Tuesday

January 17, 2017
Total # Posts: 185

**Trig **

An isosceles triangle has a height of 12.5 m (measured from the unequal side) and two equal angles that measure 55°. Determine the area of the triangle. Split in half the triangle is a right triangle, so it's three angles are 90%, 55% and 70%. I'm still not sure ...

*January 10, 2017*

**Math--linear systems**

A local hardware store sells three types of boxes; small, medium and large. The cost of the boxes are; small $10, medium $20 and large $30. In the previous week a total of 1200 boxes were sold resulting in proceeds of $20 000 for the week. The number of small boxes sold was ...

*January 6, 2017*

**Math**

Hi Steve, thanks for your reply. Yes, it was a typo and your 2nd assumption was right. Please help, thanks! ?(4x+4)(x^2+2x-3)^(2/3) dx

*January 6, 2017*

**Math**

? (4x+4)(x^2-2x-3)^2/3 dx

*January 6, 2017*

**Trig**

Given: sin x = 4/5, 0 < x < ?/2 sin y = 5/13, ?/2 < y < ? Find the exact value of sin(x + y) I presume I'm supposed to use the sum and difference formulas but I'm not sure how to get the exactly value of cos x or cos y

*January 4, 2017*

**Math**

Consider the following cubic curve: f(x)=?x3 ?x2 +16x+16 1. Calculate f?(x). 2. Calculate f??(x). 3. Find the x values such that f(x) = 0.

*January 2, 2017*

**Math**

Consider the following cubic curve: f(x)=?x3 ?x2 +16x+16 1. Calculate f?(x). 2. Calculate f??(x). 3. Find the x values such that f(x) = 0.

*December 30, 2016*

**Math**

Juliya is 5 years younger than her brother,Tom.how old are they if the product of their ages is 126?

*December 27, 2016*

**calculus**

f(x)=?x3 ?x2 +16x+16 1. Calculate f?(x). 2. Calculate f??(x). 3. Find the x values such that f(x) = 0. Note: this can be done by factoring. 4. Find the stationary point/s. Note: a point requires x and y coordinates. 5. Determine the nature of this/these point/s. 6. Find the ...

*December 20, 2016*

**Math**

Thank you!!!

*December 20, 2016*

**Math**

We want to construct a closed rectangular box whose base has a length three times the width. The surface area has to be 600 cm2. Determine the dimensions of the box that will produce the largest volume.

*December 20, 2016*

**Math**

Thank you so much guys!!! You guys are awesome! I do have a few more other math problems, should I post them online or ask you directly? Thanks again!

*December 20, 2016*

**Math**

Two cars, car X and car Y , start moving from the same point P on a cross intersection. Car X is travelling east and car Y is travelling north. Some time later car X is 60 km east of point P and travelling in an easterly direction at 80 km/h and car Y is 80 km north of point P...

*December 20, 2016*

**chemistry**

A bottle of cabernet sauvignon wine contains 12.5% v/v ethanol. How much ethanol will be present in a dozen 750 mL bottles of this wine?

*November 27, 2016*

**Chemistry**

A student followed the procedure given in the lab exercise to determine the ascorbic acid content in a commercial vitamin C tablet. The students prepared the solution using a 0.460 g vitamin C tablet. The titration required 40.00 mL of the 0.005 M KIO3/KI solution to reach an ...

*November 22, 2016*

**American Government**

1) B 2) D 3) A

*November 17, 2016*

**Math**

How do I evaluate sinx-4 since I can't do arcsin4. How do I interpret that?

*September 21, 2016*

**Math**

Solve (degrees): 3sin^2(x)-11sin(x)-4=0 It's just a quadratic but doesnt wprk?

*September 21, 2016*

**Chemistry**

Aqueous sulfurous acid H2SO3 and aqueous sodium chloride are formed by the reaction of aqueous sodium sulfite Na2SO3 and aqueous hydrochloric acid HCl . Write a balanced chemical equation for this reaction.

*August 19, 2016*

**Analytical Chemistry**

What volume, in liters, of 1.09 M KOH solution should be added to a 0.102 L solution containing 9.35 g of glutamic acid hydrochloride (Glu, FW = 183.59 g/mol; pKa1 = 2.23, pKa2 = 4.42, pKa3 = 9.95) to get to pH 10.26? Should I start with molar concentrations in the beginning (...

*July 5, 2016*

**earth science**

When I bumped the table, the coffee in my cup spilled out. Newton's _____ law explains this reaction. 1st 2nd 3rd

*May 24, 2016*

**Physics**

A circular parallel plate capacitor with plate radius 8.2cm and plate separation .15mm is connected in series with a 16V ideal battery and a 790 ohm resistor at t=0. At time t=2.4e-6 seconds, what is the induced magnetic field that lies along the outer edge of the capacitor? I...

