Monday

December 5, 2016
Total # Posts: 2,547

**Chemistry help!!!**

The class will react 50.00 mL samples of .200 mol/L potassium phosphate with an excess of 0.120 mol/L lead II nitrate solution. what is the minimum volume of lead II nitrate solution required? What volume of lead II nitrate solution should the instructor tell the students to ...

*April 11, 2012*

**chemistry**

Calculate the pH of the resulting solution if 30.0 mL of 0.300 M HCl(aq) is added to (a) 35.0 mL of 0.300 M NaOH(aq). (b) 40.0 mL of 0.350 M NaOH(aq).

*April 10, 2012*

**Chemistry**

Which of the following solution should be mixed with 50.0 mL of 0.050 M HF solution to make an effective buffer? A) 50.0 mL of 0.10 M NaOH B) 25.0 mL of 0.10 M NaOH C) 50.0 mL of 0.050 M NaOH D) 25.0 mL of 0.050 M NaOH

*April 1, 2012*

**calculus**

if the solutions of f(x)=0 are -1 and 2, then the solutions of f(x/2) = 0 are

*March 31, 2012*

**algebra**

set denominator equal to 0 and solve for x which would make the equation undefined v^2-4v-32=0 (v-8)(v+4)=0 v=8, v=-4 x is not equal to 8 or -4

*March 29, 2012*

**Intermediate Algebra**

=sqrt(24)x i = 2sqrt(6)i

*March 29, 2012*

**Intermediate Algebra**

[(7a-b)(7a+b)]/(7a-b) =7a+b

*March 29, 2012*

**math**

break them down into shapes that you know how to work with like squares and rectangles.

*March 29, 2012*

**Science**

It should be 0.25. I don't really know how to get that from the equation (Amplitude=distance/frequency), but since the problem said that "the crests of the waves are about .5 meters above the troughs." I divided that by two.

*March 22, 2012*

**Genetics**

A certain form of albinism in humans is recessive and autosomal. Assume that 1% of the individuals in a given population are albino. Assuming that the population is in Hardy-Weinberg equilibrium, what percentage of the individuals in this population is expected to be ...

*March 18, 2012*

**Genetics**

The difference between fitness of a given genotype and another genotype considered optimal is called the selection coefficient (s). What is the selection coefficient for a genotype (aa) that produces an average of 99 offspring when Aa individuals produce an average of 100 ...

*March 18, 2012*

**Chemistry**

But how did you get the (Cl^-)?

*March 16, 2012*

**Genetics**

A certain form of albinism in humans is recessive and autosomal. Assume that 1% of the individuals in a given population are albino. Assuming that the population is in Hardy-Weinberg equilibrium, what percentage of the individuals in this population is expected to be ...

*March 15, 2012*

**Genetics**

The difference between fitness of a given genotype and another genotype considered optimal is called the selection coefficient (s). What is the selection coefficient for a genotype (aa) that produces an average of 99 offspring when Aa individuals produce an average of 100 ...

*March 15, 2012*

**Geometry**

The area of a square garden is 242m squared. How long is the diagonal?

*March 14, 2012*

**chemistry**

Its C, 0.004

*March 14, 2012*

**reed**

can you give me a filipino global leaderin the medical field who exemplified his or her faith by creating a difference through an act of social transformation of persons in the family ,in the community and in the global world.?

*March 14, 2012*

**reed**

group of filipinos in the medical field who exemplified his or her faith by creating a difference through an act of social transformation of persons in the family ,in the community and in the global world.

*March 14, 2012*

**pharcalc**

Can you give me one problem about pediatric dosing with many questions.

*March 13, 2012*

**calc2**

Let R denote the region in the plane consisting of all points (x,y) where x ≥ 1 and 0 ≤ y ≤ 2/x. Let S denote the solid formed by rotating R about the x-axis. Observe that S is an unbounded region; that is, it extends indefinitely in the direction of the ...

*March 8, 2012*

**Calculus**

The graph of the curve y2=10 x+10 is a parabola, symmetric with respect to the x-axis. Find the area of the surface generated by rotating about the x-axis the part of this curve corresponding to 0 ≤ x ≤ 20.

