Tuesday

July 28, 2015

July 28, 2015

Total # Posts: 95

**Algebra**

Find the largest three-digit number that can be written in the form 3^m + 2^n, where m and n are positive integers.
*June 25, 2015*

**Algebra**

The Smith family has 13 children, all born exactly 2 years apart. How old will the second-youngest child be when the oldest child is five times the age of the youngest child?
*June 25, 2015*

**Algebra**

Eight U.S. coins are worth a total of 38 cents. How many of the coins are dimes?
*June 25, 2015*

**Algebra**

Tom took five math tests and got an integer score on each of them. He never scored higher than 90, and his lowest score was the fourth test. If his average score, rounded to the nearest integer, was 82, what is the lowest possible score he could have gotten on the fourth test?
*June 25, 2015*

**Algebra**

A car gets 30 miles per gallon of gas and is driven 1000 miles per month. Gas costs $4 per gallon. How much will the car's owner save on gas expenses in one year by buying a new car that goes 50 miles for each gallon of gas?
*June 25, 2015*

**Algebra**

The Mathletes won 2 of their first 10 meets. They went on to win all their remaining meets and finished the year with an equal number of wins and losses. What is the total number of meets in which the Mathletes competed?
*June 25, 2015*

**Algebra**

Answer please!!!
*June 24, 2015*

**Algebra**

For what real values of a is x^2 + ax + 25 the square of a binomial? If you find more than one, then list your values in increasing order, separated by commas.
*June 24, 2015*

**Algebra**

Pleeease answer my question Damon!
*June 23, 2015*

**Algebra**

Damon, that is against the rules!
*June 23, 2015*

**Algebra**

What?
*June 23, 2015*

**Algebra**

For what real values of a is x^2 + ax + 25 the square of a binomial? If you find more than one, then list your values in increasing order, separated by commas.
*June 23, 2015*

**Algebra**

For what real values of c is 9x^2 + 16x + c the square of a binomial? If you find more than one, then list your values in increasing order, separated by commas.
*June 23, 2015*

**Algebra**

The roots of the quadratic equation z^2 + az + b = 0 are 2 - 3i and 2 + 3i. What is a + b?
*June 23, 2015*

**Algebra**

Please convert that to an interval!
*June 23, 2015*

**Algebra**

For what real values of a does the quadratic 4x^2 + ax + 25 have nonreal roots? Give your answer as an interval.
*June 23, 2015*

**Algebra**

the bar is the complex conjugate
*June 18, 2015*

**Algebra**

Find all complex numbers $z$ such that \[ |z|^2-2\bar z+iz=2i. \]
*June 18, 2015*

**Algebra**

Yes
*June 16, 2015*

**Algebra**

Is the answer 56?
*June 16, 2015*

**Algebra**

what is the answer?
*June 16, 2015*

**Algebra**

What constant must we place in the blank below in order to be able to factor the resulting expression into the product of two linear factors: 2mn - 16m - 7n + ____
*June 16, 2015*

**Algebra**

are you sure? I need the actual answer.
*June 16, 2015*

**Algebra**

For what real number k does the product (25 + ki)*(3+2i) equal a real number?
*June 16, 2015*

**Math**

2=6, 3=12, 4=20, 5=30, 6=42, 7=56, 8=72, 9=90. 90 is your answer.
*June 11, 2015*

**Algebra**

please continue
*June 11, 2015*

**Algebra**

A number is called a perfect square if it is the square of an integer. How many pairs of perfect squares differ by 495? (Order does not matter. So, the pair "16 and 9" is the same as "9 and 16".)
*June 11, 2015*

**Algebra**

Let r and s be the roots of y^2 - 19y + 7. Find (r-2)*(s-2).
*June 11, 2015*

**Algebra**

A monic quadratic is a quadratic in which the coefficient of the quadratic term is 1. For example, r^2 - 3r + 7 is a monic quadratic, but 3t^2 - 3t + 1 is not. A teacher writes a monic quadratic on the board. Joanie copies the quadratic onto her paper, but writes down the ...
*June 4, 2015*

