Sunday

April 20, 2014

April 20, 2014

Total # Posts: 488

**Science... plz help~!**

The popul Vuh indicates that the mayans valued

**SS**

Thanks Ms.sue

**SS**

tourism is essential to the economies of which two nations? A.haiti and the dominican republic B.haiti and jamaica C.haiti and the bahamas D.jamaica and the bahamas

**help**

can someone help me out here? please and thanks How has Mexico's culture been shaped by conflict among different people?

**Help me with this math ms sue.**

josh post the answers and ill try and mrs.sue can u answer my newest question

**help**

can someone help me out here? please and thanks How has Mexico's culture been shaped by conflict among different people?

**please check(Social studies)**

i cant find it anywhere

**please check(Social studies)**

please checkk 3. Mexico is building a stronger workforce by A.holding free elections B.permitting remissions C.eliminating competition D.investing in education(I PICK D.) if you answer i really hope your correct !

**Physics**

A sky-diver steps out from a helicopter and falls 5s before reaching her terminal velocity of 50 mi/h. Her acceleration just before reaching terminal velocity is what?

**Math**

The volume of a sphere is increasing at a rate of 5 cm^3/s. Find the rate of change of its surface area when its volume is 500pi/3 cm^3.

**math(algebra)**

D. 1.99(x-4) + 11.96 Because you can figure out the total cost of the four costing $2.99 (11.96), that has to be added to the other half of the equation. Simply multiplying 1.99 by x would include all apps instead of just the remaining (x-4).

**language arts (check answer)**

Which of the following words most likly comes for africa? A.boutique B.safari C.violin D.allegro i pick B.

**help me with this language arts.**

josh just post answers gosh

**chemistry**

458.03

**geometry**

triangle GHE GH=10 HE = 17 hypotenuse GE =21 HF is an altitude Find HF

**math**

Whoops! it's suppose to be -3 squareroot 426!

**math**

-3ã426 What's the answer? Thanks! :)

**Sentence Agreement Errors**

What agreement error would this sentence be? One of the options concerning his future surgeries were discussed with him. Verb tense agreement error, subject/verb agreement error, pronoun agreement error, modifier placement error or parallel structure error

**Maths**

Anybody know what to do??

**Maths**

Please help! I'm so confused!

**Maths**

Jacob buys a car with 7,000 miles on it. He drives an average of 220 miles a week. Write an equation to represent the number of miles, m, on the car after any number of weeks, w. Explain each part of the equation. Thanks so much!!! :)

**Chemistry**

Yes, I just copied the equation off of a different problem. Thank you for your help!

**Chemistry**

k = 0.693/t1/2 ln(No/N) = kt No = 100 N = 65.7 k from above. solve for t in years. I found this equations, but my question is what is k?

**Chemistry**

Geologists can estimate the age of rocks by their uranium-238 content. The uranium is incorporated in the rock as it hardens and then decays with first-order kinetics and a half-life of 4.5 billion years. A rock is found to contain 82.7% of the amount of uranium-238 that it co...

**math**

the half life of the carbon isotope C14 is about 5700 years. A. about how many years does it take 1000 grams of this substance to decay to 500 grams? B. about what percent of the original amount would you expect to find after 1000 years?

**physics**

A 74 kg box rests on a level surface. The coefficient of static friction, µS = 1.1 and the coefficient of kinetic friction, µK = 0.7 . What is the magnitude of Friction on the box from the surface?

**grammar**

In Which oneof the following sentences is the number written correctly? A.the parcel of land was advertised as two hundred forty-three and three-quarters acres.b.the college has an,endowment of more than $187million.c.john just paid $33 thousand forhis New car.d.one hundred a...

**Algebra**

A $130,000 home bought with a 20% down payment and the balance financed for 30 years at 7.5% Find the monthly payment for the loan

**CENCEPTS IN HEALTHCARE**

what is the procedures and resources available for assisting patients who use English as a second language, who is hearing impaired, sight impaired, or who have any other type of physical or diversity related disposition that should be addressed to provide quality care to that...

