!
*May 16, 2011*

**math**

No the balance not the principle. The principle and the interest are the two amounts we don't know. I know if you add the two together you get $960 but I can't figure out to get those two numbers.
*May 16, 2011*

**math**

it is a simple interest problem: the balance is $960, the rate is 4% and the length is 5 years -- what is the interest?
*May 16, 2011*

**CRT 205**

The following activity helps you sharpen your skills in recognizing deceptive reasoning. The statements below are derived from the viewpoints in this chapter. Beside each one, mark the letter of the type of deceptive appeal being used. More than one type of tactic may be ...
*May 15, 2011*

**thank you mathmate **

Thank you for your help
*May 14, 2011*

**Algebra**

what is the square root of 12x^3y^2
*May 14, 2011*

**vocab**

poverty, paintings, interests
*May 9, 2011*

**Chemistry**

This should be saturated When you divide 22g CuSO4 per 100 g H20 by 4. You get 5.5g of CuSO4 per 25g H2O. Does this help?
*May 4, 2011*

**chappell**

what is the lattice method for 2 times 46
*May 2, 2011*

**algebra **

a jeweler purchased 5 oz of a gold alloy and 20 oz of a silver alloy for a total cost of $540. The next day at the same price per ounce, the jeweler purchased 4 oz of th egold alloy and 25 oz of the silver alloy for a total cost of $450. Find the cost per ounce of the gold and...
*April 29, 2011*

**Chemistry**

I got 3.39%, correct? Thanks
*April 29, 2011*

**Chemistry**

A lab assistant prepared a potassium chloride solution for her class by dissolving 5.34 g of KCl in 152g of water. What is the mass percent of the solution she prepared? Could you help me set this up/show me how to do this problem?
*April 29, 2011*

**Probability**

Factories A and B produce computers. Factory A produces 2 times as many computers as factory B. The probability that an item produced by factory A is defective is 0.012 and the probability that an item produced by factory B is defective is 0.04. A computer is selected at ...
*April 26, 2011*

**Math**

If a pro basketball player has a vertical leap of about 35 inches, what is his hang time? Use the hang-time function V = 48T²
*April 24, 2011*

**Chemistry**

Of helium and argon, which will have the higher boiling point and why?
*April 20, 2011*

**Spanish**

A mis amigas no ___ comer papas fritas.
*April 18, 2011*

**english - text commentary "Painful case" **

Hello, I'm french student and I must to make a text commentary and I need your help finding some idea to develop. It's an extract from "Painful case" by James Joyce Thank you! When he gained the crest of the Magazine Hill he halted and looked along the river ...
*April 12, 2011*

**social studies**

What are the pros and cons of textbook social studies learning?
*April 10, 2011*

**physics**

just kidding i figured it out.
*April 7, 2011*

**physics**

A beam of light is incident from air on the surface of a liquid. If the angle of incidence is 25.0° and the angle of refraction is 14.0°, find the critical angle for the liquid when surrounded by air. im not sure how to start this problem.
*April 7, 2011*

**physics**

A convex mirror has a focal length of 19.0 cm. Determine the object location for which the image will be one-fourth as tall as the object. i really need help on this one. im completely stuck!
*April 6, 2011*

**physics**

A convex mirror has a focal length of 19.0 cm. Determine the object location for which the image will be one-fourth as tall as the object. i know that 1/f=1/do=1/di. when i put the numbers into the equation i keep getting 23.75 and its saying that its wrong. can you please ...
*April 6, 2011*

**social studies**

What are the pros and cons of textbook social studies learning?
*April 5, 2011*

**statistics**

Start with x = 100 and add four x values to make a sample of five data such that: a. s = 0 b. 0 < s < 1 c. 5 < s < 10 d. 20 < s < 30
*April 5, 2011*

**Calculus**

Find the area of the region enclosed by the inner loop of the curve. r = 5 + 10sin(θ) Any help would be greatly appreciated!!!
*April 4, 2011*

**Calculus II**

Find the area of the region enclosed by the inner loop of the curve. r = 5 + 10sin(θ) Thanks for the help!
*April 3, 2011*

