Answer these in scientific notation with work shown, adding scientific notation.

1.8 x 10^5 + 2.8 x 10^1

9 x 10^-4 + 4 x 10-6

2.5 x 10^2 + 8.4 x 10^2

3.9 x 10^-1 + 1.6 x 10^-2

7 x 10^-2 + 9.57 x 10^-3

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.

What is the distance from zero if a quadratic function has a line of symmetry at x=-3 and a zero at 4

If mary had 320 toy cars and she gave her friend 50 cars and then she gave her brother 72 more cars how much toy cars would mary have left ● explain with proper details