**chemistry**

i have never used the ice table before so i think its basic class. so do i just add those 2 numbers together? Thanks DrBob

**chemistry**

What is the hydrogen ion concentration, in mol dm−3, when 2.00 g of sulfuric acid is dissolved in water to give 0.400 dm3 of solution? could you explain in a simple and clear way please because im not very good at chemistry. thanks in advance

**PreCalculus**

Sin5x cos2x + cos5x sin2x=

**geometry**

were did you show me I dont have anything

**geometry**

How much more pizza is in a 12-in. diameter pizza than an 8-in. diameter pizza? Round your answer to the nearest hundredth. Be sure to show all work and label your answer. TWO points for the work...TWO points for the corrrect answer

**geometry**

4.2

**social studies**

making laws

**social studies**

The main work of representatives in a parliament is a.running trials b.trining an army c. kkeeping the peace d.making laws

**Physics (Algebra-based)**

A barefoot field-goal kicker imparts a speed of 35 m/s to a football initially at rest. If the football has a mass of 0.39 kg and the time of contact with the ball is 0.038 s, what is the force exerted by the ball on the kicker’s foot? I tried the formula F=(m(vf-vi))/cha...

**physics**

An elevator has a mass of 500 kg. It may safely carry an additional mass of 1000kg and accelerate upward at 2m/s2. What is the tension in the cable?

**Physics (Algebra-based)**

Thank you!

**Physics (Algebra-based)**

A block starts at rest and slides down a frictionless track except for a small rough area on a horizontal section of the track.It leaves the track horizontally, flies through the air, and subsequently strikes the ground. gravity= 9.81 m/s^2. height1=4.1m---- is initially dropp...

**help**

If you triple 4 and subtract 2 each day, how many days until you have zero?*

**math**

10

**math**

10 pounds

**Physics (Algerbra-based)**

Thank you!

**Physics (Algerbra-based)**

A particle is moving clockwise around a circle with a radius 3.31 m. The magnitude of the total acceleration of the particle at the given instant is 14.3 m/s^2; the angle between the vector of total acceleration and the radius-vector of the particle is 30◦. Find the cent...

**Math**

David has 50 bills in his wallet worth $400 all fives and tens dollar bills. How many of each bill does he have

**algebra**

A line with a slope of -2 passes through the point (1, 7). What is the closest point on the line above (1, 7) which has whole number coordinates?

**Geography**

Would outdoor locations in countries such as Singapore with the highest temperatures also have the highest relative humidities? Explain 2 reasons? Would outdoor locations in countries such as Singapore with the highest temperatures necessarily have the highest dew point temper...

**Math**

A bag contains two blue, three purple, four yellow, two red, three green and one orange marbles. What is the conditional probability that, without replacement, the second marble is purple given that the first marble was green?

**science**

describe how matter cycles through an ecosystem

**Calculus**

Find the derivative of m(x)=1/(x+1) by using the definition of the derivative.

**Calculus**

k=+/- 8 I figured it out.

**Calculus**

It is supposed to be x^2-k^2 over x-8 And the limit is 8

**Calculus**

Find a value of the constant k such that the limit exists. x^2-k^2 lim _________ x->8 x-8 k=+/_

**Pre-Calculus**

An Alfa Romeo going at 70 mph requires 169 feet to stop. Assuming that the stopping distance is proportional to the square of velocity, find the stopping distances required by an Alfa Romeo going at 35 mph and at 140 mph (its top speed).

**Pre-Calculus**

A pomegranate is thrown from a ground level straight up into the air at time t = 0 with velocity 67 feet per second. Its height at time t seconds is f(t)=-16^2+67t. (a) Find the time it hits the ground and (b) the time it reaches its highest point. (c) What is the maximum heig...

