Which of the following has a solution set of xlx=0)?

What is sin 7x/4 ? i need on this urgent trig

Solve 2^x=32 and rewrite this equation in a logarithmic form

List x1, x2, x3, x4 where xi is the left endpoint of the four equal intervals used to estimate the area under the curve of f(x) between x = 4 and x = 6. a 4, 4.5, 5, 5.5 b 4.5, 5, 5.5, 6 c 4.25, 4.75, 5.25, 5.75 d 4, 4.2, 5.4, 6