Wednesday

February 22, 2017
Total # Posts: 2,226

**Algebra**

please help me im confused. Every item in the Just a Dollar store is priced at $1.00. When Mary Jo opens the store, there is $122.00 in the cash register. When she counts the money in the cash register at the end of the day, the total is $1,065.95. If the sales tax rate is 8.5...

*October 13, 2014*

**physics**

The weight of an astronaut plus his space suit on the Moon is only 270 N. A. How much do they weigh on Earth, in Newtons, assuming the acceleration due to gravity on the moon is 1.67m/s^2= 1584is this right? B. What is the mass of the astronaut and his space suit on the moon ...

*October 9, 2014*

**physics,electrostatics**

A 40uf parallel plate capacitor is charged to 12v. The capacitor is removed from the battery and the separation distance increased from 2mm to 3mm. What is the total charge on the capacitor? How much energy was stored in the capacitor when the distance was 2mm? By how much is ...

*October 9, 2014*

**science**

planetary accretion

*October 7, 2014*

**math**

Hold on Sir... you have lots of questions going on here please wait a few min before a tutor gets to you Thanks :D

*October 7, 2014*

**AP Calc**

Find the equation of ALL horizontal tangents to the curve y^2=x^2+4/x, if any exists. My work: Derivative- First I multiply across and got x^2+4=xy^2 2x+0=(x)(2y(dy/dx)+(y^2) 2x-y^2=2xy(dy/dx) dy/dx=2x-y^2/2xy=x-y^2/xy I don't know what to do next... Can you help me? ...

*October 6, 2014*

**AP Calc**

Find the point on the curve x=4y-y^2 where the tangent to the curve is a vertical line. My work: Finding the derivative. 1=4(dy/dx)-2y(dy/dx) 1=dy/dx(4-2y) dy/dx=1/4-2y Therefore, y cannot equal +2 or -2 Right?

*October 6, 2014*

**Math**

The answer is -13.482 if you want it in Sig. Figs then the anser will be -13.4 Hope this helped :D

*October 6, 2014*

**math**

f(x)=(x-3)(x+2) If that's what you're looking fore :) To solve for x if you're going further Use T-Chart... answer then will be x=3 and x=-2

*October 6, 2014*

**Math**

1/5^9= 5.12 x 10^-7 Work backwards: 1/5 is the conjugate of 5 therefore, if 1/5 is raised to the 9th power the opposite of that is -9. 5^-9= 5.12 x 10^-7 your answer: B

*October 6, 2014*

**Math**

Find the point on the curve x=4y-y^2 where the tangent to the curve is a vertical line. My work: Finding the derivative. 1=4(dy/dx)-2y(dy/dx) 1=dy/dx(4-2y) dy/dx=1/4-2y Therefore, y cannot equal +2 or -2 Right?

*October 6, 2014*

**Physical Education**

Correct Carbohydrates are the main energy source to the human body :)

*October 6, 2014*

**Physical Education**

Carbohydrates are the main energy source for the brain. Without carbohydrates, the body could not function properly. Protein is the major structural component of cells and is responsible for the building and repair of body tissues. Protein is broken down into amino acids, ...

*October 6, 2014*

**Math**

Thanks I understand it now :D

*October 6, 2014*

**Math**

Find the coordinatesof the point on the curve xy=10 in the first quadrant such that the normal line passes through the orgin. My work: Okay i believe this is an inverse variation. Therefore, y=10/x? Origin is @ (0,0) and i'm stuck to move on...

*October 6, 2014*

**Math- AP Calc**

If 3x+xy+4y=8, what is the value of d^2y/dx^2 at the point (1,1)? My work: 3+(x)(dy/dx)+(y)+4(dy/dx)=0 dy/dx(x+4)=-3-y dy/dx=-3-y/x+4 2nd Dervative: (x+4)(0-dy/dx)-(-3-y)/(x+4)^2 (x+4)(-(-y-3/x+4))-(-3-y)/(x+4)^2 (x+4)(y+3)/(-x+4)+(y+3)/(x+4)^2 *Mult. everything by (-x+4) ...

