for question 3 should be 4096
Multiplication and Division. Quantities with exponents can be multiplied and divided easily if they have the same base. Since all number in scientific notation have base 10, we can always multiply them and divide them. To multiply two numbers in scientific notation, multiply their coefficients and add their exponents.
Substitute the x for 16 and put it in your calculator, so, 1/3(4-16)^2