*April 19, 2016*

**Physcs**

A circular parallel plate capacitor with plate radius 8.2cm and plate separation .15mm is connected in series with a 16V ideal battery and a 790 ohm resistor at t=0. At time t=2.4e-6 seconds, what is the induced magnetic field that lies along the outer edge of the capacitor? I...

*April 19, 2016*

**English grammar**

1.This figure is wrong;please strike it-----(fill in with suitable preposition)

*March 29, 2016*

**English grammar**

1.Some of the pie---(is,are)missing. 2.Alof the pies---(is,are)missing. Fill in the blanks with suitable forms of verbs.

*March 27, 2016*

**English grammar**

Thankyou so much for your help..

*March 21, 2016*

**English grammar**

1.Honour or reputation ---(is,are)dearer than life. Which of the two words is the most appropriate?

*March 21, 2016*

**Math**

Thanks!

*March 17, 2016*

**Math**

Is 1.256 rational or irrational? Rational*** Irrational

*March 17, 2016*

**Geometry**

I have a rectangle MNOP ~ rectangle STUV. What is the length of line TU?? First rectangle is MNOP with 10 on top and 4 on the side. Second rectangle is STUV. With the top marked X for the unknown number and n the side is 6. I need help solving this. Do you guys think you can ...

*March 5, 2016*

**Biology**

In the question section of my chapter "Strategies for Enhancement of Food Production" i got d question "What is Quarantine? Give one example of it." I found the what is the quarantine part but didn't get examples... Not even in my book. Plz help !

*February 7, 2016*

**Functions 11**

Find the value(s) of k so that each function has 2, 1, and 0 roots f(x)=kx^2-9x+6 f(x)=3x^2+kx+12 f(x)=9x^2+3x+k I know to use the discriminant but am not sure where to go from there

*January 27, 2016*

**Physics**

How many coulombs pass through a wire that carries a current of 3.2 A for 5.0 h? I=Q/t Q=It Q=3.2*5*60 Q=960 I am told this is not the correct answer.

*January 18, 2016*

**Physics Sound Waves**

A fire truck emitting a 450 Hz signal passes by a stationary detector. The difference in frequency measured by the detector is 58 Hz. If the speed of sound is 345 m/s, how fast is the fire truck moving? The answer should be 22 m/s but I don't even know where to start. ...

*December 16, 2015*

**Simple Interest**

1200

*December 10, 2015*

**Chemistry. I got the wrong answer. Plz help**

Write out your balanced equation for the reaction first. 2Na + Cl2 --> 2NaCl ? 142g 234g Mols of Cl2 142g / 71 g/mole = 2 mol of Cl2 Because of the balanced equation, one mol of Cl2 requires 2 mols of Na for all of the chlorine to be used up ... 4 mol of Na 4 mol * 23 g/mol...

*December 8, 2015*

**Chemistry. Plz Help!**

g/mols is the molar mass of the substance. You can find the molar mass by taking the sum of the atomic masses in the substance.

*December 8, 2015*

**Math**

You know: l = w + 8 P = 54 = 2(w + l) plug w + 8 in to the perimeter equation

*December 8, 2015*

**Physics Energy**

I have come to believe the answer given was wrong after seeing so many other errors in the answers.

*December 8, 2015*

**Physics Energy**

A baseball player puts a baseball on a batting tee. The baseball bat is able to deliver 4.0x10^5 W of power and is in contact with the ball for 0.70 ms and a distance of 1.4 cm. The mass of the ball is 145 g. What is the next force applied to the ball, and what is its average ...

*December 8, 2015*

**Report Citation Style**

I was wondering if someone can identify this citation style: Author. (Date). Doc Title. Title Bar Title. Retrieved ____, 2015 from <URL ADDRESS>.

*December 8, 2015*

**Social Studies (Help!)**

Cause they wanted to be rich to get gold, silver, and slaves for them selfs.

*December 7, 2015*

**Math**

"Half the measure of the angle is 25 more than one third the measure of the complement. Find the angle" I don't understand how to set up and solve this at all.

*September 30, 2015*

**CHEMISTRY**

idk

*September 15, 2015*

**Math**

*300 degrees around the circle

*September 14, 2015*

**Math**

Your school’s marching band is performing at halftime during a football game. In the last formation, the band members form a circle 100 feet wide in the center of the field. You start at a point on the circle 100 feet from the goal line, march 3008 around the circle, and...

*September 14, 2015*

**Maths**

Thank you!

*June 8, 2015*

**Maths**

Standing on top of a slope of 5 degrees, i see the top of a building and an angle of elevation of 35degrees15'. i am 160cm tall and it is 12m from the building base. How tall is the building?