*March 8, 2012*

**Math**

Because diameter is twice the radius, the radius must be 1/2 of 8 ft. So r=4ft. The circumference is equal to 2*pi*radius. Since pi is =3.14 Thus by comparing the two equations D=2r C=2rpi the only difference is pi so the answer would be F if you assume 3.14 is approximately 3

*March 8, 2012*

**Science**

Roots have a tendency to grow downwards, while shoots grow upwards. Gravitropism is a turning or growth movement by a plant or fungus in response to gravity. Charles Darwin was one of the first to scientifically document that roots show positive gravitropism and stems show ...

*March 8, 2012*

**ymous**

You're standing 14 feet from the edge of a cylindrical water tank and is 26 feet from the point of tangency. the tank is 10 feet tall. what is the volume in cubic feet

*March 8, 2012*

**business**

•400, who posted on Sunday, April 15, 2012 at 1:51pm was correct!

*March 7, 2012*

**Physics 12**

A block mass m1 lying on a frictionless inclined plane is connected to a mass m2 by a massless cord passing over a pulley. 1.) determine a formula for the acceleration of the system in terms of m1, m2, Ө, and g. 2.)what conditions apply to mass m1 and m2 for the ...

*February 26, 2012*

**Math**

how do you factor: 3x^2 + 11x - 4

*February 25, 2012*

**life orientation**

Could you be more specific with the question? What are you referring to?

*February 23, 2012*

**any tutor**

Are there any tutors on right now or people who are good with chemisty?

*February 23, 2012*

**CHEMISTRY **

Give names of the following covalent (nonmetallic) compounds: S4N2 ClF3 I2O5 SeF6 PBr5 H2O C2I6 C5F9H2Cl Si2F6 Si9F10Br7H

*February 23, 2012*

**social studies**

Pharaohs from Kush ruled Egypt for almost a century. The rulers from the south encouraged an Egyptian-style culture. They built temples to honor Nubian and Egyptian gods. They dotted the desert with hundreds of tombs. Like earlier pharaohs, they encouraged trade between Africa...

*February 23, 2012*

**7th grade science**

You're welcome. (:

*February 23, 2012*

**math**

determine the linear velocity of a point rotating at 15 revolutions per minute at a distance of 3.04 meters from the center of a rotating object

*February 19, 2012*

**physics**

The racing car has a mass of 1250kg. When the brake pedal is pushed down a constant braking force of 10,000 N is exerted on the car. Calculate the acceleration of the car. If you could also tell me how you came to the answer, it would help me in the future. Thank you.

*February 16, 2012*

**Genetics**

In general, what two methods are used to grow bacteria in the laboratory?

*February 8, 2012*

**Genetics**

Name the term used to describe the phenomenon in which a bacteriophage genome incorporates its genome into the chromosome of the host.

*February 8, 2012*

**physics**

application of and the concept of heat and temperature in technology.please can u give me the link.thanks

*February 8, 2012*

**Algebra**

ONE WAS IRRATIONAL ONE KEPT ON REPEATING HIMSELF ONE WAS UNREAL

*February 5, 2012*

**Russian History xD**

Thank you! :D

*February 1, 2012*

**Russian History xD**

I'm doing a project on Russian art, and I'm kinda confused. These are some things I got down. They're just jumbled thoughts. But did communism ending cause the renaissance? Since Russia was a communist country, art used to be used to make the government look good. ...

*February 1, 2012*

**Russian History**

Did Peter the Great end communism?

*February 1, 2012*

**Physics**

A speeder traveling at a constant speed of 102 km/h races past a billboard. A patrol car pursues from rest with constant acceleration of (9 km/h)/s until it reaches its maximum speed of 146 km/h, which it maintains until it catches up with the speeder. How long does it take ...

*January 28, 2012*

**Physics**

A copper (Cu) weight is placed on top of a 0.24 kg block of wood (density = 0.60*10^3 kg/m3) floating in water. What is the mass of the copper if the top of the wood block is exactly at the water's surface?

*January 24, 2012*

**Precalculus**

The figure below shows a conchoid of Nicomedes. The top part is formed by a ray from the origin that rotates through an angle t° with the x-axis. The ray intersects the fixed line y = 2 at point A. From A you measure out 7 more units to point P on the graph of the conchoid...

*January 20, 2012*

**Precalculus**

Thank you so much!

*January 20, 2012*

**Precalculus**

Given r = 10 cos θ If you sketched an angle of θ = 150 degrees, what quadrant would it be located in? It's either the first or second... I think second? Multiply both sides of r = 10 cos θ by r. Transform the resulting equation into Cartesian coordinates.

