
4ˣ⁻¹ = 49 / 4
<h3>How to simplify an expression?</h3>
The expressions can be simplified as follows;

Hence,

Therefore,

Finally,


2ˣ = 7
4ˣ⁻¹ = 2²⁽ˣ⁻¹⁾ = 2²ˣ ⁻ ² = 2²ˣ / 2² = (2ˣ)² / 2²
Therefore,
(2ˣ)² / 2² = 7² / 2² = 49 / 4
Hence,
4ˣ⁻¹ = 49 / 4
Finally, the
is equal to
and for the second part 4ˣ⁻¹ = 49 / 4
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12x +50 = 170
-50 -50
12x=120
/12 /12
x=10
Ten packets were purchased
One third of 15 is 5 because 15/3=5. There are 60 minutes in an hour and Yana slept for 5, so 5*60= 300. Yana slept for 300 minutes.