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Verified answer
B = (210 - 255) / (8 - 5)b = -45 / 3
b = -15
U5 = a + 4b
255 = a + 4(-15)
255 = a - 60
a = 255 + 60
a = 315
Un = a + (n - 1)b
0 = 315 + (n - 1)(-9)
0 = 315 - 9n + 9
9n = 324
n = 324 : 9
n = 36
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