| Subject | Date Asked |
|
| math | 1/9/2008 |
Q: I NEED HELP WITH SUBSTITUTION...... THIS IS MY PROBLEM.... x+y=15 3x+4.5y=35
A: To solve by substitution, solve for x in the first equation: x+y=15 Subtract y from both sides: ...
|
| Density | 12/14/2007 |
Q: I'm not to informed on the procedure of how to solve the eqation "find the density of a material ...
A: To solve this, you need to know that density (d) is equal to mass (m) divided by volume (v), or ...
|
| Compound Interest | 12/11/2007 |
Q: What is the formula to calculate Compound Interest?
A: This website has both the formula and an example (and they are both correct): ...
|
| Algebra | 11/28/2007 |
Q: Could u please help me. Ive had several attempts and keep getting 6-6x-3x². Help Please. Asap. show ...
A: I worked this out and got the correct answer. It's likely that you're having trouble multiplying the ...
|
| math equation | 10/15/2007 |
Q: A chemist has 84 ozs. of a solution. He pours the solution into test tubes each hold 2/3 oz. How ...
A: This question isn't so bad. What we need to do is write an equation. Let's let x equal the number of ...
|
| math | 9/21/2007 |
Q: how many cans each with a capacity of 3/8 gallon can be filled from 2 barrels of oil each containing ...
A: Let's make an equation here. Let x equal the number of 3/8 gallon cans. We can write the following ...
|
| Help with substitution | 9/16/2007 |
Q: F=1.8C+32 F=C Thank you!
A: If F=C, then we can just replace the C in the first equation with F and solve: F=1.8F+32 Subtract ...
|
| algebra | 9/15/2007 |
Q: i have never done these sorts of problems before so i keep getting them wrong! could you please ...
A: Here's what's going on. We're multiplying two things together here, x, and some number (x-4), and ...
|
| Conversion | 9/5/2007 |
Q: 5 miles/hour is equivalent to how many feet/second? Meters/second?
A: To do a conversion problem, it's easiest to multiply what you've got by a series of unit conversions ...
|
| Equations | 9/4/2007 |
Q: 3(2x+5)=39
A: First, distribute the three over the parentheses: 6x+15=39 Now, subtract 15 from both sides: ...
|
| Math | 9/4/2007 |
Q: I am having difficulty with finding the least common denominators, one of my problems is Write ...
A: Least common denominators aren't so bad. All you need to do is find the lowest number that is a ...
|
| linear equation college algebra help | 9/3/2007 |
Q: I can't figure out what the x's are , either 0 or 1 ?, or there's no x, because x divided by x is 1, ...
A: Let's start by converting .5 to a fraction, which ends up being 1/2. Now we have fractions for ...
|
| centimeter word problem | 8/30/2007 |
Q: My son and I are working on his math worksheet (5th grade), and one of the questions is: last ...
A: Nope! This isn't a trick question. Since all of the measurements are in the same units ...
|
| College Algebra | 8/26/2007 |
Q: The math problem is if you invested a total of $7,000.00 dollars into two accounts one paying 6% and ...
A: To solve this easily, we need to use two equations. First, let's define some variables...let x equal ...
|
| miles in a minute (latitude around earth) | 8/23/2007 |
Q: There are 360 degrees of latitude around the earth. Each degree is divided into 60 minutes. Each ...
A: You've almost got your question answered in the way you ask it. We know how many miles there are per ...
|
| Rates | 8/18/2007 |
Q: Have I determined the correct answer to the following question? Ten workers perform a job in 5 ...
A: Over the course of this weekend, I've asked several friends and colleagues for input on how to best ...
|
| Algebra | 8/16/2007 |
Q: How would I find the answer to a problem like so; Solve for d2: A= 1/2 d1 d2. I would appreciate an ...
A: To solve for d2 here, the idea is that we have to get it alone. The first thing I'd do is multiply ...
|
| Rates | 8/15/2007 |
Q: Have I determined the correct answer to the following question? Ten workers perform a job in 5 ...
A: You are perfectly correct here. If you're interested, here's another way to look at the problem: If ...
|
| Definition | 8/10/2007 |
Q: Can you please explain the difference between a function and a relation? I never seem to get it ...
A: Here's a couple of tricks I use to remember the differences between functions and relations: 1) All ...
|
| Percentages | 8/8/2007 |
Q: 75 is what percent of 90?
A: B., To solve this problem, let's set up a proportion. 75/90 = x/100 So, what this equation is ...
|
| need to brush up | 8/7/2007 |
Q: i have a four sided figure that i need to find the area of. well, actually it's a lawn. but the ...
A: I've got some good news and some bad news. If this is a real lawn, all you need to do is measure a ...
|
| rate distance and time | 8/6/2007 |
Q: how do you convert the decimal into minutes and seconds? ex.8.55 hours. Traveling 600 miles at 70 ...
A: If you want to convert 8.55 hours into minutes and seconds, we need to set up a proportion. Since ...
|
| math | 8/1/2007 |
Q: when a piece of a circle is determined by two radii, that piece is best called a ...
A: The piece of a circle determined by two radii would best be called a sector. A sector is the area ...
|
| improper fractions | 7/29/2007 |
Q: how do I change 3 2/5 to an improper fraction?
A: To change this into an improper fraction, you need to figure out how many fifths the whole number ...
|
| problem in multiples | 7/28/2007 |
Q: Sam must choose a number between 67 and 113 that is a multiple of 4 , 5 ,10 and . what are ...
A: Here's how I solved the problem. First of all, the multiples of 10 are easy to pick out. They are: ...
|
| math question | 7/27/2007 |
Q: How will the knowledge of factoring help in your career? (criminal justice)
A: What a neat question! I'm not sure if you're talking about factoring numbers or expressions, but it ...
|
| Logarithms | 7/25/2007 |
Q: Please help! y=ln(x-2) Solve for x
A: We'll begin this problem by applying the exponential function (e) on both sides of the equation. ...
|
| basic math | 7/24/2007 |
Q: problem statement=a copy machine makes 21 copies per minute how long does it take to make 91 copies? ...
A: Let's start by making a proportion. (21/1)=(91/x) Now we cross multiply, which means we multiply ...
|
| ratios | 7/24/2007 |
Q: In her morning class, the computer teacher has 20 students, 8 of whom are women and 12 of whom are ...
A: Let's start by looking at the ratio of women to men in the morning class. We have 8 women to 12 men, ...
|
| maths subject | 7/16/2007 |
Q: I am trying to find out the name of a particular mathematics subject. But I do not know what it is ...
A: The area of mathematics you're looking for is Combinatorics, which is literally the science of ...
|
| Rates | 7/14/2007 |
Q: If two water pipes are 3 feet long, but one of them has a 1 foot diameter and the second one has a 1 ...
A: What you can do is skip the volume part. I included that because I thought the whole thing would be ...
|
| Rates | 7/13/2007 |
Q: If two water pipes are 3 feet long, but one of them has a 1 foot diameter and the second one has a 1 ...
A: Here's what I did. I measured the volume of each pipe, treating each as a cylinder. The formula for ...
|
| know final price, need original price after 2 discounts | 7/13/2007 |
Q: A pair of glasses is on sale for a 10% discount, an employee is entitled to a 15% discount off the ...
A: No worries! This problem isn't as tough as it looks. Let's start with the second, employee ...
|
| calc | 7/13/2007 |
Q: Explain why a curve that is symmetric about the x-axis is not the graph of a function, unless the ...
A: First, picture the coordinate grid. The x-axis is horizontal, and the y-axis is vertical. To be ...
|
