Algebra Exponents and Roots Practice Test Results

Question 1
57% answer correctly
What`s the square root of \\(16x^2\\) ?
4x
\\(\\sqrt{4}x\\)
\\(4\\sqrt{x}\\)
\\(\\sqrt{4x}\\)
Question 2
57% answer correctly
What is the root in \\(\\sqrt[3]{64}\\) ?
4
3
\\(\\sqrt{ }\\)
64
Question 3
94% answer correctly
The square of 7 is ?
36
777
49
343