the answer is x= 4
AB and CD are the same length
8x-1 =31
8x=32
x=4
The number of permutations of the 4 different letters, taken two at a time, is given by:
Hello:
(5x^3)(2x)^3 = (5x^3)(2)^3(x)^3 = <span>(5x^3)8x^3=40x^6 ... (answer C)</span>
Answer:

Step-by-step explanation:
the answer u will get after