5
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-- First, you say to yourself "I know that 2-3 means 1/23 ."
-- Then, you calculate the value of 23, and put it in the denominator of that fraction.
48
2 to the 2 power = 4 -3 to the 2 power = 9 4 to the 2 power = 16 You don't indicate what to do to the 4, but 9 + 16 = 25
22 + 35 = 2*2 + 3*3*3*3*3 = 4 + 243 = 247
2^5 x 2^3 = 2^8 = 256
216