If rl = 00FF 16 and r 2 = 4, what is the value of r0 after

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If rl = 00FF16 and r2 = 4, what is the value of r0 after each of the following instructions has been executed (assume that each instruction uses the same data)?

a. ADD r0, rl, rl, b. ADD r0, rl, rl, c. ADD r0, r1, rl, LSL #2 LSL #4 ROR #4 

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