Since the 2 and x^1/4 are multiplying we can do the math separately and then just multiply them afterwards
2^-4 is the same as 1/(2^4) which is 1/16
(x^1/4)^-4 (POWER RULES REVIEW)
2 exponents of same base you just add (basically multiply the two)
so x^(1/4x-4) = x^(-1)
which is just 1/x
so the answer is 1/16x
Two lines are perpendicular when the product between the slopes of the lines is equal to -1, then, if we have the following lines:

they will be perpendicular if,

According to the exercise, the first line is:

the slope for this line is -4.
Write the equation that makes two lines perpendicular,

solve for m2,

Answer:
The slope of the line perpendicular to y=-4x+7 is 1/4.
So he bought 8.5 pounds, and you have to find out how many ounces he bought. That would mean that you have to convert pounds to ounces. There are 16 ounces in 1 pound. In 8.5 pounds, there are 136 ounces.
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.035 is the answer to your question