Help simplifying expressions?

Ben Roberts

New member
Need sum help on a few of my math problems here tonite, if ya can plz show ur work thx

1. 65 is 70% of what number?

2. 18n+12<(2n-1)
_

The _ is under that <

3. (x^2)^4 / (5x)^3

4. [16t^3/8s^4]^2

5. (x^-5 y^4)^-1
 
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