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alisha [4.7K]
3 years ago
10

I need to know the answer for 19,20,21

Mathematics
1 answer:
pantera1 [17]3 years ago
7 0
19. $30,681.82
20. Find surface area for this one
21. Use geometry
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Write the first five terms of the arithmetic sequence. a4 = 22, a10 = 64
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Hello :
the general term is : 
an = a1+(n-1)×d  
or : an = ap +(n-p)×d......d is common diffrence
let : n=10 and p= 4
a10 =  a4 +(10-4)×d
64 = 22 + 6d
6d =  42
d= 7
conclusion :
a4 = 22
a3 = 22-7=15
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