Which expression is equivalent to ^3√258x^10y^7 i need this now

For this case, the first thing you should do is take into account properties of exponents.
 We have then that we can rewrite the expression as follows:
 ^ 3√258 * (x ^ 10) * (y ^ 7)
 ^ 3√258 * ((x ^ 9) * (x)) * ((y ^ 6) * (y))
 (x ^ 3) * (y ^ 2) (^ 3√258 * (x) * (y))
 
 The equivalent expression is:
 (x ^ 3) * (y ^ 2) (^ 3√258 * (x) * (y))