6,000,000+80,000+10 in standard form

What is the solution to the equation? k/6.4=8.7 2.3 5.568 15.1 55.68

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

In the figure below, ∠dec ≅ ∠dce, ∠b ≅ ∠f, and segment df is congruent to segment bd. point c is the point of intersection between segment ag and segment bd, while point e is the point of intersection between segment ag and segment df. the figure shows a polygon comprised of three triangles, abc, dec, and gfe. prove δabc ≅ δgfe.