Thursday

September 18, 2014

September 18, 2014

Total # Posts: 753

**Math**

The speed of the current in a stream is 4 mi/hr. It takes a canoeist 96 minutes longer to paddle 13 miles upstream than to paddle the same distance downstream. What is the canoeist's rate in still water?
*September 15, 2014*

**math**

given the domain of g(x) is (-3,5) and the range of g(x) (-10, 10) find the domain and range of the transformed function 4g(x-7)+12
*September 14, 2014*

**Math**

A pizza box with a square base is to be made from a rectangular sheet of cardboard by cutting six 1-inch squares from the corners and the middle sections and folding up the sides (see the figure). If the area of the base is to be 144 in^2, what size piece of cardboard should ...
*September 14, 2014*

**Physics**

While entering a freeway, a car accelerates from rest at a rate of 2.3 m/s2 for 12 s.How far does the car travel in those 12 s, in meters?
*September 14, 2014*

**math**

You are running a fuel economy study. one of the cars you find is blue. it can travel 35 1/2 miles on 1 1/4 of gasoline. Another car is red. It can travel 27 1/5 on 4/5 gallon of gasoline. What is the unit rate for miles per gallon for the blue car? what is for the red?
*September 10, 2014*

**Math**

(2x^3y^2z)-2/(3x^4yz^-2)^-2
*September 10, 2014*

**math**

A rectangular box is to have a square base and a volume of 30 ft3. The material for the base costs 33¢/ft2, the material for the sides costs 10¢/ft2, and the material for the top costs 24¢/ft2. Letting x denote the length of one side of the base, find a function...
*September 7, 2014*

**Math**

Simplify each expression. Write your answer using a postive exponent. 1.2^0 divided by 1.8 ^2
*September 2, 2014*

**Math**

Which inequality is correct? A. ^11 <^22 < 11 B. 11 < ^11 < ^22 C. ^11 < 11 < ^22 D. ^22 < ^11 < 11 My answer is c is that correct
*August 14, 2014*

**geometry**

What is the distance between (-4,3)and (5,-2)
*July 16, 2014*

**geometry**

which set of ordered pairs has point symmetry with respect to the origin (0,0) 1- (-12,5), (-5,12) 2- (-12,5), (12,-5) 3- (-12,5), (-12,-5) 4- (-12,5), (12,5)
*July 16, 2014*

**math**

Which of the following is a negation of the statement below? All cats are not mammals. All mammals are not cats. All cats are mammals. Some cats are mammals. All mammals are cats.
*July 16, 2014*

**math**

theres two that are right I got the one just not the other can you please help
*July 16, 2014*

**math**

Which statements about a rhombus are always true? Its diagonals are congruent. All angles are congruent. All sides are congruent. Its diagonals are Û to each other.
*July 16, 2014*

**math**

so never
*July 16, 2014*

**math**

always
*July 16, 2014*

**math**

Determine if the statement is always, sometimes, or never true: A right triangle is an obtuse triangle. always sometimes never
*July 16, 2014*

**math**

The altitude of an equilateral triangle is 6 square 3 units long. The length of one side of the triangle is ____ units.
*July 14, 2014*

**math**

Find the coordinates of the midpoint of the segment whose endpoints are given. W (-3, -7) and X (-8, -4)
*July 14, 2014*

**math**

If the equation of a circle is (x + 5)2 + (y - 7)2 = 36, its center point is
*July 10, 2014*

**math**

If the point (a,3) lies on the graph of the equation 5x + y = 8, then a=
*July 10, 2014*

**math**

If the equation of a circle is (x + 5)2 + (y - 7)2 = 36, its radius is
*July 10, 2014*

**math**

Find the surface area of an orange with a 3'' radius.
*July 9, 2014*

**math**

The radius of one sphere is twice as great as the radius of a second sphere. Find the ratio of their surface areas.
*July 9, 2014*

