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SIZIF [17.4K]
4 years ago
6

I really need help with questions (a) through (e) 20pts for the answer - THANK YOU

Mathematics
1 answer:
timurjin [86]4 years ago
6 0
A) 7x+5 = 2x-35
   -2x       -2x
   5x + 5 = -35
     -5      -5
    5x = -40
   x = -8
b) x/3 - 7 = -5
         +7    +7
    x/3 = 2 .. Multiple by 3 both sides
     x = 6
c)  4x+5  = 4x+1 
     -4x       -4x
      1 = 5 , This is NOT true .. 
       NO SOLUTIONS

I added pics with others

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3 years ago
During a game, Dennis lost 50 points in the first round and then lost 75 more points in the second round. Write an addition expr
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3 years ago
Evaluate : -80 - (-15) =
frosja888 [35]

Answer:

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Step-by-step explanation:

-80 - -15

Two minuses become plus

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6 0
3 years ago
Read 2 more answers
Help please!! i don’t understand this one!
12345 [234]

Answer:

  C, D

Step-by-step explanation:

This equation can be solved any of several ways. One that doesn't require much thought is using the quadratic formula.

For ax² +bx +c = 0, the solutions are ...

  x=\dfrac{-b\pm\sqrt{b^2-4ac}}{2a}

In the given equation, a=2, b=11, c=5, so this becomes ...

  x=\dfrac{-11\pm\sqrt{11^2-4\cdot2\cdot5}}{2\cdot2}=\dfrac{-11\pm\sqrt{81}}{4}\\\\x=\dfrac{-11\pm9}{4}=\left\{-\dfrac{20}{4},-\dfrac{2}{4}\right\}=\{-5,-\frac{1}{2}\}

The solutions are ...

  C. x = -5

  D. x = -1/2

_____

My personal favorite is using a graphing calculator. The solutions are the x-intercepts of the expression on the left. That is, where its value is zero, as the equation says.

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3 years ago
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I believe the answer is 9.
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3 years ago
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