book Maths Puzzle Numerical Ability

what does 5 to the negative 4th power equal?

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book Other Question

how do I do:
x=-3y+10
-x+y=-10

using the substitution method i am having trouble getting all the information needed to solve the followsing polynomial function
for the function f(x)=x^2-2x-15 determine each of the following:
*turns upwa