exam Maths Puzzle Numerical Ability

This question is confusing me. Please help.

Graph the inequality and shade in the correct area of the graph

x - 3y is less than or equal to 0

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exam Other Question

Do exponential functions only model phenomena that grow, or can they also model phenomena that decay? Explain what is different in the form of the function in each case. Solve the following problem:

What is the expression raised to the fourth power is 81x^12y^8z^16?

I have tried to figured this problem out and cannot seem to figure out how to solve. I need some help with this one, thanks.