How many variable terms are in the expression 3x3y + 5xz − 4y + x − z + 9?

Given the function f(x) = log base 4(x+8) , find the value of f^-1(2)

What is the prime factorization of 195

Dylan and dusty plan to take weekly surfing lessons together. if the 2-hour lessons are $20 per person and they plan to spend $100 each on new surfboards, what is the maximum number of lessons the two can take if the total amount spent for lessons and surfboards is at most $480?