Wednesday
April 23, 2014

Posts by anna


Total # Posts: 1,883

Algebra
I have two short questions which I think I know the answer-could you please check? If I write log(b)x - 2log(b)y as a single logarithm it would be log(b) x/y^2, correct? If not please help and Is the function f(x) = 1/x a exponential function -I think it would be because it co...

Algebra-Reiny please explain this
Reiny, thank you-I get it now thanks again

Algebra-Reiny please explain this
Hi Reiny, I posted this problem earlier and you responded but I don't get the reasoning- The problem was -2log8(x+1) = -8 you said multiply by -2 and then you put log8(x+1)=4(wasn't that dividing by -2) log8(x+1)^2 = 8 (how did you get to the power of 2 and =4 became =...

Algebra-Could Mathmate or Reiny or Dr. Bob look at this if you have time
Please give me some direction for the above problem Thank you

Algebra
How do I start to solve -2log8(x+1) = -8? I think -2log8(x+1) is log8^(x+1)to the 2nd but then what do I do because then I think I should do log-8/log8 = x+1)^2 but that doesn't work at all Thank you for any help you can give

10th grade
Suppose that a kid was casually sledding down a gentle slopping hill going 6 feet per second. Then, he hit a steeper part of the hill and started accelerating at a rate of 1.2 feet/second squared. At the bottom of the steep part of the hill he was going 10.56 feet/second. How ...

Calculus
that weird 'e' symbol is supposed to be a theta sign

Calculus
A line through the origin, rotates around the origin in such a way that the angle, ¦È, between the line and the positive x-axis changes at the rate of d¦È/dt for time t¡Ý0. Which expression gives the rate at which the slope of the line ...

Calculus
If y=xln(x)^2 , then dy/dx=

Calculus
If f(x)= sqrt(4sin(x)+2), then f'(0)=

physics
A plane designed for vertical takeoff has a mass of 51 kg. Find the net work Wnet as it accelerates upward at 1 m/s2 through a distance of 34 m after starting from rest.

Calculus
A rectangle is insribed between the parabolas y=4(x^2) and y=30-x^2. What is the maximum area of the rectangle? Domain: [-3,3] Range:[-2, 40] THANK YOU!

Math question
I don't either I got 62.8

Calculus
A particle is moving around the unit circle (the circle of radius 1 centered at the origin). At the point (.6 , .8), the particle has horizontal velocity dx/dt=3. What is its vertical velocity dy/dt at that point? I don't know what equation to use or anything for this prob...

Calculus
If the volume of a cube is increasing at 24 in^3/min and the surface area of the cube is increasing at 12 in^2/min, what is the length of each edge of the cube? I know that dV/dt=24 and ds/ds=12. I also know that Volume=s^3 and Surface Area=6*s^2, but what do I do from there?

Calculus
What is the linearization of f(x)=e^x at x=1?

statistics
Hello. I recently had this question on my Midterm "Suppose the number of students coming to Thomas’s Monday office hours follows a Poisson distribution with mean 5. Further suppose that 30% of these students wear glasses. What is the probability that for the next Mon...

Anatomy
The gland that helps regulate the endocrine system by secreting stimulating hormones is the____. Thanks for helping!

Spanish
Thank you

Spanish
Voy a la piscina means I'm going to the pool, correct? Would I say I'm going to the mail as Voy al correo. How do I say I need to send a card? Thank you

physics
A stone is thrown vertically upward. On its way up it passes point A with speed v, and point B, 6.2 m higher than A, with speed v/2. Calculate the maximum height reached by the stone above point B.

Physics
A colony of troglodytes has been in a lengthy feud with its neighbors on the adjacent cliff. Colony A finally develops an important military breakthrough: it rolls bombs off its cliff at known rates of speed, thus gaining pinpoint accuracy in its attacks. The acceleration of g...

Physics
A plane drops a hamper of medical supplies from a height of 3410 m during a practice run over the ocean. The plane's horizontal velocity was 121 m/s at the instant the hamper was dropped. What is the magnitude of the overall velocity of the hamper at the instant it strikes...

math
Your brother traveled 117 miles in 2.25 hours to come home for Christmas. What's the average speed that he was traveling?

Spanish
How would I say "He looks at art." Thank you

chemistry
Which of the following acids has the weakest conjugate base? a....4.2E-09 b...9.2E-03 c....6.3E-06 d....1.2E-01

chemistry
what is teh equilibrium concentration of acetate ion if the equilibrium concentration of acetic acid is .40 M, the pH is 3.85, and Ka is 1.8E-05?

chemistry
which of the following salts do you expect to have the lowest water solubility? a...SrF2 b...Rb2O c...Ga2O3 d...CsNO3 All the numbers are subscripts

chemistry
to find the molarity of an aqueous solution of an ionic solid what do you need to know? a... mass of solid, formula of solid, volume of water b...moles of solid, formula of solid, volume of water c....mass of solid, formula of solid, volume of solution d....moles of solid, for...

chemistry
is a negative Kc possible. Also, is a negative Ka possible?

chemistry
what is the pH of an .200 M aqueous solution of NaOH?