**Algebra**

A monic quadratic is a quadratic in which the coefficient of the quadratic term is 1. For example, r^2 - 3r + 7 is a monic quadratic, but 3t^2 - 3t + 1 is not. A teacher writes a monic quadratic on the board. Joanie copies the quadratic onto her paper, but writes down the ...
*June 3, 2015*

**Algebra**

it is wrong!
*June 3, 2015*

**Algebra**

A monic quadratic is a quadratic in which the coefficient of the quadratic term is 1. For example, r^2 - 3r + 7 is a monic quadratic, but 3t^2 - 3t + 1 is not. A teacher writes a monic quadratic on the board. Joanie copies the quadratic onto her paper, but writes down the ...
*June 3, 2015*

**Algebra**

The surface area of a box is 160. The length of the box is twice its width as well as 4 less than its height. How many units are in the height of the box? (The surface area of a box is the sum of the areas of all 6 of its rectangular faces.)
*June 3, 2015*

**Algebra**

Given that -3 <= 7x + 2y <= 3 and -4 <= y - x <= 4, what is the maximum possible value of x + y?
*May 28, 2015*

**Algebra**

At the end of Week 5 of my basketball team's season, our record is 3 wins and 17 losses. Each week after that, we win 3 games and lose 1 game. At the end of which week will my team have won at least 65% of its games total for the first time in the season?
*May 27, 2015*

**XXX**

At the end of Week 5 of my basketball team's season, our record is 3 wins and 17 losses. Each week after that, we win 3 games and lose 1 game. At the end of which week will my team have won at least 65% of its games total for the first time in the season?
*May 26, 2015*

**Algebra**

Find B - A if the graph of Ax + By = 7 passes through (2,1) and is parallel to the graph of 2x - 7y = 3.
*May 21, 2015*

**XD**

In a 24 km race, during which each runner maintains a constant speed throughout, Alice crosses the finish line while Becky is still 8 km from finishing and Caitlin is 12 km from finishing. When Becky crosses the finish line, Caitlin still has d kilometers to go. Find all ...
*May 6, 2015*

**XD**

Sorry, but that is incorrect. :(
*May 6, 2015*

**XD**

James, Karen, and Lou are hiking. Lou forgot to bring any water. James brought 2 gallons of water and Karen brought 1 3/4 gallons of water. The three of them agree to divide all the water equally among them. Lou gives $2 for the water he receives, which James and Karen agree ...
*May 6, 2015*

**chem help**

DrBob222...I would assume if people KNEW how to answer a question they would NOT have to seek help on this site. always xxx
*April 19, 2015*

**Maths Probability**

2) 0.5
*May 20, 2014*

**Maths Probability**

1)3/32 correct 2)0.5 correct 3)1/3 incorrect 4)20/3 incorrect 5
*May 15, 2014*

**Chemistry**

10ml 15% HCl + 5g NaHCO3 = NaCl + CO2 + H2O. How much CO2 [L]
*November 4, 2013*

**Chemistry**

Bunch of cheaters who can not respect the code of honor... LOL.
*December 15, 2012*

**Chemistry**

184 hours = 7.6 days ==> 1 week? The steel industry will collapse if this is the answer. LOL! Just by seeing the figure one can tell this does not make sense.
*December 15, 2012*

**Chemistry**

Yawnnnn. What a kind-hearted person you are Odesa I am touched by your way of cheating and helping each other. LOL.
*December 15, 2012*

**CHEMISTRY**

Let's play around! Go GO Go!!! FIre in you hole!
*December 15, 2012*

**CHEMISTRY**

Funny enough to be bere and say f.u.ck off b1tches and as.s.holes!!!
*December 14, 2012*

**chemistry**

No one will kick them out of the course, who can detect them via this Jishka website? They already done the disgraceful deeds by their own, that will be their punishment. LOL.
*December 14, 2012*

**chemistry**

Pity MIT staffs that record all of the lecture videos and preparing all the study material if the exam will be like this way... Just for the sake of f.uc.k.ing certificate...
*December 14, 2012*

