Problem
Find the domain of the function. \[ f(x)=\sqrt{4-7 x}+4 \] The domain is (Use integers or fractions for any numbers in the expression. Type your answer in interval notation.)
Solution
Step 1 ：\(4 - 7x \ge 0\)
Step 2 ：\(x \le \frac{4}{7}\)
Step 3 ：\(\text{Domain}: (-\infty, \frac{4}{7}]\)
