Answer:
a15 = 75
Step-by-step explanation:
d = ?
a3 = -3
a5 = 10
an = a1 + (n-1) d
10 = a1 + (5-1) d
10 = a1 + 4d
a1 = 10 - 4d
-3 = (10-4d) + (3-1) d
-3 = 10-4d + 2d
-3 = 10 - 2d
2d = 13
d = 13/2
a1 = 10 - 4(13/2)
a1 = 10 - 26
a1 = -16
a15 = -16 + 14 (13/2)
a15 = -16 + 91
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Answer:
a15 = 75
Step-by-step explanation:
d = ?
a3 = -3
a5 = 10
an = a1 + (n-1) d
10 = a1 + (5-1) d
10 = a1 + 4d
a1 = 10 - 4d
-3 = (10-4d) + (3-1) d
-3 = 10-4d + 2d
-3 = 10 - 2d
2d = 13
d = 13/2
a1 = 10 - 4(13/2)
a1 = 10 - 26
a1 = -16
a15 = -16 + 14 (13/2)
a15 = -16 + 91