Question 377618
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Hi
c=2x+20
Can only assume that x is the number of units and c is the cost of producing them.
 (a)$430  
$430 = 2x + 20
$410 = 2x
205 = x, the number of units costing $430  (205,430)
(b)$700  c = $700
$700 = 2x + 20
$680 = 2x
340 = x, the number of units costing $700 (340,700)
(c)$1,400  c =$1400
$1400 = 2x + 20
$1380 = 2x
690 = x the number of units costing $1400 (690,1400)