What times what is equal to 343 has to be a # times a #

Aregular hexagon rotates counterclockwise about its center. it turns through angles greater than 0° and less than or equal to 360°. at how many different angles will the hexagon map onto itself?

Which of the following is the true for f(x) = 5cos

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'