Answer:
1458/3456 reduces to 27/64 (after simplification)
The cube root of 27/64 equals 3/4
The square of 3/4 calculates to 9/16
Multiplying 9/16 by 1024 results in 576.
THIS IS THE ACTUAL WORK AND RESULT
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Answer:
The original cost amounts to $10
Step-by-step explanation:
Let us denote the cost as x
where Price = x + (0.5x) = 1.50x
Now, the price after reduction is 20% of 1.50x
which is 0.3x 
This leads to the equation 1.50x - 0.3x = 12
resulting in 1.2x = 12
which gives us x = 10
thus, the cost is $10
Response:
9.55 minutes
Step-by-step breakdown:
x hours to reach the river
0.25-x hours for the return trip, as 15 minutes equals 0.25 hr.
to the river 40 mph * x hours =40x miles
from the river 70 mph (0.25-x) hours=17.5-70x
these two equations are equivalent
40x=17.5-70x
110x=17.5
x=17.5/110=0.159 hours
9.55 minutes