**math**

12x^4 _______ 42x
*March 30, 2011*

**Algebra**

Choose the correct simplification of (3xy6)2(y3)3.
*March 20, 2011*

**physics**

A small motor draws a current of 1.76 A from a 110 V line. The output power of the motor is 0.20 hp. (a) At a rate of $0.060/kWh, what is the cost, in cents, of operating the motor for 4.0 h? (b) What is the efficiency of the motor? for (a) i am doing IV*hours*price and its ...
*March 14, 2011*

**math**

Turn 7 21 into a percent and decimal. First simplify the fraction. Show your answer on the number line.
*March 9, 2011*

**4th grade math**

Aaron's family is driving 80 miles to the mountains. They have already traveled 30 miles. They are traveling at a speed of 50 miles per hour. How many hours will it take them to complete the trip?
*March 7, 2011*

**calculas**

how long will it take an ice cube to melt completely? You left out an ice cube ant 1/4 of it melts in 1 hour. Use the following steps to find out how long it will take before it is melted completely. 1-let s represent the side length of the ice cube, and observe that s is a ...
*March 6, 2011*

**algebra**

3 index square root 81 I got the answer 3 3index square root 3 is this correct?
*February 28, 2011*

**Algebra**

square root xyz cubed.
*February 28, 2011*

**math**

Solve for x: log3(x^2-4)-log3(x+2)=2
*February 27, 2011*

**Math**

A room is in the shape of a right triangle. The hypotenuse is 8 meters longer than the short leg and the long leg is 4 meters longer than the short leg. Find the length of each side. (ok, now how can it be done if I change each side to cm and km, then ft and yards?)
*February 21, 2011*

**business statistics**

The scores on a standardized exam are normally distributed with mean= 50 and variance=16. (a) what percentage of the scores exceed 58? (b) what percentage of the scores lie between 38 and 54? (c) what is the 84th percentile of the distribution?
*February 20, 2011*

**algebra**

(x+3)/(x^2-x-12) + (2/x + 3)= (1)/(x-4)
*February 20, 2011*

**algebra**

(x+3)/(x^2-x-12) + (2/x + 3)= (1)/(x-4)
*February 20, 2011*

**algebra**

(x+3)/(x^2-x-12) + (2/x + 3)= (1)/(x-4)
*February 20, 2011*

**algebra**

Factor the Following: 3x^2 + 10xy + 7y^2
*February 20, 2011*

**algebra**

This is how the problem looks: (x+3)/(x^2-x-12) + (2/x + 3)= (1)/(x-4)
*February 19, 2011*

**algebra**

x+3/x^-x-12 + 2/x+3 = 1/x-4
*February 19, 2011*

**algebra**

2/5 - 1/3 Top of complex fraction 2/3 - 3/4 Bottom of complex fraction
*February 19, 2011*

**algebra**

whoops x+6/27 = 1/x
*February 19, 2011*

**algebra**

x=6/27 = 1/x
*February 19, 2011*

**Algebra**

8x^3 + 1728
*February 19, 2011*

**Algebra**

-11^-3
*February 19, 2011*

**Algebra**

(4y^2)^5 __________ y ^-3
*February 19, 2011*

**algebra**

Find the equation of the line that passes through the points ( 8, - 15 )and(-2,5). write the equation in y=mx = b form.
*February 19, 2011*

**algebra**

Solve: x-2y= -5 2x+y= -5
*February 19, 2011*

**Algebra**

The resistance in an electric circuit varies inversely with the current. If the resistance is 12 ohms when the current is 4 amps, what is the resistance when the current is 8 amps.?
*February 19, 2011*

**Algebra**

3 is supposed to be the denominator of 2 6 is supposed to be the denominator of 5
*February 19, 2011*

**Algebra**

Complex Fractions _1_ - _2_ x^2 3 ____________ _1_ - _5_ x 6
*February 19, 2011*

**Algebra**

_x+6___ = _1_ 27 x is this where I cross multiply?
*February 19, 2011*

**algebra**

_2__ = ____2___ x-9 x^2-6x-27 Solve the equations Check solutions to the equations (plug the answer back into the original equation.)
*February 19, 2011*

**Algebra**

Help me factor this it's so easy I am not getting it figured out! 8x^2-16xy+8y^2
*February 18, 2011*

