olve the equation analytically. 6)7x-(5-x)-2(3-(4 + 6x-9)] B). 21) 7)-8.9x -79.2

Question

olve the equation analytically. 6)7x-(5-x)-2(3-(4 + 6x-9)] B). 21) 7)-8.9x -79.2 -1.7x B) (-86) D) (8.9) 37 37 C) (4) lassify the equation as a contradiction, an identity, or a conditional equation 9) 4(4x + 10) 16x +40 A) Contradiction B) Identity C) Conditional 10) 6x + 46 3(2x + 13) A) Contradiction B) Identity C) Conditional 11) 5x-(6-x)=5[3-(6 + 3x4)] B) Conditional C) Contradiction A) Identity olve the problem. 12) The length of a rectangle is 8 inches more than the width. The perimeter of the rectang D) 44 in. inches. Find the width of the rectangle. B) 36 in. C) 40 in. A) 8 in. 13) Regrind, Inc. regrinds used typewriter platens. The cost per platen is $1.00. The cost to platens is $600. Find the linear cost function to regrind platens. If reground platens se each, how many must be reground and sold to break even? A) C(x) = 1.00x + 550 break-even 560 C) C(x)- 1.00x+550 break-even 71 B) C(x) = 1.00x + 600 break-even 62 D) C(x) -1.00x+600 break-even = 78

Explanation / Answer

6) 7x - ( 5 - x ) = 2 ( 3 - ( 4 + 6x - 9 ) )

7x - 5 + x = 2 ( 3 - ( 6x - 5 ))

7x - 5 = 2 ( 3 - 6x + 5 )

7x - 5 = 16 - 12x

20x = 21

x = 21/20

option c is correct

7 ) - 8.9 x = - 79.2 - 1.7 x

- 8.9 x + 1.7x = - 79.2

- 7.2 x = -79.2

x = 11

option a is correct

3) ( x- 8 ) / 2 = ( x+ 5) / 8

cross multiplying

8 ( x - 8) = 2 ( x+ 5)

8x - 64 = 2x + 10

6x = 74

x = 74/6

x = 37/3

option b is correct

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