**math**

Find the slant height for a right circular cone with a radius of 3 and a height of 5.
*July 9, 2014*

**marh**

The radii of two circles are in the ratio of 3 to 1. Find the area of the smaller circle if the area of the larger circle is 27 sq. in.
*July 8, 2014*

**General Physics 1**

1) A car moving with an initial velocity of 29.6 m/s decreases to a velocity of 17.9 m/s over a time interval of 4.08 seconds. (a.) What is the average acceleration of the car during this time? (b.) Assuming the acceleration is constant, how far did the car travel during this ...
*June 16, 2014*

**Hileyville Hight**

37.8 divided by 10 3
*May 23, 2014*

**English 30**

How does the short story "Happy Event" by Nadine Gordimer relate to the impact of an individual's ambition on self and others?
*April 23, 2014*

**chemistry**

what type of reaction occurs Fe3O4 + 4H2 → 3Fe + 4H2O
*April 18, 2014*

**help**

I recently had an essay on illegal immigrants in the United States and I wrote in there about Mexican workers in the US sending money to Mexico and I got a 100 so I believe A is right.
*March 4, 2014*

**Math**

When the sum of all the positive even numbers is 420, find the largest even number in the sequence.
*February 25, 2014*

**math**

James measures the length of a mask that he made an art class. it measures 6 3/4 inches between which two inch marks on the ruler is measurement
*February 10, 2014*

**physics**

A puck is moving on an air hockey table. Relative to an x, y coordinate system at time t = 0 s, the x components of the puck's initial velocity and acceleration are v0x = +5.3 m/s and ax = +2.6 m/s2. The y components of the puck's initial velocity and acceleration are ...
*February 10, 2014*

**physics**

The Space Shuttle travels at a speed of about 5.05 x 103 m/s. The blink of an astronaut's eye lasts about 94.4 ms. How many football fields (length = 91.4 m) does the Space Shuttle cover in the blink of an eye?
*February 3, 2014*

**phsyics**

A jogger accelerates from rest to 3.65 m/s in 3.46 s. A car accelerates from 24.0 to 40.1 m/s also in 3.46 s. (a) Find the magnitude of the acceleration of the jogger. (b) Determine the magnitude of the acceleration of the car. (c) How much further does the car travel than the...
*February 3, 2014*

**Social Studies**

In what way were Bernardo de Galvez's adventures like those of another war hero?
*January 21, 2014*

**chemistry**

How many moles of protons are present in 7.54 grams of Rubidium? Report your answer to 3 significant figures.
*January 17, 2014*

**Math**

I dont get this too, can you help me too? Im a fifth grader too so I cant do Algebra.
*January 16, 2014*

**math**

Melissa has 10 coins in her pocket. 2 quarters 3 dimes 4 nickel 1 penny What is the theoretical probability of pulling a quarter out of your pocket, putting it back, then pulling out a penn? My answer is 1/50 Also what is the theoretical probability of pulling a nickel out of ...
*January 9, 2014*

**home inspection**

Based on standards of practice guidelines, which of the following home components is normally required to be inspected? A. Awnings C. Storm window B. Storm door D. Balconies
*December 4, 2013*

**brief calc**

p = 8 − 2q1/3; p = 6 same as before calculate surplus
*December 4, 2013*

**brief calc**

q = 130 − 2p; p = 11 calculate consumers surplus at p im getting 9930, but it is wrong.
*December 4, 2013*

**Gen Chem II**

This is in a nuclear radiation lab. (gamma rays from Cs 137 passing through lead. initial radiation (with one plate) 500cpm final radiation intensity with 2 plates 300cpm thickness of 1 absorbing plate in centimeters 0.635 I need to figure out the penetration factor and i need...
*December 3, 2013*

**calc**

Calculate the 5-unit moving average of the function f(x) = x^2/3
*November 26, 2013*

