Math

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1)The sum of a number and 17 more than twice the same number is 101. Find the number.

17+2n=101
17-17
101-17
2n=84
n=42(answer)

2)Evaluate: 5-/a+5b/ if a=-12 and b=2.

5-/-12+5(2)/
5-/-12+10/
5-/-2/
5-2
3(answer)

  • Math -

    1. The sum of a number and 17 more than twice the same number is 101 should be:
    n + (2n+17) = 101

  • Math -

    Yes, I totally missed some of the wording.

    Yes, Quidditch is right for question 1.

    Good looking out, Quidditch!

    blueridge

  • Math -

    OK, I think you are correct
    5 - |-2|
    =5-2
    =3

  • Math -

    2. I am not sure what
    5-/-2/
    means.
    If / is supposed to be a bracket or parenthesis then:
    5-[-2]
    =5+2

  • Math -

    / is suppose to be absolute value

  • Math -

    The equation is set up correctly. Good job!

    Let's see:

    17 + 2n = 101....Original Equation

    Subtract 17 from both sides.

    2n = 101 - 17

    2n = 84

    Now divide both sides by the coefficient 2 to find the value of n.

    n = 84/2

    n = 42

    Is this true?

    Let's plug 42 for n in the Original Equation above and simplify. If we get the same answer on both sides, then n = 42 is right.

    You developed:

    17 + 2n = 101....Original Equation

    Let n = 42

    17 + 2(42) = 101

    17 + 84 = 101

    101 = 101...It checks!!!

    Yes, n = 42.

    =========================

    NEXT: You are told to evaluate.
    To evaluate means to replace the variables given with the given values and simplify.

    Evaluate: 5-/a+5b if a =-12 and
    b = 2.

    However, I just noticed that you made a typo in terms of 5.

    What exactly are you subtracting from 5?

    Do you see what I mean?

    The second question is not typed correctly.

    Write back when you fix the typo.

  • Math -

    Part 1
    I don't think you set up the equation correctly. See me first response

  • Math -

    I know that and I thanked you for correcting me.

    We all make mistakes, right?

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