5/17/11

Test 4 Section 9 - #7 (page 611)

OK, you're going to have to do some tricky solving for this one. Start by solving for x:

x = ⅓
x½ = 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 y, so we can't go the obvious 42 route. Instead, we're going to have to say that z = 4 and y = 2. 24 = 16 as well.

So, x = 9, and z = 4. x + z = 13. That's choice (D).

2 comments:

  1. isn't 2.2^4= 32 ? I'm sorry I don't get it

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  2. I 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.

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