**brief calc**

evaluate the integral using integration by parts 7xe^-x
*November 19, 2013*

**brief calculus**

x/(x − 6)^2 I get ln(x-6)- 6/(x-6)+ C but it isn't correct, what should the answer be?
*November 18, 2013*

**Chemistry**

seriously, any help would be much appreciated. You conduct another experiment on silver condensation. You add 8.0 g of silver nitrate to 200 mL of pure water. You attach a single 850 mAh AAA battery (at 1.3 V) to the electrochemical cell. You can assume that the entire battery...
*November 18, 2013*

**Gen Chem II**

You conduct another experiment on silver condensation. You add 8.0 g of silver nitrate to 200 mL of pure water. You attach a single 850 mAh AAA battery (at 1.3 V) to the electrochemical cell. You can assume that the entire battery charge is useable for electroplating. You get ...
*November 18, 2013*

**brief calc**

Calculate the total area of the region described. Do not count area beneath the x-axis as negative. Bounded by the curve y = square root of x the x-axis, and the lines x = 0 and x = 16 This is under Integrals, i don't know what i'm doing wrong, please help
*November 6, 2013*

**Brief calculus**

The marginal cost of producing the xth box of CDs is given by 9 − x/(x^2 + 1)^2. The total cost to produce 2 boxes is $1,200. Find the total cost function C(x). I'm getting 9x-(1/(x^2 - 1))+1181.9 but i guess its wrong
*November 3, 2013*

**Algebra**

how would you solve these two equations. ln x + ln(x+1)=1 ln(x+5) = ln(x-1) - ln(x+1)
*October 30, 2013*

**Gen Chem 2**

How many equivalence points would be visible for a solution of 1.0M sulfurous acid titration. Is it just two because in H2SO3 there are two H+ ions?
*October 29, 2013*

**brief calculus**

I have everything right but the last question asking how many cases per week The consumer demand equation for tissues is given by q = (97 − p)^2, where p is the price per case of tissues and q is the demand in weekly sales. (a) Determine the price elasticity of demand E ...
*October 29, 2013*

**calc**

I have everything right but the last question asking how many cases per week The consumer demand equation for tissues is given by q = (97 − p)2, where p is the price per case of tissues and q is the demand in weekly sales. (a) Determine the price elasticity of demand E ...
*October 28, 2013*

**brief calculus**

I found that c=1 but i can't get the other two questions The velocity of a particle moving in a straight line is given by v(t) = t2 + 7. (a) Find an expression for the position s after a time t . s(t) = _____ + C (b) Given that s = 1 at time t = 0, find the constant of ...
*October 28, 2013*

**math**

-2/3x>8
*October 28, 2013*

**brief calculus**

Find f(x) if f(1) = 1 and the tangent line at (x, f(x)) has slope 6/x
*October 27, 2013*

**Chemistry**

Oh, ok well i came out with a pH of 5.22. pH = pKa + log A/HA. I came up with .15M as A and .05 as HA. So 4.74+log(3)= 5.22.
*October 22, 2013*

**Chemistry**

what is the resultig pH if 0.005 mol of NaOH is added to 100.0mL of buffer containing 0.010 mol acetic acid (CH3COOH,pKa = 4.74)and 0.010 mol sodium acetate (NaCH3COO)? (Assume the final volume is 100 mL) So i worked it out, i just need to double check the pH. Let me know what...
*October 22, 2013*

**Chemistry**

What determines the greatest buffer capacity when looking at solutions? The professor said he would have a list of solutions on the test and we choose the one with the best buffer capacity
*October 17, 2013*

**Gen Chm 2 **

What determines the greatest buffer capacity when looking at solutions? The professor said he would have a list of solutions on the test and we choose the one with the best buffer capacity.
*October 17, 2013*

**Science **

What part of the circulatory system moves the blood through your body?
*October 16, 2013*

**Math**

1. Multiplying to make 50. Ways to multiply with to factors. Ways to multiply with more than two factors. 2. Multiplying to make 72. Ways to multiply with two factors: Ways to multiply with more than two factors:
*October 15, 2013*