**chemistry**

Odesa, like to help each other to cheat because he/she like to be cheated... Hahaha
*December 14, 2012*

**Chemistry**

Please discuss how you arrived at that -2.295 figure rather than directly give that answer. If all of you just wanted that f.uc.k.ing certificate without understanding the material, then what you will get is only certificate not the knowledge and experience...
*December 13, 2012*

**Chemistry**

The formula and explanation are given in the lecture video S23V2, in this case what you need to be cautious is the Z, Pt and Au are FCC structure, hence you need to draw the unit cell and its surrounding unit cell to get the idea of the coordination number.
*December 11, 2012*

**Chemistry**

Please discuss how you arrived at that -2.295 figure rather than directly give that answer. If all of you just wanted that f.uc.k.ing certificate without understanding the material, then what you will get is only certificate not the knowledge and experience...
*December 11, 2012*

**Chemistry**

Why posting the question that only need High School grade to answer? Are you Junior High School student or lower grade? If you have no intention to put some effort in your study from the start, no need to enroll and then cheat.
*November 18, 2012*

**chemistry**

Why posting the question that only need High School grade to answer? Are you Junior High School student or lower grade? If you have no intention to put some effort in your study from the start, no need to enroll and then cheat.
*November 18, 2012*

**Science**

Why posting the question that only need High School grade to answer? Are you Junior High School student or lower grade? If you have no intention to put some effort in your study from the start, no need to enroll and then cheat.
*November 18, 2012*

**Chemistry :(**

Why posting the question that only need High School grade to answer? Are you Junior High School student or lower grade? If you have no intention to put some effort in your study from the start, no need to enroll and then cheat.
*November 18, 2012*

**physics**

A 28.0 block is connected to an empty 2.20 bucket by a cord running over a frictionless pulley. The coefficient of static friction between the table and the block is 0.44 and the coefficient of kinetic friction between the table and the block is 0.35. Sand is gradually added ...
*October 31, 2011*

**College Chemistry**

u dr bob, explain further dunt just say NO, ok
*May 5, 2010*

**science**

Both the terms Aves and Neornithes apply to birds. Hope this helps.
*May 9, 2009*

**Science [Earth]**

Can you please: 1. briefly explain the concept of radioactive decay and describe how it can be used to find the absolute age of rocks. 2. contrast relative age with absolute age and describe at least three methods of determining either. 3. compare advantages and disadvantages ...
*May 8, 2009*

**cultural studies - world history**

Hey. I have to write about Mayan and Aztec civilization. Well, first of all, it has to be a diary, as if I'm going back in time and visiting those two civilizations. Basically, it's like I'm visiting Mesoamerica and I have to write down a diary entry on what I see...
*May 8, 2009*

**Math**

An example of a math expression is: 2x+3x-4 No, you can't solve for a variable in an expression. Still, you can simplify it. For example: <2x + 3> is an expression , it does not prompt you for an answer because it is not a "complete" thought. Since it is ...
*May 5, 2009*

**ks3 history**

Yup, March 25th, 1807. You're right..
*May 3, 2009*

**math (graphing)**

okayyy.. what about "y < -2" ????
*May 3, 2009*

**math (graphing)**

Thank you VERY much! You're my savior :) just one more question.. I NOW understood how to graph equations.. but I still have to graph inequalities, which seems much more complicated from my point of view. I've got two inequalities that I have to graph. 1. y > 2/3x-4...
*May 3, 2009*

**math (graphing)**

I need to graph "y = -2x+5" and "y = 4/5x-3"... I don't think it's possible to help graphing on this site.. so can you please tell me any other sites where it would show how to graph those equations? also, I'm having trouble graphing ...
*May 3, 2009*

**math**

I think I got it right for number 2. My answer is "x=-3" and "y=9". But I'm confused with number 1, 'cause there is no X. :/
*May 3, 2009*

**math**

Find intercepts of the graph of the equation. 1. y = -6 2. y = 3x+9
*May 3, 2009*