*October 6, 2014*

**Math**

If 3x+xy+4y=8, what is the value of d^2y/dx^2 at the point (1,1)? My work: 3+(x)(dy/dx)+(y)+4(dy/dx)=0 dy/dx(x+4)=-3-y dy/dx=-3-y/x+4 2nd Dervative: (x+4)(0-dy/dx)-(-3-y)/(x+4)^2 (x+4)(-(-y-3/x+4))-(-3-y)/(x+4)^2 (x+4)(y+3)/(-x+4)+(y+3)/(x+4)^2 *Mult. everything by (-x+4) ...

*October 6, 2014*

**math**

How do you do this problem f(x)=3x6+2x3-176;c=-2

*October 6, 2014*

**geometry**

Point C is in the interior of angle ABD. The measure of angle ABD is 40 degrees. The measure of angle DBC is 3x-5. If angle ABC is 22 degrees, what is "x"?

*September 28, 2014*

**algebra**

oh 65 and 66.

*September 23, 2014*

**algebra**

65 and 67?

*September 23, 2014*

**algebra**

its 65.5

*September 23, 2014*

**algebra**

the numbers on two consecutively numbered gym lockers have the sum of 131. what are the locker numbers?

*September 23, 2014*

**math**

-5 an 7/12 divided by 12 equals

*September 23, 2014*

**Chemistry**

Is it about 2 Zums?

*September 22, 2014*

**Chemistry**

8.5 Ed's = 10 Ebb's, 12 Ersk's = 100 Ed's and 5 Ebb's = 1 Zum. How many Zum's in approx. 1 Ersk? Starts out: 1 Ersk*__________ Ersk

*September 22, 2014*

**Physics**

The nozzle of a fountain jet sits in the center of a circular pool of radius 3.50 m. If the nozzle shoots water at an angle of 65 degrees. A) What is the maximum speed of the water at the nozzle that will allow it to land within the pool?

*September 21, 2014*

**math**

1) 4.1875 = 4 3 over 16 2) 4.5 = 4 1 over 2 3) 4.625 = 37 over 8 4) 4.75 = 19 over 4

*September 21, 2014*

**Physics**

is your d = square root of (60^2 + h basket^2) and for which question a,b or c

*September 21, 2014*

**Physics**

A Balloon carrying a basket is descending at a constant velocity of 20.0 m/s. A person in the basket throws a stone with an initial velocity of 15.0 m/s horizontally perpendicular to the path of descending balloon and 4.00 (s) later this person sees the stone strike the ground...

*September 21, 2014*

**Pshyics**

A meter stick has a mass of 0.12 kg and balances at its center. When a small chain is suspended from one end, the balance point moves 19.0 cm toward the end with the chain. Determine the mass of the chain.

*September 21, 2014*

**Pre-Cal**

Let x and y be real numbers such that x^2 + y^2 = 1. Find the maximum value of 2x - 5y.

*September 20, 2014*

**Physics**

A particle is moving at 0.75c relative to a lab on Earth. By what percentage is the Newtonian expression for its momentum in error, i.e., how wrong is the classical formula? (The percentage error is the difference between the erroneous and correct values, divided by the ...

*September 20, 2014*

**Algebra 2**

The line 4x + ky = -1 has a slope of 2/3. Find k. a. 3/2 b. 6 c. -3 d. -6

*September 17, 2014*

**Math**

You deposit $100 at the end of each quarter in a sinking fund earning 4% compounded quarterly. How many quarterly deposits must you make in order to reach your goal of saving $10,000? Round your answer off to the nearest whole number.

*September 15, 2014*

**physics**

your mom

*September 4, 2014*

**math**

I DO NOT FREAKING KNOW

*August 26, 2014*

**5th grade math**

289 x 7=2023

*August 25, 2014*

**Chemistry**

8-hydroxyquinoline (Q) can complex and precipitate many metals. A mixture of the aluminium and magnesium complexes weighed 1.0843g (MW=459.43; 312.61). When ignited, the mixture decomposed and left a residue of Al203 (MW 101.96) and MgO (MW 40.304) weighing 0.1344g. What is ...

*August 24, 2014*

**computers**

create a program that will input two quizzes and will compute for sum,difference,product,quotient and average using printf and scanf. create your own design.

