posted by .

I had posted this problem with you before and the answer given was 2b =A/h.

The problem is: A = 1/2bh, which is not correct?
Choices: 2A =bh, b=2A/b, 2b=A/h, b=2A/h

When I got my test back 2b=A/h was correct. Did I make a mistake or was their answer incorrect?

  • Math -

    take the original true equation
    A = (1/2)bh
    then 2A = bh is the true statement after multiplying each side by 2

    now take each of the answers and simplify by cross-multiplying
    1st is obviously correct
    2nd: b = 2A/b ---> b^2 = 2a , incorrect
    3rd: 2b = A/h ----> 2bh = A, incorrect
    4th: b = 2A/h ---> bh = 2A, correct

    The way you typed it, there are two incorrect.
    Do you have a typo in the 2nd ?

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. math,drbob222

    I'm sorry the problems i posted had a couple of errors how i posted it here they are: Posted by DrBob222 on Friday, November 24, 2006 at 6:19pm in response to Math. Thanks for showing your work. It helps us to know where you are having …
  2. chemistry

    thanks DrB I got AgCl also Could you check this problem as well?
  3. Algebra

    The answer in the book however says -(5x^2-17x-9)/(x-3)(x+2) so I don't know what I am doing wrong, can you take me step by step through the problem. I have a lot of problems, but I think once I understand what I am doing wrong with …
  4. Physics

    well, we tried searching up simple physics equations on google, as dr. bob222 suggested, but we found problems that were way out odf our range. we are looking for problems similar to this. --- Suzan does not remember which one of the …
  5. math help

    I need help solving this math problem, please: Problem: Angela's math test had 100 multiple-choice questions. Each correct answer was worth 1 point, each incorrect answer was worth -2 points, and skipped questions were worth 0 points. …
  6. Math

    I posted this problem the other day and someone answered it but when I checked my book I realized that I wrote the problem wrong. This morning when I posted I had put the wrong answer. The answer is suppose to be 1/8 but I don't understand …
  7. mat115

    Need assistance with this problem. I have computed the problem but my answer isn't matching one of the multiple choices. What am I doing wrong?
  8. math

    Sorry, Reiny, I copied the 2nd choice incorrectly. I had posted this problem with you before and the answer given that was not equalalent to A=1/2/bh was 2b =A/h. The problem is: A = 1/2bh, which is not equivalent?
  9. Probablity

    Samir had prepared the problem tests for Stages 1 to 5 of Geometry and Combinatorics for next week but forgot to label which test was for which stage. Since Samir didn't label them, the computer assigned them labels 1 through 5 randomly, …
  10. Maths

    I got 30% on a 10-problem test, 70% on a 20-problem test and 80% on a 30-problem test. If the three tests are combined in one 60-problem test what percentage is my overall score?

More Similar Questions