The Purplemath Forums

I need to find the numbers for each letter in "THINK + RETHINK = REFLECT". Bear in mind that there may be more than one solution, as some numbers may swap places without affecting any other numbers. This can occur when you have two sets of adjacent (side-by-side) columns that behave the s...

If I times the second one by 3, I get 81 normal hours and 9 overtime hours for $189. This is 60 more normal hours and $120 more dollars, for $2 for each normal hour. Working backwards, I get 69 - 21*2 = 27, so each overtime hour is $3. This answer works, but it seems too easy. Am I doing this wrong...

This site has lots of useful information on how to solve such problems in the Beginning Algebra Topics section. In particular, Solving Linear Equations Slope of a Straight Line Slope and y-intercept Intercepts Have a read through those and hopefully things will be a little clearer. DAiv

(20)(2x)+(10)(3x)+(1x) 30+6x=285 How did you arrive at "30 + 6x" from "40x + 30x + 1x"? . . . . . Simplifying with Parentheses Please reply with the steps between your two quoted lines above. Thank you! :D Eliz. I hope I'm not stepping on any toes, but I think I can see what has...

I derive half the fun of answering some questions from working out what the original question actually was. :wink: I think there must have been two graphs, entitled "Enzyme Activity as a Function of Time". Equation A was "k = y/x", and Equation B was something else, perhaps "...

Q1. Given the following equation, 3x – 6y = 18; solve for y. Looks good and the working is well laid out and easy to follow. :D Be careful, though, when writing variables to make sure that if you start with a lower case variable, it remains lower case throughout. For example, y does not become Y, s...

Find the limit, as x approaches infinity, of (1+(2/x)) x This is a problem from Temple University's 'Calculus on the Web' site, I am trying to get re-acquainted with first-semester Calculus as I will begin taking Calc II in a month from now. I can't think of how to bring that x down. Logs? Do you n...

jimmy_boots wrote:2 divided by infinity goes to 0. 1 plus 0 is one. One raised to infinity is an indeterminate form, hence my wish to change the nature of the exponent x.

DAiv

That's not helping me dave. It looks good intuitively but 1 is not a valid answer. I repeat, one raised to infinity is considered an indeterminate form. You're right, it's not a simple solution. Q. Find \lim_{x\to\infty}\left(1+\frac2x\right)^x There are at least two ways of solving this, a...

alejandra wrote:please help me i dont know how to do this

-9x-4>50

Hi Alejandra

The Inequalities: Linear section explains how to solve inequalities like this.

DAiv