What is the perimeter of triangle ABC? (nearest tenth)

(answer choices in picture)

How do i do this activity, is appreciated

Elena is paid a constant rate for each hour she works. the table shows the amounts of money that elena earned for various amounts of time that she worked.

Evaluate this using ! 0.25^2 x 2.4 + 0.25 x 2.4^2 − 0.25 x 2.4 x 0.65