URGENT URGENT URGENT Which expression is equivalent to (7x^3)^2(x^8)^1/2
A 14x^10
B 49x^10
C 14x^7
D 49x^7

Find the solution of this system of equation -7x+y=-20 9x-3y=36

7. the area of the playing surface at the olympic stadium in beijing isof a hectare. what area will it occupy on a plan drawn to a scaleof 1: 500?

Find the perimeter of the triangle with vertices  d(3, 4),  e(8, 7), and  f(5, 9). do not round before calculating the perimeter. after calculating the perimeter, round your answer to the nearest tenth.