Are the following sets recursive? are they recursively enumerable? justify your conjectures.
a) { x | x is an even number }
b) { i | mi halts for all inputs }
c) { i | mi halts only for prime integers }
d) { i | mi is not a turing machine }

2pointswho was mikhail gorbachev? oa. a russian leader who opposed a coupob. a polish leader who founded the labor union "solidarityoc. a soviet leader who called for a closer relationship with the unitedstates, economic reform, and a more open societyd. a soviet leader who called for more oppression in the soviet union

1. which of these is not true about torsion bars? a. they can be used to adjust ride height b. they can be adjusted anytime since they don't affect alignment angles c. they attach between the frame and the lower control arm d. they twist to produce a spring effect

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