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Harman [31]
3 years ago
15

Solve 2(x-1) = 10

Mathematics
2 answers:
strojnjashka [21]3 years ago
8 0
You first want to get rid of 2, so you divide two on both sides canceling the two on the left and getting x-1=5. then you add 1 to both sides getting x=6. Hope this helps!
dedylja [7]3 years ago
4 0
1) Distribute the 2 to x and -1. You get: 2x - 2 = 10

2) Add 2 to both sides of the equation. You get:
2x = 12

3 Divide both sides by 2.
You get: x = 6
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The answer in interval notation is ( 73 ,  100 )

Step-by-step explanation:

If we call x and y the lower and upper values for David to get an average of 80 and 89 respectively, we can calculate these two values solving a pair of equations:

(81  +  92  + 74  +  x ) / 4  = 80     ⇒   (247  +  x  )/4 = 80

247  +  x  =  320    ⇒    x  =  320 - 247

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(81  +  92  + 74  +  y ) / 4  = 89     ⇒   ( 247  +  y ) / 4  =  89

247   +  y  =   356

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But tests are a 100-point test

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