*x*:

*x*

^{-½}= ⅓

*x*

^{½}= 3 (negative exponent means inverse)

*x*= 9 (square both sides to get rid of the ½ exponent)

You're also going to have to figure out y and z. The question says that

*z*>

*y*, so we can't go the obvious 4

^{2}route. Instead, we're going to have to say that

*z*= 4 and

*y*= 2. 2

^{4}= 16 as well.

So,

*x*= 9, and

*z*= 4.

*x*+*z*= 13. That's choice (D).
isn't 2.2^4= 32 ? I'm sorry I don't get it

ReplyDeleteI think you're misreading. The post doesn't say 2.2^4 = 16. One sentence ends by saying y = 2. Then the post says that 2^4 = 16, which is true.

ReplyDelete