Chemistry
Umm, I don't understand, how do I found out what the limiting reagent is?

Chemistry
8.40 grams of Hydrogen gas reacts with 48.2 grams of Oxygen gas. Give the mass of the water vapor produced and the mass of the excess reactant left over. Can somebody please explain stoichiometry to me? I've failed the test and the retest. I'm usually able to balance t...

History
How did the shortage of good farmland contribute to the desire for federal union (Confederation)

History
What areas of British North America seemed most vulnerable to American expansion? How did the shortage of good farmland contribute to the desire for federal union (Confederation?)

helping abused children
what is the best statement about children who are abused

physics
thank you!

physics
Two masses are connected by a string. Mass A is on a flat roof and mass B is hanging over the edge of the roof. The mass on the roof is 15 kg and the hanging mass is 5 kg. The edge of the roof is 100 m above the ground. The two masses are initially at rest with the hanging mas...

math cal
A plane flying horizontally at an altitude of 3 mi and a speed of 480 mi/h passes directly over a radar station. Find the rate at which the distance from the plane to the station is increasing when it is 6 mi away from the station. (Round to the nearest whole number.)

physics
if you were stationary in space at the same distance from the sun as the eath is, how much force would the sun be exerting on you? what would be your acceleration towrd the sun? what would be the sun's acceleration toward you? okay so im a little confused where to go with ...

chemistry
If I make an ice pack with 750 mL of water, what mass of ammonium chloride must I include to get the temperature to drop from 20 degrees celsius to 5 degrees celsius. The heat of solution of the water and ammonium chloride is 14.8 kJ/mole.

Chemistry
Calculate the velocities of electrons with de Broglie wavelengths of 1.7 102 nm and 5.0 nm, respectively.

chemistry
i think its fluorine but im not sure if its right but i do believe that it is not right

chemistry
Which halogen can form only one oxidation state other than zero?

science/math
One multicellular organism is a cube. Each of its sides is 3cm long. Each of its cells is 1cm to the third power.How many cells does it have? If each side doubles in length,how many cells will it then have?

com156
• Write two paragraphs explaining the changes that you would make to revise the paper. The minimum word count for these two paragraphs is 400 words.

Physics
a. you do v^2 = vi^2 = 2aD then u do V= vi + at to get time as 20.3 b. D= Vox*T (415.7)(20.3) = 8440m c.430m/s at 14.8* downward

Physics
a rifle is fried from the top of a building 220 meters high with an initial velocity of 425 m/s at an angle of 12.0 degrees above the horizontal. a. how long will it take for the bullet to reach the ground? b. how far from the base of the building will the bullet strike the gr...

cal
never mind i think i got the answer..thanks any way:)

cal
((4)/(3)x)*(sqrt(3-x)) i'm not sure how to find the derivative I know that I have to use chain rule so would it be 4/3(sqrt(3-x)+((4/3)x)((1/(3-x)^-.5) If this is right can someone help me simplify it

math
solve for x 2(e^-7x)=5

English
What are some differences between Beowulf and Wanderer?

English
Is there any basic format for a graphic organizer?

english
I really don't understand how to scan a poem for iambic pentameter. Help!!

english
does this sentence make sense? They’re excited about the spring fling Hannah replies, as she her cheeks stain scarlet.

english
I need to contrast and compare Beowulf's speech (lines 365-428) with Gaiwain's speech (lines 343-361)

12th grade
I am assuming you are talking about committees... Committees examine each bill and combine like bills to create a final bill that is presented to the Legislature.

Anonymous and bobpursley
can you please Anonymous and bobpursley explain this to me. Please and thank you

physics
okay but can you explain to me how to find N1 and N2

physics
can u explain to me what you mean by y direction is equal to and for the force *distance *the angle i don't know the angle for the question

physics
you just have to add w w w to the website

physics
img145.imageshack.us/img145/7130/picture1n.png this is basically the diagram to my question A person of mass m = 62 kg is doing push-ups as shown in the attached figure. The distances are a = 91 cm and b = 60% of l1. Calculate the vertical component of the normal force exerted...

math
use the distributive property so 100*20 and 100*40 then multiply them :)

Chemistry
A certain brand of iron suppluement contains FeSo4 7H20 with miscellaneous binders and fillers suppose 22.93 mL of KMnO4 solution used in the question above are needed to oxidize Fe2+ to Fe3+ in a 0.4927g pill. What is the mass percent of FeSo4 7H20(molar mass 278.03 g/mol) in...