**Pre-Calculus**

For a boat to float in a tidal bay, the water must be at least 2.5 meters deep. The depth of the water around the boat, d(t), in meters, where t is measured in hours since midnight, is d(t)=5+4.6sin(0.5t) Use three decimal places in all intermediate calculations. (a) What is t...

**Pre-Calculus**

Find a solution to the equation if possible. Give the answer in exact form and in decimal form rounded to three decimal places. 1=21tan(2x+2)-6

**3rd grade math**

30/100 = 3/10

**Pre-Calculus**

The exponential function y(x)=Ce^ax satisfies the conditions y(0)=6 and y(1)=7. (a) Find the constants C and a. Enter the exact value of a. (b) Find y(2). Enter the exact answer. Simplify the answer so it does not contain any logarithms.

**Pre-Calculus**

At time t hours after taking the cough suppressant hydrocodone bitartrate, the amount A, in mg, remaining in the body is given by A=13(0.82)^t. a) What was the initial amount taken? b) What percent of the drug leaves the body each hour? c) How much of the drug is left in the b...

**math**

Chord BC is drawn in a circle with a radius of 3cm. Chord BS is 4cm long. Find the perpendicular distance from A to chord BC

**Early Child Educ.**

the newest organization to accredit afterschool programs is the

**BIOCHEMISTRY. PLEASE HELP! URGENT!!!!!**

Appreciate if you could help me answering the following questions! thank you!! How would you prepare a 20% homogenate from a 2.0g of liver using 0.25M sucrose? why is it necessary to cool the homogenate during homogenization?

**Biochemistry**

Appreciate if you could help me answering the following questions! thank you!! How would you prepare a 20% homogenate from a 2.0g of liver using 0.25M sucrose? why is it necessary to cool the homogenate during homogenization?

**Chemestry**

Find the molarity of a solution containing 0.75 mol of NaCl with a volume of 1.5 L.

**Math**

Ella walked 4.5 km/h to her friends house. She walked back home from her friends house at 3.5 km/h. She walked a total of 40 minutes. How many minutes was her walk on her way to her friends house?

**algebra**

my scenario, to start a small business you will need a loan of $50.000 to purchase the restaurant. The bank interest rate 9% that compounds monthly for 7 years. What is the monthly payment for this loan, what is the fomula that you will use and the values for each variable to ...

**algebra**

a small business loan in the amount of 50,000 need to interest rate of 9% that compounds monthly for 7 years. What is the payment for 7 years, need formula for this. And what is the balance of the loan at the end of the 1st year? Show the formula used for each variable and the...

**CALC #**

Use Green's Theorem to evaluate F · dr. C (Check the orientation of the curve before applying the theorem.) F(x, y) = y cos x − xy sin x, xy + x cos x , C is the triangle from (0, 0) to (0, 12) to (3, 0) to (0, 0)

**math**

how do you figure out the diameter of a pipe that is 40 feet high and holds 200000 gallons

**Chemistry**

thank you!!

**Chemistry**

someone help pls!! percentage of ethanol in the "blood" sample on a v/v basis is 0.0143% v/v. is the "blood" sample analysed over the limit for driving? (legal limit is 80mg alcohol per 100mL blood. assume the density of ethanol is 0.785g/mL and the density...

**Algebra**

4ã(50x)+3ã(2x)+ã(72x) Combine. Assume that all variables represent nonnegative real numbers.

**Calc 3**

The DNA molecule has the shape of a double helix. The radius of each helix is about 10 angstroms (1 Å = 10−8 cm). Each helix rises about 34 Å during each complete turn, and there are about 2.9 × 108 complete turns. Estimate the length of each helix. (Ro...

**Calc 3 PLEASE HELP!!!!**

no you have to use lagrange multipliers to do it and i figured out all five equations but i can not solve any of them

**Calc 3 PLEASE HELP!!!!**

Find the maximum and minimum volumes of a rectangular box whose surface area is 1300 cm2 and whose total edge length is 200 cm.