**math**

what is the difference between odds and probability?
*February 15, 2011*

**Chemistry**

I need to find out what the total acid concentration is in Kool-Aid. If 23.3 mL of 0.1043M NaOH neutralize a 60 mL solution of Kool-Aid (10 mL) and water (50 mL), what is the total concentration in a 10.00 mL aliquot of Kool-Aid? If you prepared a standard 250 mL serving by ...
*February 15, 2011*

**Science**

How might pollen be carried from the anther to the female part of the flower?
*February 14, 2011*

**Chemistry AP**

What is the mass of oxygen in a ml flask if the pressure is 1.00 atm and a temperature of 22.0 Celsius?
*February 7, 2011*

**math**

the needle of the scale in bulk food section of a supermarket is 25 cm long. find the distance when the needle rotates 50 degrees
*February 6, 2011*

**physics**

Two speakers are driven by a common oscillator at 870 Hz and face each other at a distance of 1.20 m. Locate the points along a line joining the two speakers where relative minima of pressure amplitude would be expected. (Use v = 343 m/s. Choose one speaker as the origin and ...
*January 31, 2011*

**physics help please**

Two speakers are driven by a common oscillator at 870 Hz and face each other at a distance of 1.20 m. Locate the points along a line joining the two speakers where relative minima of pressure amplitude would be expected. (Use v = 343 m/s. Choose one speaker as the origin and ...
*January 31, 2011*

**algebra**

Please help me write the polynomial by multiplying the factors together? (x+5)(x-4)^2
*January 28, 2011*

**physics help pleased**

Two trains on separate tracks move toward one another. Train 1 has a speed of 125 km/h and train 2 a speed of 100.0 km/h. Train 2 blows its horn, emitting a frequency of 500 Hz. What is the frequency heard by the engineer on train 1? (Assume the speed of sound is 345 m/s.)
*January 28, 2011*

**physics**

A commuter train passes a passenger platform at a constant speed of 40.0 m/s. The train horn is sounded at its characteristic frequency of 320 Hz. What overall change in frequency is detected by a person on the platform as the train moves from approaching to receding?
*January 28, 2011*

**algebra**

what is the percent of change from $48.50 to $38.80
*January 26, 2011*

**Math**

(5x + 10)(5x - 5)
*January 17, 2011*

**Math**

The area of a square field is represented by the trinomial x^2-10x+25. Write an expression that would represent the perimeter of the field.
*January 17, 2011*

**Math**

Find the area of a rectangle if its length is 5x+10 and its width is 5x-5
*January 17, 2011*

**Math**

(numeratorx^-4y^2/Denominator x^-2y^-4)-3
*January 17, 2011*

**Math**

lol omg I can't believe I missed that one!
*January 17, 2011*

**Math**

(abc)^0
*January 17, 2011*

**Math**

does the ^ mean squared? and there were No parentheses
*January 17, 2011*

**Math**

I had to simplify the expression: -5exponent2(squared) I got the answer of 25 wrong. Why is that wrong?
*January 17, 2011*

**engineering **

If a source is emitting particles at a rate of 15,000 particles per second, what is the flux at 30 cm away from the source?
*January 13, 2011*

**half life**

If the radiological half life of a material is 31 minutes, and you have 77 grams now, how much did you have 55 minutes ago?
*January 13, 2011*

**physics**

A 215 g mass is attached to a spring and executes simple harmonic motion with a period of 0.250 s. If the total energy of the system is 2.30 J. (a) Find the force constant of the spring. 135.81 N/m (b) Find the amplitude of the motion. i just need help with what equation i ...
*January 12, 2011*

**physics**

A 0.44 kg object connected to a light spring with a spring constant of 22.0 N/m oscillates on a frictionless horizontal surface. The spring is compressed 4.0 cm and released from rest. (a) Determine the maximum speed of the mass. 28.28 cm/s (b) Determine the speed of the mass ...
*January 11, 2011*

**physics**

figured it out
*January 11, 2011*

**physics**

A child's toy consists of a piece of plastic attached to a spring. The spring is compressed against the floor a distance of 2.00 cm, and the toy is released. If the toy has a mass of 105 g and rises to a maximum height of 75.0 cm, estimate the force constant of the spring.
*January 11, 2011*