What is the answer for 30 tens - 30 tens and 3 tenths

15 point ! ~ see if you know the answer to both you!

Christina can paint 420 square feet in 105 minutes. which unit rate describes the scenario?

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.