**Calc 3**

If a function of one variable is continuous on an interval and has only one critical number, then a local maximum has to be an absolute maximum. But this is not true for functions of two variables. Show that the function f(x,y)= 3xe^y − x^3 − e^(3y )has exactly one...

**Math**

The base of an isosceles triangle is one inch shorter than the equal sides, and the altitude of the triangle is two inches shorter than the equal sides. What is the length of the equal sides?

**chemistry**

Identify a haloalkane and describe the manner in which it functions as an anesthetic.

**Calc 3**

Find parametric equations for the tangent line to the curve of intersection of the paraboloid z = x^2 + y^2 and the ellipsoid 6x^2 + 5y^2 + 7z^2 = 39 at the point (−1, 1, 2)

**Calc 3**

can you please explain to me where you got the numbers for T(-1,1,2) I know you did the cross product but I can not seem to get the same numbers as you. Please explain

**Calc 3**

Find parametric equations for the tangent line to the curve of intersection of the paraboloid z = x2 + y2 and the ellipsoid 6x2 + 5y2 + 7z2 = 39 at the point (−1, 1, 2)

**Calc 3**

At what point on the paraboloid y = x2 + z2 is the tangent plane parallel to the plane 7x + 2y + 3z = 2? (If an answer does not exist, enter DNE.)

**Lang Arts**

Would #2 be A?

**physics**

Two blocks are connected by a lightweight, flexible cord that passes over a frictionless pulley. If m1 = 3.8 kg and m2 = 9.2 kg, and block 2 is initially at rest 140 cm above the floor, how long does it take block 2 to reach the floor?

**physics**

Two blocks are connected by a lightweight, flexible cord that passes over a frictionless pulley. If m1 = 3.8 kg and m2 = 9.2 kg, and block 2 is initially at rest 140 cm above the floor, how long does it take block 2 to reach the floor?

**Calc 3**

thank you!!!!!!

**Calc 3**

Use the Chain Rule to find ∂z/∂s and ∂z/∂t. z = tan(u/v), u = 7s + 4t, v = 4s − 7t

**Calc 3**

we were not given f(x,y) the whole problem is listed above, apparently there is a link that is supposed to help us but I followed it and don't know what I am doing wrong and I cannot post the link because it is on a special homework website.

**Calc 3**

If z = f(x, y), where x = r^2 + s^2 and y = 8rs, find ∂^2z/(∂r ∂s).

**calc 3**

yes i already got parts a and b i do not know how to do part c sorry i should have specified that in my post

**calc 3**

The length script l, width w, and height h of a box change with time. At a certain instant the dimensions are script l = 7 m and w = h = 5 m, and script l and w are increasing at a rate of 6 m/s while h is decreasing at a rate of 4 m/s. At that instant find the rates at which ...

**English**

1.I started play the oboe because [I've heard] it was a challenging instrument (a) no change (b) I'd have heard (c)I've been hearing (d) I'd heard 2. That was [four years ago and, I've] enjoyed learning to play (f) no change (g) four years ago, and I've...

**physics**

A crate of potatoes of mass 13.0 kg is on a ramp with angle of incline 30° to the horizontal. The coefficients of friction are μs = 0.76 and μk = 0.35. Find the frictional force (magnitude and direction) on the crate if the crate is sliding up the ramp.

**calc 3**

Use the Chain Rule to find dw/dt. w = ln (x^2 + y^2 + z^2)^.5 , x = 9 sin t, y = 6 cos t, z = 7 tan t

**Calc 3**

Find all partial derivatives? v = (xy)/(x-y) vxx= vxy= vyx= vyy=

**physics**

A barge is hauled along a straight-line section of canal by two horses harnessed to tow ropes and walking along the tow paths on either side of the canal. Each horse pulls with a force of 540 N at an angle of 12° with the centerline of the canal. What is the net force on t...

**calc 3**

Find all partial derivatives? v = (xy)/(x-y) vxx= vxy= vyx= vyy=

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