Answer:
158
Step-by-step explanation:
5*8=40
8*3=24
3*5=15
Each of these measurements gets added twice, becasue there are 6 faces on a rectangular prism.
40 + 40 + 24 + 24 + 15 + 15 = 158
Answer:



Step-by-step explanation:
We are given the following recursive formula:

And consider 
a2

a3

a4

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Answer:
a.3
Step-by-step explanation:
2:x and 12:18
We need to get from 2 to 12 and 3 to 18
2* something = 12 x* something = 18
Divide by 2
something =12/2
something =6
x*6 = 18
x = 18/6
x=3
Perimeter of sector = 2 radius + (radius × central angle)