Answer:
A on edu2020
Step-by-step explanation:
9y+45
9(y+5)
=9*y+9*5
=9y+45
144.2 cm
Length of the iron rod is 7.4cm
Radius is 3.1m
Therefore the surface area can be calculated as follows
= 2πrl
= 2×3.142×3.1×7.4
= 144.2 I'm
Hence the surface area is 144.2cm
42 seconds