The Purplemath Forums

I have trouble on word problems. :confused: Please help me on these two problems! I am just wondering how to put these into a solvable equation. Larry is 8 years older than his sister. In 3 years, he will be twice as old as she is now. How old are they now? For Larry's sister, her age now is x. And ...

For Larry's sister, her age now is x. And for Larry, his age now is x+8, and in 3 years it will be 2x. Is this correct? Yes. And also, in three years his age will be (x + 8) + 3. Can you see the equation to solve? Thanks. I solved this equation! 8-) It seems pretty easy now. :clap: Rocky spends a t...

http://kib2.free.fr/geoPyX/parallelogram.png Angle A is (2y-5) and Angle D is (x+50). The exterior angle of Angle C is (3x+20). What is x and y? I am pretty confused with this one. I know that the opposite angles of a parallelogram equal each other, so Angle C is (2y-5). Angle C+the exterior angle ...

I have trouble on graphing the inequality on a number line. I can do simple ones like x<8 or something like that, but I can't do ones with the word "or" in it, such as "x>2 or x<3". Is there a site that explains this thoroughly? :confused: I would appreciate if you could help. :D

How do you find the measure of an angle where its supplement is 10 degrees more than its complement? I don't want to do guess and check. If the angle is x and the complement is 90-x would the supplement be (90-x)+10? I tried doing x+90-x+10=180, but the x cancels out, so I have no idea what to do. ...

:wave: Hello again! Thanks for helping me out so many times! I definitely appreciate it! :wink: How do you find the measure of an angle where its supplement is 10 degrees more than its complement? Work in steps: The supplement and complement are defined in terms of the angle, so pick a variable to s...

The angle is x, the supplement angle is 90-x+10 What is the definition of a supplementary angle? Does your expression ("80 - x") fulfill this definition? Um, what do you mean by 80-x? Is it the supplementary angle of the 90-x+10 one? :?: I'm supposed to do something like this: {x: x>8 or ...

Um, what do you mean by 80-x? Sorry; I'd transposed the "minus" sign. You've provided an expression which simplifies to "100 - x". But what is the definition of a supplementary angle? So what expression would stand for "supplement of x"? Oh. So you mean 100-x=180-x? :i...

Natural numbers can't be negative, so how do you solve something like this: {the natural numbers between -5 and 4} Would it be no solution or something? :confused: What is the equation for: two-thirds of the way from -11 to 5? And what is two thirds of the way from -11 and 5? How do you solve someth...

two-thirds of the way from -11 to 5? How far apart are these two numbers? (Hint: Subtract.) What is one-third of that distance? (Hint: Divide.) What then is two-thirds of the way from the lower number to the higher number? (Hint: Add.) Could you please clarify on the last two steps? Like how to do ...