*June 8, 2015*

**Math, statistics**

Problem 1: The PDF of exp(X) (6/6 points) Let X be a random variable with PDF fX. Find the PDF of the random variable Y=eX for each of the following cases: For general fX, when y>0, fY(y)= Solution: f_x(ln(y))/y When fX(x) = {1/3,0,if −2<x≤1,otherwise, we ...

*March 31, 2015*

**math, algebra**

If Will gives Molly $9 dollars he will have the same amount of money as her. If Molly give Will $9, the ratio of money she has to the money will has will be 1:2. How much money does will have in the beginning? Can you give me an explanation of each step, please? I'm having...

*January 28, 2015*

**math**

Thanks, Steve :D

*January 15, 2015*

**math**

Bella spent 4/7 of her money on a dictionary and 3 identical books. She spent 1/6 of the remainder on a journal that cost $7. How much did she spend on the dictionary and 3 books? If 3/8 of the cost of the dictionary was the same as 1/2 of the total cost of 3 books, how much ...

*January 15, 2015*

**physic**

Torque

*December 18, 2014*

**psychology**

Ms. Sue is a nasty piece of work.

*December 15, 2014*

**math**

3/4 of seats in a concert hall were occupied. The ratio of adults to children was 7:3. If 90 more adults attended the concert, the number of adults would be 3 times of number of children. How many seats were in the concert hall?

*November 23, 2014*

**physics**

A bear spies some honey and takes off from rest, accelerating at a rate of 1.9 m/s^2. If the honey is 17m away, How fast will the bear be going when he gets to the honey?

*October 22, 2014*

**chemistry**

How many grams of HCl are formed from reaction of 3.58g of H2 with 8.90g of Cl2?

*October 16, 2014*

**Social Studies**

anonymous as always

*October 9, 2014*

**Chemistry**

A solution of ammonia and water contains 1.60×1025 water molecules and 8.50×1024 ammonia molecules. How many total hydrogen atoms are in this solution?

*October 8, 2014*

**CHEMISTRY**

A sprinter set a high school record in track and field, running 200.0 m in 21.5s . What is the average speed of the sprinter in kilometers per hour?

*October 6, 2014*

**Algebra1**

How to do work out C+4=-24

*September 2, 2014*

**Chemistry**

What is the formula of the compound formed between the ions CO32- and Ni2+

*June 1, 2014*

**Math**

Group C ate 4/6 of a pizza, or 2/3. Checks out: Grp A = 6/6 (1 pizza); Grp B = 8/6 (1 1/3 pizzas); Grp C = 2/3 of a pizza. The info provided means we can solve for the portions of pizzas consumed, but not in "units" of slices. Check by adding up the fractions: 18/6 = 3.

*April 24, 2014*

**6th Grade Math**

Aiden has 7/10 cup cereal, 2 2/3 cups pretzels, 1/6 cup raisins and 2/5 cup chocolate chips to make a party mix. How much party mix will he have in all if he uses all the ingredients he has?

*April 13, 2014*

**Calc**

Let F(x, y, z) = z tan−1(y^2)i + z^3 ln(x^2 + 10)j + zk. Find the flux of F across S, the part of the paraboloid x^2 + y^2 + z = 19 that lies above the plane z = 3 and is oriented upward. Thanks! STudying for a quiz... *tan−1 is tan^(-1)

*November 10, 2013*

**Math**

20+40=60

*October 9, 2013*

**math**

Let V be the volume of the solid that lies under the graph of f(x,y)= (52 − x^2 − y^2)^1/2 and above the rectangle given by 4 ≤ x ≤ 6, 0 ≤ y ≤ 4. We use the lines x = 5 and y = 2 to divide R into subrectangles. Let L and U be the Riemann ...

*September 14, 2013*

**ECON**

For your twenty-first birthday, your grandfather offers you a gift of $1000 today. However you have the choice of waiting 3 years and receiving $1500 or waiting 5 years and receiving $3000. If your money grows at a rate of 8 percent compounded annually, which alternative ...

*September 7, 2013*

**STATISTICS**

0.05

*August 6, 2013*

**physics**

I still can't believe Marshawn Lynch didn't run the ball

*June 30, 2013*

**math**

how do i find the measure of central angle rounded to the nearest degree then showing using graphs and degrees

*May 10, 2013*

**Physics**

Consider the stability of a ladder of mass m and length L leaning against a wall. A painter wants to be sure the ladder will not slip across the floor. He knows that the frictional force exerted by the floor on the bottom end of the ladder is needed to keep the ladder in ...

*May 8, 2013*

**Physics**

^^ That is incorrect

*May 8, 2013*

**Physics**

The sled is stuck in the snow. A child pulls on the rope and finds that the sled just barely begins to move when he pulls with a force of 24 N, with the rope at an angle of θ = 33° with respect to the horizontal. The mass of the sled is 14 kg. If the child continues ...