CHEMISTRY
Thanks

precalc
If a savings fund pays interest at a rate of 10% per year compounded semiannually, how much money invested now will amount to $5000 after 1 year? Please round the answer to the nearest cent.

Physics
Your car is stuck in the mud and two friends are helping you. One is pulling on your car with a force of 370 N at a 40 degree angle and the other is pulling with a force of 450 N at a 30 degree angle. A force of 725 N is required to remove the car. Is the car still stuck? Plea...

1st grade
how are elephant and dinosaur and whales are alike

Science
Cannabis tricks nerves in the brain into sending distorted messages. Which of the drugs effects on the body could this explain??? Helpp!

Physics
What is the equation for average velocity given x1 (initial distance), x2 (final distance), t1 (initial time) and t2 (final time)?

pre calc trig check my work please
sin x + cos x -------------- = ? sin x sin x cos x ----- + ----- = sin x sin x cos x/sin x = cot x this is what i got, the problem is we have a match the expression to the equation work sheet and this is not one of the answers. need to figure out what im doing wrong so i can g...

3rd grade math
use any method estimate 667-651

3rd grade math
use any methond to eastimate each difference

Math
Meg wants to install square tiles in a rectangular room. How can identifying common factors help her decide if any tiles will need to be cut? Use numbers to help you explain. And if the rooms aren't the size of the tiles then what do I do?

Food
main nutrient suppkied by meat and alternatives is carbohydrates?

Food
Main mineral supplied by dairy products?

Business
How can lean manufacturing and near-sourcing help a company gain a competitive edge and prepare for the future?

pleaese help math
12p^2q|7mn^3|3p^3q^3|21n^4

math
-3v+3 _______ 6v+5 is to make sense, the values that v can take must be restricted. State the restriction on v

math 208
21n^4 ______ 5x^3y^4 _______ 7mn^2 _______ 20x^2y

8th grade math
its 2/3

math 209
machine produces 192 bolts in 20 minutes. At the same rate, how many bolts would be produced in 50 minutes? thank you

math 209
A certain medicine is given in an amount proportional to a patient's body weight. Suppose a patient weighing 108 pounds requires 135 milligrams of medicine. What is the weight of a patient who requires 260 milligrams of medicine?

business
Today's progressive managers:

math
2" diameter cardboard core

math
what is the formula to estimate the amount of fabric that is on a 2" cardboard core?

Physics
23.3

Discreet Mathematical Structures
Use proof by contraposition to prove the following statement: If A is the average of two positive real numbers then one of the two numbers is greater than or equal to A. Proof. Domain: positive real numbers P: A=(x+y)/2 Q: x is greater than or equal to A or y is greater than o...

physics
A baseball player hits a baseball (m = 0.145 kg) The ball is initially traveling horizontally with speed of 36 m/s. The batter hits a fly ball as shown, with a speed vf = 54 m/s. (a) What is the magnitude and direction of the impulse imparted to the ball? (b) If the ball (m = ...

calculus
can someone check these for me: 18. All edges of a cube are expanding at a rate of 6 cm per second. How fast is the volume changing when each edge is a) 2 cm and b) 10 cm. a)72 cm^3/sec b)1800 cm^3/sec 20. The formula for the volume of a cone is v=(1/3)(pi)(r^2)h. Find the rat...

Calculus
The answer is f'(x)=2((x^2+3)^5+x)[5(x^2+3)^4(2x)+1] I don't understand where the +1 at the end comes from

Calculus
find the derivative of f(x)=((x^2+3)^5+x)^2 using the chain rule. I know that I would start with f'(x)=2((x^2+3)^5+x) but I don't know how to do the rest

physics
Using the equation provided we can just substitute our knowns and solve for a. (15m/s)^2=(0m/s)^2+2a(1m) a=112.5 m/s^2 F=ma F=(60kg)(112.5m/s^2) 6750 N

math
Estimate f′(−3) where f(x) = x^3 + 8x^2 − 10x − 1 to within one decimal place by using a small enough interval. f′(−3) ≈

math
(i) Compute the average rate of change over the shortest interval to the left of the point of interest (for instance, for the interval from 6 to 9). (ii) Compute the average rate of change over the shortest interval to the right of the point of interest (for instance, for the ...

business
free cash flow

descriptive essay
bobpursley- The essay has to describe a place. The thesis has to have a key term that refers to the place we are describing.

descriptive essay
Thesis statement: My bedroom, which I share with my boyfriend and my daughter, is unbearably crowded. The professor wants one paragraph describing something to contrast to our main idea. That paragraph is about my mom's house. The rest of the essay is describing my bedroom.

descriptive essay
This is my introduction paragraph for a descriptive essay. My professor told me that the thesis was a fact, not an idea. Is there a way that I can reword it to make it an idea? Though being a parent is one of the greatest joys of life, teen parenting comes with a few consequen...

calc
Thats what I got whenever I simplified it

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