*August 21, 2014*

**Math**

1165

*August 20, 2014*

**MATH**

The first month's dues will be used to rent a film about computer-related careers, to purchase a reference book, and to buy refreshments for the next meeting. If 1/2 of the money is spent on her film, 1/4 of the remainder is used for refreshments, and $7.50 is spent on the...

*August 12, 2014*

**math**

The answer is c

*August 7, 2014*

**computers**

when you connect to a remote VPN server with your laptop running windows 8 what key item is your computer allocated

*August 7, 2014*

**Chemistry**

Why the ph will be determinated as if you have 0,05M H3PO4???

*August 7, 2014*

**math hw**

42. Twenty minutes after a plane leaves the airport, it is reported to be 160 miles away. What average speed of the plane in the miles per hour?

*August 5, 2014*

**math hw**

An automobile party leaves at 7:55 A.M., and arrives at its destination 15 miles away at 8:15 A.M. What was the average rate on this trip (in M.P.H.)?

*August 5, 2014*

**math hw**

40. How far (in miles) does a car travel when its average rate is 35 miles per hour and it travels for 3 hours and 24 minutes?

*August 5, 2014*

**math test review**

18. In triangle ABC, m<C=2m<b,m<A=6m<B. what is the measure of <c? A.5 degrees B.15 degrees C.20 degrees D.30 degrees E.40 degrees

*August 4, 2014*

**math**

That was by mistake, I didn't know and typed in again.

*August 4, 2014*

**math**

1. If b is positive integer less than 200, then how many integer pairs (a,b) satisfy the equation a/b= 2/9?

*August 4, 2014*

**math**

1. If b is a positive integer than 200, then how many integer pairs (a,b) satisfy the equation a/b= 2/9

*August 4, 2014*

**math test review**

16. If the base of a right triangle is 8 (square root)2 and the hypotenuse is 18, what is the area of the triangle? A.14 B.14 square root 2 C.56 square root 2 D.64 E.64 square 2

*August 4, 2014*

**math hw**

In set of 30 different positive integers, every number is even and/or a multiple of 3. If 22 of these numbers are even and 15 are multiple of 3, then how many of these numbers are multiple of 6?

*August 4, 2014*

**math hw**

2. If a^2-b^2=20 and a+b=2, what is the value of a-b? I added the a^2-b^2+20 and a+b+20, but i couldn't get the answer to equal a-b.

*August 4, 2014*

**math hw**

10.Thirty students in a chemistry class took a test on which the overall average score was 78. If the average score for 15 of those students was 85, what was the average score for the remaining members of the class? I know that "average" means dividing, but i'm ...

*August 4, 2014*

**math**

9. In Mr.chin's math class there were g girls and b boys. The number pf girls was 5 less than twice the number of boys. What is the value of g in terms of b? this is what I have so far: 2n-5

*August 4, 2014*

**Chemistry**

2Na + 2H2O------> 2NaOH + H2 H=-386kJ If 5g of sodium is added to 200g of water in an open container: (A) How much heat is absorbed/released int he reaction? (B)What volume in formed at 22C and 102kPa? (C) If boiling point elevation constant is 0.52K molal what is the ...

*August 3, 2014*

**maths**

The Park's are buying new carpet for their house.They need about 1,175 square feet of carpet.The carpet they buy is sold by the square yard. Estimate the number of square yards of carpet the Parks need for their house. Show your work.

*August 2, 2014*

**Astronaut launches bowling ball**

A 100 kg astronaut carries a launcher loaded with a 10 kg bowling ball; the launcher and the astronaut’s spacesuit have negligible mass. The astronaut discovers that firing the launcher results in the ball moving away from her at a relative speed of 50 m/s. The astronaut ...

*July 28, 2014*

**English**

She waited patiently for her turn on line at the New Age bookstore. adjective adverb noun verb

*July 6, 2014*

**Physics**

. A stone is dropped from the top of a building that is 500m high. Disregarding air resistance how long does it take the stone to reach the ground?

*June 25, 2014*

**math**

20

*June 8, 2014*

**math**

Charlie must choose a number between and that is a multiple of , , and . Write all the numbers that he could choose. If there is more than one number, separate them with commas

*May 28, 2014*

**Physics**

A 69.5kg football player is gliding across very smooth ice at 2.15m/s . He throws a 0.470kg football straight forward. A) What is the player's speed afterward if the ball is thrown at 16.0m/s relative to the ground? B) What is the player's speed afterward if the ball ...

