Please help me with this question please thank you for your help

Name the quadrilaterals that have four equal sides.

5,600 x 10^3 = a) 560 b) 5,000,600 c) 5,600,000 d) 56,000

Aregular pentagon with a perimeter of 21 inches is dilated by a scale factor of 5/3 to create a new pentagon. what is the perimeter of the new pentagon?