The answer is C . -7r^2 + 12r -8
Step-by-step explanation:
look at the picture !
she has to paint actually 6 rectangles :
the 3 tops of the 3 stairs.
and the 3 vertical front boards (the front of each step of the stairs).
what is the area of these rectangles ? summing up all 6 - that is the surface area to be painted.
each top rectangle is clearly
82×19 (19 cm deep) = 1558 cm²
each front board is
82×12 (12 cm high) = 984 cm²
so, in total we have
3×1558 + 3×984 = 4674 + 2952 = 7626 cm²
as surface area to be painted.
I use edge also most of the answers come for this app all u have to do is copy and paste your answer hopefully this helps
Answer: Lesser = 19, Greater = 21
See picture reply.
Just divide 948.6 m^3 by 3.1 m and 5.1 m to get 60 m