*May 27, 2014*

**Math please check my answer?**

1)6x+11y=30 A) x-intercept= (-24,0);y intercept =(0,19) B)x-intercept=(0,1/5);y intercept=(11/30,0)<<<< C)x-intercept= (5,0);y intercept=(0,30/11) D)x-intercept= (24,0);y intercept=(0,19)

*May 22, 2014*

**Math please check my answers?**

1) The linear function f(x) contains the points (-10, -29) and (-2, 83). If g(x) = 25x - 50, which statement is true? A. The functions f(x) and g(x) both have positive slopes. <<< B. The functions f(x) and g(x) both have negative slopes. C. The function f(x) has a ...

*May 22, 2014*

**Algebra please check my answers**

Are 1 and 2 correct?

*May 21, 2014*

**Algebra please check my answers**

Thanks! Are the others correct?

*May 21, 2014*

**Algebra please check my answers**

1) The linear function f(x) contains the points (-10, -29) and (-2, 83). If g(x) = 25x - 50, which statement is true? A. The functions f(x) and g(x) both have positive slopes. <<< B. The functions f(x) and g(x) both have negative slopes. C. The function f(x) has a ...

*May 21, 2014*

**Algebra**

The table below represents the function f(x). (-6, 12),(-5,-8),(-4,-4), (-3,0),(-2,4),(-1,8),(0,12). If g(x) is a linear function that has a slope of -3 and a y-intercept of -9, which statement is true? A) The x-intercept of f(x) is less than the x-intercept of g(x). <<&...

*May 21, 2014*

**Cost Accounting**

A company’s sales volume averages 4,000 units per year. Recently, its main competitor reduced the price of its product to $48. The company expects sales to drop dramatically unless it matches the competitor's price. In addition, the current profit per unit must be ...

*May 20, 2014*

**Chemistry**

When 155 mL of water at 26 degrees Celsius is mixed with 75 mL of water at 95 degrees Celsius, what is the final temperature of the mixture? (d Water = 1.00 g/mL) Im really stuck on this problem and chemistry isnt exactly my strong point, thanks in advance!

*May 19, 2014*

**physicss**

a point charge -q, mass m is flying up at the speed v(0)= v 0 from the distance x(0)=L from a uniformly and positively charged thin plate, its linear density equal p. determine the maximum distance of a particle from the plate

*May 19, 2014*

**Physics**

a point charge -q, mass m is flying up at the speed v(0)= v 0 from the distance x(0)=L from a uniformly and positively charged thin plate, its linear density equal p. determine the maximum distance of a particle from the plate

*May 19, 2014*

**Astronomy**

v = c*sqrt(1-4/a) a = 4/θ^2 θ = sqrt(4/a) inverse formula sqrt(1-v/c^2), so in this case. v = c*sqrt(1-4/a)

*May 11, 2014*

**algebra**

Let f(x)= 2x^2 +7 and g(x)= x – 6. (a) Find the composite function (f*g)(x) and simplify. Show work. (b) Find ( f*g)(1). Show work.

*May 9, 2014*

**Pre algebra**

A cyclist rides her bike at a speed of kilometers per hour. What is this speed in kilometers per minute? How many kilometers will the cyclist travel in minutes? Do not round your answers.

*April 26, 2014*

**algebra**

when P dollars is invested at interest rate (I), compounded annually, for (t) years, the investment grows to (A) dollars, where A=P(1+I)^3. Find the interest rate if $40,960 grows to $49,130 in 3 yrs.

*April 22, 2014*

**Maths**

Fred is 10 yrs older than Ted. In 3 yrs time Fred will be 3 times as old as Ted. Let Fred be x yrs old now. Write an equation to represent this situation. Solve equation and state how old each person is now.

*April 20, 2014*

**Geometry**

tha area of a regular octagon found by decomposing the octagon into a rectangle into trapezoids is ________ m2

*April 10, 2014*

**chemistry**

I want to make sure I am correct in classifying whether the following properties of hydrogen are chemical or physical. thanks 1. hydrogen will burN in in oxygen to form water. CHEMICAL 2. hydrogen does not support combustion. CHEMICAL 3.hydrogen is usually found combined with ...

