Please help, will
Grant brainliest

45.

Step-by-step explanation:

This is the sum of  5 lots  of 3i  where i  = 1 to 5

= 3*1 + 3*2 + 3*3 + 3*4+3*5

=  3+6+9+12+15

=  45.

45

Step-by-step explanation:

12

step-by-step explanation:

false

step-by-step explanation:

the reason i say this is because for a certain length of sides you can pick any two and the length is wither equal or greater than the third side and in this case it's not.

3 + 5 = 8

8 is smaller than 9 which is the third side.

hope this : )