exam Maths Puzzle Numerical Ability

simplify and evaluate
(4^2x^3y^-2z^-3/x^-5y^8z^-8)^2

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exam Other Question

Solve loga (7x +1) = loga (4x +16)
a. 4
b. 5
c. 6
d. 8
Solve by substitution method. Indicate whether independent, inconsistent or dependent.

3y=x+5
3x-9y=-10