*April 8, 2014*

**Chemistry**

I am not sure if I understand how to balance this correctly. I need to write a balanced equation for the decomposition of solid copper(ii) sulfate to form gaseous sulfur trioxide and solid copper (ii) oxide. 2CuSO7 = CuSO4 + SO3 + CuO

*April 8, 2014*

**Chemistry**

Could someone please let me know if I have the answer to the following question correct? If my answer is incorrect could you please help me answer this question. what is the difference between 3M and 9M of sulfuric acid? I think the difference is that there are 3 moles of ...

*April 7, 2014*

**math**

A piece of rope is in the shape of a 12ft. by 16ft. rectangle. The same rope is then shaped into a square. What is the area of square?

*March 30, 2014*

**Physic Angular momentum and torque**

What is the angular momentum of a 1.0kg uniform cylindrical grinding wheel of radius 19cm when rotating at 1700rpm ?How much torque is required to stop it in 4.6s ?

*March 29, 2014*

**Physic Moment of inertia**

Determine the moment of inertia of a 11.1kg sphere of radius 0.794m when the axis of rotation is through its center.

*March 29, 2014*

**Algebra**

Graph the solution to the inequality on the number line |4u-8|=>12

*March 25, 2014*

**Chemistry**

10.1/50= 0.202

*March 25, 2014*

**physics**

The micrometer (1 μm) is often called the micron. (a) How many microns make up 1.5 km? (b) How many centimeters equal 1.5 μm? (c) How many microns are in 1.5 yd?

*March 23, 2014*

**algebra**

A box of candy contains two types of chocolates. One type is made with nuts, and the other type is nut free. The box contains 3 times more candies with nuts than candies without nuts. Johnny pulls a candy out of the box at random. What is the probability that Johnny pulled out...

*March 20, 2014*

**chemistry**

Combustion analysis of a hydrocarbon produced 33.01 g {\rm CO}_2 and 27.04 g {\rm H}_2{\rm O}. Calculate the empirical formula of the hydrocarbon. Express your answer as a chemical formula.

*March 17, 2014*

**Chemistry Urgent**

Calculate the DHof for the following reaction under standard state conditions: 2 Ag2S(s) + 2 H2O(l) ---> 4 Ag(s) + 2 H2S(g) + O2(g) Given the following information: Ag2S(s) ÄHof = -32.6 kJ/mol H2O(l) Ä Hof = -285.83 kJ/mol H2S(g) ÄHof = -20.6 kJ/mol

*March 9, 2014*

**Chemistry Urgent**

Consider the following problem: Target: 2NOCl(g) ? N2(g)+ O2(g)+Cl2 (g) ?Hrxn= ? Steps: 1. 1/2 N2(g) + 1/2 O2(g)? NO(g) ?H= 90.3 kJ 2. NO(g) + 1/2 Cl2(g) ? NOCl(g) ?H= -38.6 kJ As you determine the ¥ÄHrxn value for the target equation above, what must be done to step ...

*March 9, 2014*

**Chemistry**

Consider the following problem: Target: 2NOCl (g) ¡æ N2 (g) + O2 (g) + Cl2 (g) ¥ÄHrxn= ? Steps: 1. ¨ö N2(g) + ¨ö O2(g) ¡æ NO(g) ¥ÄH= 90.3 kJ 2. NO(g) + ¨ö Cl2(g) ¡æ NOCl(g) ¥Ä H= -38.6 ...

*March 9, 2014*

**algebra (solve for y)**

woops there is a 2 in front of the first e&(2y). Proper equation: 0=2e^(2y)-e^(y)

*March 4, 2014*

**algebra (solve for y)**

0=e^(2y)-e^(y) Need to solve for y here, don't understand why answer is -ln(2) in the book. Thanks.

*March 4, 2014*

**poetry part 2**

I think its C.Peace

*March 2, 2014*

**Physics**

No, youa are wrong. It is not mVa = .1m(Va-V) + .9mVb it is mVa = (-).1m(Va+V) + .9mVb it is not 2, it is 20/9

*March 1, 2014*