**math**

for number 1, I got "-10/-7" and for number 2, "4/-2" are these correct? also, for number 2 [4,-2], I don't have to simplify, right? thanks..
*May 3, 2009*

**math**

Find the slope of the line passing through the points. 1. (5,7), (-2,-3) 2. (6,3), (4,7) ..thanks
*May 3, 2009*

**Science**

1. They are more expensive than ground based telescopes and either a lot more difficult or simply impossible to repair or update. Also, they are vulnerable to various forms of damaging radiation and meteors. (I suppose the ground equivalent would be earthquakes and forest ...
*May 3, 2009*

**math**

1. The x-intercept of a line is -3. The y-intercept of a line is 6. What is the slope of the line? 2. What is the equation in slope-intercept form of the line described in Exercise 1? can you please explain and answer it?? im having lots of trouble with this. it's urgent...
*May 3, 2009*

**calculus**

lol whatever it is. thanks =)
*April 30, 2009*

**calculus**

Every month, a girl gets allowance. Assume last year she had no money, and kept it up to now. Then she spends 1/2 of her money on clothes, then 1/3 of the remaining money on games, and then 1/4 of the remaining money on toys. After she bought all of that, she had $7777 left. ...
*April 30, 2009*

**calculus**

1. One day, a person went to horse racing area, Instead of counting the number of human and horses, he instead counted 74 heads and 196 legs. Yet he knew the number of humans and horses there. How did he do it, and how many humans and horses are there? im stuck.. please help
*April 30, 2009*

**algebra**

sorry, this is the right way: 6x+8y=24, 8y(-6x)=2 also, there is another question I'm having trouble with. subject is Calculus. 1. One day, a person went to horse racing area, Instead of counting the number of human and horses, he instead counted 74 heads and 196 legs. Yet...
*April 30, 2009*

**algebra**

6x+8y=24, 8y-6x=2 what is x and what is y? urgent! thanks:)
*April 30, 2009*

**math**

Okay. Thanks a lot!
*April 29, 2009*

**math**

So then what's the equation in slope-intercept?
*April 29, 2009*

**math**

typing mistakes: 1. What IS the slope... 2. ...line described...
*April 29, 2009*

**math**

1. The x-intercept of the line is -3. The y-intercept of the line is 6. What us the slope of the line? 2. What is the equation in slope-intercept form of the linedescribed in Exercise 1?
*April 29, 2009*

**math**

The roof of a fence rises 3 feet vetically, for every 5 feet it runs horizontally. What is the slope of the roof? It's the second time I'm posting this question and the first time I got an answer: 60%. [3/5] Is it right?
*April 29, 2009*

**social studies**

Because during this period of time many achievements are made in science, literature, music, mathematics, etc. in Gupta Empire.
*April 23, 2009*

**algebra 2**

With 10 students you have 10 choices for the first student to go, then 9 choices for the second student to go. That would seem to be 90 ways to choose the people to go on the trip. But the order doesn't matter. You don't care if Alice is chosen, then Bob, or vice versa...
*April 23, 2009*

**math**

thank you =)
*April 23, 2009*

**math**

tell whether the ordered pair is a solution of the equation y=-4x+3 1. (-2, -5) 2. (3, -9) 3. (1/2, 1) my answers: 1. no, 2. no, 3. no but I don't think they're right... can you please check??
*April 23, 2009*

**math**

thank you very much =)
*April 23, 2009*

**math**

BTW, I meant, "write a function rule that relates the input X and output Y" =)
*April 23, 2009*

**math**

write a function rule the relates the inout X and output Y: (0,1), (1,4), (2,7), (3,10) please help! I can't get this one..
*April 23, 2009*

**math**

let me guess.. 560 gallons of water each day!
*April 22, 2009*

**math**

there are 18 students in a class, and only 6 of them are girls. which means: 6/18. you simplify it and get 1/3. and that's your probability
*April 22, 2009*

**science**

What is necessary for a wave to form or what? I wish you would expend your question a bit. Your answer could probably be that for a wave to form wind needs to blow across the water's surface, transmitting their energy to water. From there a wave forms, getting larger as it...
*April 22, 2009*

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