alg 2.

posted by .

solve. we can use a calculator on this part...
2e^-x+4=21. how do i do this problem.

i know that you subtract 4, but what do you do after that?

  • alg 2. -

    2e^-x+4=21
    2 e^-x = 17
    e^-x = 17/2
    1/e^x = 17/2
    so
    e^x = 2/17
    take natural log of both sides
    x = ln (2/17)

  • alg 2. -

    can you please show me how you got e^x=2/17. thanks

  • alg 2. -

    in general
    a^-b = 1/a^b

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Physics

    A rock is dropped from a height of 100m. a) how long does it take to fall the first 50m?
  2. math,help!!!!

    How do i do thois problem?Please help. Problem #1 solve the system by subtraction. 5x-3y=13 4x-3y=11 Subtract the lower equation's left and right terms from the upper equation's corresponding terms. The first step will get you this:
  3. Math

    I am putting < for the square root abbreviation. I don't know how to use it on my comp. 3<99-2<44-6<11=?
  4. MATH! HELP!!!

    I am putting < for the square root abbreviation. I don't know how to use it on my comp. 3<99-2<44-6<11=?
  5. Alg.2

    find all zeros of the function. f(x) = x^3-10x^2+33x-34 I found 2, using my calculator. What do i do after that?
  6. alg 2

    evaluate cot 11 pie/6 to the nearest hundred angle given in radians.. is there a way to put this in calculator. another ?
  7. Pre Calc

    use properties of the trigonometric function to find the exact value of each expression. Do no use a calculator. sec ( - pi/18) * cos (37 pi)/18 I do not see how to do this problem. Every time I do it out I get a reference angle of …
  8. Trigonometry college

    Use a calculator to solve csc (theta) = -3. I know the answer is 3.48 and 5.94 but I need the steps to take on the calculator to arrive at the answer. I have a ti-84 calculator. thanks!
  9. math concepts

    Matthew sits at his desk unable to figure out the answer to a division problem. He reaches into his desk and pulls out a calculator. What is the correct response for Matthew's teacher to have?
  10. Mathematics concepts

    Matthew sits at his desk unable to figure out the answer to a division problem. He reaches into his desk and pulls out a calculator. What is the correct response for Matthew's teacher to have?

More Similar Questions