*January 20, 2012*

**Precalculus**

Ohmygoodness. Hhaha. Thanks!

*January 20, 2012*

**Precalculus**

This is probably silly, but where is the 2 in the beginning of all of those from?

*January 20, 2012*

**Precalculus**

Write the three cube roots of 8 cis (-30°).

*January 20, 2012*

**Precalculus**

So the answer for "Give the equation of the line in rectangular coordinates." is sqrt(x^2+y^2) = 4 [sqrt(x^2+y^2) ]/y? Or is it the y=4? Again, that's probably a silly question..

*January 20, 2012*

**Precalculus**

The polar equation of a graph is given below: r=4/sin(theta) Give the equation of the line in rectangular coordinates. If you rotate this graph 40 degrees counterclockwise about the pole, would you add or subtract 40 degrees to θ? Subtract?

*January 20, 2012*

**Precalc**

*(x + 5)(x^2 - 6x + 13)

*January 20, 2012*

**Precalc**

Given g(x) = (x + 5)(x2 - 6x + 13), find the one real zero of g(x): I think it's -5 Find the two complex zeros of g(x):

*January 20, 2012*

**Precalculus**

The figure shows part of a curve traced by a point on the circumference of a circle of radius 4 that rotates, without slipping, around a fixed circle of radius 2. The rotating circle starts with angle t = 0 radians and the point P (x, y) at (10, 0). In this problem you will ...

*January 20, 2012*

**Precalculus**

This figure shows concentric circles of radii 3 and 5, respectively, centered at the origin of an xy-coordinate system. A ray from the center at an angle of t degrees to the x-axis cuts the two circles at points A and B. From A, a vertical line is drawn; and from B, a ...

*January 20, 2012*

**Precalculus**

QUESTION 1 Joe intercepts a pass 8 yards into the end zone, 19 yards from the right side of the field as he faces the opposite end of the field (see figure). He starts running diagonally, moving at a rate of 4 yd/s down the field and 2 yd/s across the field. Let x and y be his...

*January 20, 2012*

**Precalculus**

I don't even how to go about this.... Mars is in an elliptical orbit with the Sun at one focus, as shown in the figure. At its aphelion, Mars is 156 million miles from the Sun. At its perihelion, Mars in only 128 million miles from the Sun. How long is the major axis of ...

*January 20, 2012*

**Precalculus**

A geometric series has t1 = 100 and t2 = 90. Find the number to which Sn converges as n gets very large.

*January 20, 2012*

**Precalculus**

Thanks!

*January 20, 2012*

**Precalculus**

A geometric series has t1 = 3 and r = 2. If tn = 96. What does n equal in this problem? What is the special name given to the terms between 3 and 96 in this problem?

*January 20, 2012*

**Precalc**

(10 cis 200) (2 cis 50) = ? Is it just 20cis(10000)?

*January 20, 2012*

**math problem**

No. 6(-4)-5(7)=-35, not -2.

*January 20, 2012*

**Language**

The other is bad hair (hare) day. Too funny.

*January 20, 2012*

**Language**

The main (mane) part. Clever.

*January 20, 2012*

**Language**

Toed (Toad) is the first.

*January 20, 2012*

**science**

Arranging species into classes.

*January 19, 2012*

**counciling**

Maybe about what you learned from one of the sadder times in your life?

*January 19, 2012*

**counciling**

Neither, just honest.

*January 19, 2012*

**physics**

While John is traveling along an interstate highway, he notices a 166 mi marker as he passes through town. Later John passes a 120 mi marker. What is John’s current position?

*January 16, 2012*

**physics**

A jet travels at 434 m/s. How long does it take to travel 294 m? Answer in units of s

*January 16, 2012*

**physics**

While John is traveling along an interstate highway, he notices a 166 mi marker as he passes through town. Later John passes a 120 mi marker. What is the distance between town and John’s current location? Answer in units of mi

*January 16, 2012*

**physics**

A sound wave, traveling at 348m/s, is emitted by the foghorn of a tugboat. An echo is heard 1.99 s later. How far away is the reflecting object? Answer in units of m

*January 16, 2012*

**Physics**

Please show steps and thank you! An astronaut of mass 70 kg carries an empty oxygen tank of mass 14 kg. He throws the tank away from himself with a speed of 3 m/s. With what velocity does the astronaut start to move through space?