**Chm 2**

The question asks, Consider the following weak acids and their Ka values Acetic acid Ka = 1.8x10^-5 Phosphoric acid Ka = 7.5x10^-3 Hypochlorous acid Ka = 3.5x10^-8 What weak acid-conjugate base buffer system from the acids listed is the best chouce to prepare the following ...
*October 15, 2013*

**chm 2**

On the same type of problem as the previous one, it is now asking the pH of 1ml of NaOH plus 50ml water. If i solve for pOH taking .001ml / .051, i get the same number as before, can i just subtract the number from 14 to get pH of the basic solution? 12.29 was what i came up ...
*October 14, 2013*

**Chem 2**

So i need to calculate the pH of 50ml water (de-ionized) with 1 ml of 1M HCl. So the moles of HCl i think is .001 divided by the total amount of solution (.051). I get 0.0196, then i take the negative log of this number and it comes out to 1.71 roughly. Does this sound right? ...
*October 14, 2013*

**Brief Calculus**

if s''(t)=((-)1/4t^3/2) +8 Then what is s''(16)?
*October 11, 2013*

**Brief Calculus**

The position s of a point (in feet) is given as a function of time t (in seconds). s = −10 + t − 15t2; t = 8 (a) Find the point's acceleration as a function of t. s''(t)= I know this answer, it is -30 (b) Find the point's acceleration at the ...
*October 10, 2013*

**Math**

Explain how you know whether an estimate of a product is an overestimate or an underestimate?
*October 10, 2013*

**pure maths, life science, physical science, geogra**

what can you study with those subjects
*October 10, 2013*

**General genetics**

I'm trying to find out how we know that bacteria involves contact before the transfer of DNA during conjugation. In the book, all they say is that DNA is not transferred along the f pilus as previously thought, but it is contacted first, then a channel opens up for the ...
*October 9, 2013*

**Brief Calculus**

Nevermind i figured it out. 30.1 years to maximize value
*October 8, 2013*

**Brief Calculus**

Last one for today... As the financial consultant to a classic auto dealership, you estimate that the total value (in dollars) of its collection of 1959 Chevrolets and Fords is given by the formula v = 303,000 + 1,020t2 (t ¡Ý 5) where t is the number of years from...
*October 8, 2013*

**Brief Calculus**

Minimize F = x2 + y2 with x + 2y = 5 Thank you
*October 8, 2013*

**physics**

yes to solve its the distance traveled/ 40(this is velocity) for acceleration its the velocity/5 so v=d/40 a=v/5
*October 5, 2013*

**physics (it's rather urgent help is appreciated**

@Anonymous how do you solve for the 7th question
*October 5, 2013*

**physics (it's rather urgent help is appreciated**

@ss01 if you check homework 2 the 2nd last question it shows you how to do question 2. for quetion 3 Ac must be 10m/s so you get 10=v^2/r and from there you can solve since i don't know what value of r you got
*October 5, 2013*

**physics (it's rather urgent help is appreciated**

which part?
*October 5, 2013*

**physics (it's rather urgent help is appreciated**

i got all except this one
*October 5, 2013*

**physics (it's rather urgent help is appreciated**

ss01 how do you solve this then
*October 5, 2013*

**physics**

We are standing at a distance d=15 m away from a house. The house wall is h=6 m high and the roof has an inclination angle β=30 ∘. We throw a stone with initial speed v0=20 m/s at an angle α= 35 ∘. The gravitational acceleration is g=10 m/s2. (See figure...
*October 5, 2013*

**physics**

An elevator is stopped at the ground floor. It starts moving upwards at constant acceleration a>0 for 5 seconds. It then keeps a constant speed for 35 seconds. Finally, it slows down with an acceleration of the same magnitude (but opposite direction) −a , until it ...
*October 5, 2013*

