Answer: 14. B 15. B
Step-by-step explanation:
14. B using arithmetic equations
an = a1 + (n-1) d
a10 = 16 + (10-1) 4
a10 = 16 + (9)(4)
a10 = 16 + 36
a10 = 52
15. B using arithmetic series
Sn = n/2 (a1 + an)
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Answer: 14. B 15. B
Step-by-step explanation:
14. B using arithmetic equations
an = a1 + (n-1) d
a10 = 16 + (10-1) 4
a10 = 16 + (9)(4)
a10 = 16 + 36
a10 = 52
15. B using arithmetic series
Sn = n/2 (a1 + an)