*January 14, 2012*

**Physics **

PLEASE HELP! and include steps of how you solved it! What magnitude of force, acting for 0.025 s, will change the velocity of a 100 g ball from 30 m/s eastward to 40 m/s westward?

*January 14, 2012*

**Chemistry**

How many Calories of energy does it take to heat 257 mL of water by 62.2 C?

*January 10, 2012*

**Math**

(2^n) - 1

*January 10, 2012*

**Precalculus**

Is this correct? 1. Find the solution set for x^2/(x+3) < 9/(x+3). x^2/(x+3) < 9/(x+3) x^2 < 9 x^2 - 9 < 0 (x-3)(x+3)<0

*January 10, 2012*

**socials**

You've neglected to mention economy. Although it is horrid and quite unfortunate, it is a way to regulate population. As prices go up, an increasing number of individuals fail to meet the costs of standards to living. These people can sometimes die from hunger, refrain ...

*January 10, 2012*

**Physics**

What magnitude of force, acting for 0.025 s, will change the velocity of a 100 g ball from 30 m/s eastward to 40 m/s westward?

*January 8, 2012*

**PHYSICS 11th**

A girl holds a 1.7 kg air rifle loosely and fires a bullet of mass 2 g. The muzzle velocity of the bullet is 160 m/s. What is the magnitude of the recoil velocity of the gun?

*January 6, 2012*

**PHYSICS**

A 62 kg water skier, moving at 14 m/s , lets go of the towline. Momentum= 868 kgm/s Impulse= -868 Ns c.If the water exerts an average force of -275 N on the skier, how long must the force act? 3.16 s d. How far does she travel during this time? I'm guessing "this time...

*January 6, 2012*

**Physics**

i hate vasts

*December 28, 2011*

**precalulus**

Ok feeling kinda dumb because this isn't coming out right. I know it's simple. log6 (x -3) + log6(x -6) - log6(x + 1) = 2

*December 21, 2011*

**algebra**

given f(x) and g(x) find a. f + g b. f -g c. f*g d. f/g f(x) = sqrt x g(x) = 6x - 5

*December 21, 2011*

**pre calculus**

given the following rational function a. state the domain b. find the vertical and horizontal asymptotes if any c. find the oblique asymptote f(x) = x^2 + 7x + 5 / x + 8

*December 21, 2011*

**pre calculus**

verify functions f and g are inverses of each other by showing that f(g(x)) = x and g(f(x)) = x. f(x)= 5/(2 -x) g (x) = 2 - 5/x

*December 21, 2011*

**algebra**

Thank you!

*December 20, 2011*

**algebra**

solve the inequality express in interval notation x^4 + 4x^3 - 9x^2 - 36x < 0

*December 20, 2011*

**pre calculus**

Thank u!

*December 20, 2011*

**pre calculus**

Solve the exponential equation Express you solutions in exact form only Please show your work e^2x - 9e^x - 20 = 2

*December 20, 2011*

**algebra**

solve the exponential equation Express in exact form. 5e^xlog_9 = 11 Is x = (ln11-ln5/log_9 exact form??????

*December 18, 2011*

**algebra**

solve the logarithm log_2 (x -1)- log_2(5x +1) = -3 I got -3, is this correct???????

*December 18, 2011*

**algebra**

You make it look so easy and I have been pounding my head on the wall. Thank you!

*December 17, 2011*

**algebra**

Solve the equation below. Please show all of your work log_7(x + 3/7) = -2

*December 17, 2011*

**precalulus**

Change the exponentional expression to an equivalent expression involving a logarithm. 7^c = 0.026

*December 17, 2011*

**pre calculus**

It's ok figured that out on my own :)

*December 17, 2011*

**pre calculus**

graph the function below. Determine the domain, range and horizontal asymptote. f(x) = -(3/4)^x - 1

*December 17, 2011*

**critical thinking ( is it correct)**

It’s a deductive argument. Because all its premises are true (Many universities have begun using I<Clicker 2 to capture student response information in the classroom, and 94% of users agree that the product is effective or extremely effective) then its conclusion must ...

*December 16, 2011*

**pre calculus**

Can someone please help me with this???????

*December 15, 2011*