**physics**

physics
*October 5, 2013*

**URGENT**

We are standing at a distance d=15 m away from a house. The house wall is h=6 m high and the roof has an inclination angle β=30 ∘. We throw a stone with initial speed v0=20 m/s at an angle α= 37 ∘. The gravitational acceleration is g=10 m/s2. (See figure...
*October 5, 2013*

**physics**

anon did you happen to solve the second last question? the one with the inclined roof
*October 5, 2013*

**physics**

An elevator is stopped at the ground floor. It starts moving upwards at constant acceleration a>0 for 5 seconds. It then keeps a constant speed for 35 seconds. Finally, it slows down with an acceleration of the same magnitude (but opposite direction) −a , until it ...
*October 5, 2013*

**physics**

An elevator is stopped at the ground floor. It starts moving upwards at constant acceleration a>0 for 5 seconds. It then keeps a constant speed for 35 seconds. Finally, it slows down with an acceleration of the same magnitude (but opposite direction) −a , until it ...
*October 5, 2013*

**5th grade math**

I need to use quarters, dimes, nickles and pennies to make the following: $1.53 in 12 coins $2.53 in 20 $2.32 in 15 coins $2.00 in 22 $1.45 in 10 coins $1.76 in 16 coins $0.85 in 11 coins $1.01 in 12 coins $1.29 in 15 coins
*September 24, 2013*

**History**

8 is also wrong. Ghana is the first West African kingdom to benefit from the gold and salt trade because if you recall, between 400 and 1100, Ghana prospered because they were located in the middle of the salt mines of the Sahara and the gold mines of the south. In addition to...
*September 20, 2013*

**6th grade math**

look at 2 pounds as 6/3 pounds, (or 6 portions of 1/3 pound of beef.) Then you have an even number to compare with 6 cups. if you only need 1 cup, then you only need 1/3 pound of beef.
*September 17, 2013*

**Calculus**

f(x) = 4/5x i need to find the derivitave but i don't know how to start this one. I know the derivitave of 4 is just zero, and i know the derivative of 5x is 5. But the answer isn't 0/5. Help please.
*September 15, 2013*

**Math Homework HELP!**

Find the value of k so that the line containing the points (k,−8) and (−3,−5) is parallel to the line containing the points (9,7) and (12,5).
*September 14, 2013*

**algebra**

In 2010 a company reported a net income loss of 23.8 million. In 2011 the company reported a net income gain of 10.4 million. How much more income did the company earn in 2011 than in 2010
*September 4, 2013*

**Economics**

There are 1,000 hot dog stands in Chicago at any given moment. Due to health concerns, a significant number of families move out of the city. Would there be a shift in the demand curve, the supply curve, or both? I'm thinking that if this significant number moves out of ...
*August 13, 2013*

**math**

for a class trip a teacher brought 25 students tickets and 5 adult tickets: ~ write an expression for the total cost of tickets purchased ~if students tickets cost $4 each and adult tickets cost $6 each, how much money did the teacher spend on tickets?
*August 10, 2013*

**math**

order of operations 10) 2^4-3^2+5^2 11)32/(-7+5)^3 12)4^3-(2-5)^3
*August 10, 2013*

**math**

while riding her bike, jennifer burns 450 calories every 1/2 hour. Based on this rate, how many calories will jennifer burn if she rides her bike for 1 3/4 of an hour?
*August 10, 2013*

**physics**

A wind turbine is initially spinning at a constant angular speed. As the wind's strength gradually increases, the turbine experiences a constant angular acceleration 0.170 rad/s2. After making 2870 revolutions, its angular speed is 131 rad/s. (a) What is the initial ...
*July 16, 2013*

**Thermodynamics**

A lawnmower tractor engine produces 18hp using 40kW of heat transfer from burning fuel. Find the thermal efficiency and the rate of heat transfer rejected to the ambient. I converted the power to 13.24kW then found the efficiency by dividing 13.24kW by 40kW but the answer is ...
*June 12, 2013*

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