Homework Help: Math

Posted by Jon on Sunday, February 24, 2008 at 1:53pm.

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 - Quidditch, Sunday, February 24, 2008 at 2:10pm
1. The sum of a number and 17 more than twice the same number is 101 should be:
n + (2n+17) = 101
- Math - blueridge, Sunday, February 24, 2008 at 2:22pm
  Yes, I totally missed some of the wording.
  
  Yes, Quidditch is right for question 1.
  
  Good looking out, Quidditch!
  
  blueridge
  - Math - Quidditch, Sunday, February 24, 2008 at 2:26pm
    OK, I think you are correct
    5 - |-2|
    =5-2
    =3
Math - Quidditch, Sunday, February 24, 2008 at 2:18pm
2. I am not sure what
5-/-2/
means.
If / is supposed to be a bracket or parenthesis then:
5-[-2]
=5+2
- Math - Jon, Sunday, February 24, 2008 at 2:23pm
  / is suppose to be absolute value
Math - blueridge, Sunday, February 24, 2008 at 2:19pm
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 - Quidditch, Sunday, February 24, 2008 at 2:23pm
Part 1
I don't think you set up the equation correctly. See me first response
- Math - blueridge, Sunday, February 24, 2008 at 6:27pm
  I know that and I thanked you for correcting me.
  
  We all make mistakes, right?

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