*May 8, 2013*

**Physics**

The roller coaster starts with a velocity of 16 m/s. One of the riders is a small girl of mass 26 kg. Find her apparent weight when the roller coaster is at locations B and C. At these two locations, the track is circular, with the radii of curvature given. rB = 10 m, rC = 20 ...

*May 8, 2013*

**PHYSICS**

A truck has a momentum of 5.8x10^4 Ns [S]. An average force of 2.2x10^3 N [S] increases the truck's momentum for the next 8.8s. What is the impulse and final speed of the truck?

*April 5, 2013*

**PHYSICS**

Max is throwing a 57g tennis ball upward and hitting it (with a racket) when it reaches the top of its flight. If the racket exerts an average force of 440N on the ball, find the speed of the ball after the collision (if they are in contact for 4.5ms)

*April 5, 2013*

**PHYSICS**

A baseball of mass 148g is travelling at 35.0m/s [E] collides with a baseball bat. the collision lasts for 1.10ms. After the collision, the baseball travels at 52m/s [W]. What is the force of the bat on the baseball

*April 5, 2013*

**physics**

An apple (m = 125g) is attached to a vertical spring (from a ceiling) that has a k value of 55 N/m. The apple is held up so the spring is un-stretched. When the apple is released, a) how far will the spring stretch? b) How fast will it be going when it has fallen 4.0cm?

*March 28, 2013*

**physics**

A horizontal spring with k = 45 N/m is attaches a 1.0kg block to a spring hung from the ceiling. A block is pulled down to a spot that is 30.0cm from the spring's rest position. What is it's new acceleration?

*March 28, 2013*

**physics**

A compact car can achieve a maximum acceleration of 3.2 m/s^2. If dice were hanging from the rearview mirror, what angle would they swing on?

*March 24, 2013*

**physics**

A small marble is suspended from a 45 cm string and creates a conical pendulum (like in the picture beside question #57). The marble revolves at constant speed in a horizontal circle with a 6.5 cm radius. Calculate the marble's velocity along the circle.

*March 23, 2013*

**physics**

A ball of mass 0.750 kg is attached to the end of a 1.20m long cord that can withstand a maximum tension of 50.0 N. If swung in a vertical circle, what is the maximum velocity the ball can achieve before the string breaks?

*March 23, 2013*

**Math**

Put two in opposite corners, then two on each side. The corners ones touch two sides....resulting in three marbles on each side.

*February 18, 2013*

**Science**

Use the following values for mass and charge: an electron has mass me = 9.11×10-31 kg and charge -e, a proton has mass mp = 1.67×10-27 kg and charge +e, an alpha particle has mass malpha = 6.65×10-27 kg and charge +2e, where e = 1.60×10-19 C. An ...

*February 6, 2013*

**Science**

Use the following values for mass and charge: an electron has mass me = 9.11×10-31 kg and charge -e, a proton has mass mp = 1.67×10-27 kg and charge +e, an alpha particle has mass malpha = 6.65×10-27 kg and charge +2e, where e = 1.60×10-19 C. An ...

*February 6, 2013*

**math**

What

*January 1, 2013*

**french**

how to make "nous allons en classe pendant le week-end" negative

*December 4, 2012*

**Physics**

An electrical generating plant operates at a boiler temperature of 220 deg C and exhausts the unused heat into a nearby river at 18 deg C. what is the maximum theoretical efficiency of the plant?

*November 19, 2012*

**Physics**

Would the answer be B because the temperatures are denoted in deg C? 556K - 273 = 283 deg C.

*November 19, 2012*

**Physics**

A pond with a flat bottom has a surface area of 820 m^2 and a depth of 2.0m. on a warm day, the surface water is a temperature of 25 deg C, while the bottom of the pond is at 12 deg C. Find the rate at which energy is transferred by conduction from the surface to the bottom of...

*November 18, 2012*

**Physics**

A student drops two metallic objects into a 120 g steel container holding 150 g of water at 25°C. One object is a 200 g cube of copper that is initially at 85°C, and the other is a chunk of aluminum that is initially at 5°C. To the surprise of the student, the ...

*November 18, 2012*

**Physics**

How long would it take a 1.00 x 10^3 W heating element to melt 2.00kg of ice at -20 deg C, assuming all energy is absorbed by the ice?

*November 17, 2012*

**Physics**

How long would it take a 1.00 x 10^3 W heating element to melt 2.00kg of ice at -20 deg C, assuming all energy is absorbed by the ice?

*November 16, 2012*

**Chinese**

This character is ma (neutral), correct? Thank you. 吗

*August 29, 2012*

**Algebra 1**

You're welcome! Sorry I couldn't explain it to you better earlier.

*August 29, 2012*

**Algebra 1**

*put

*August 29, 2012*