9.9/0.35 * 4.2/36 = 41.58/12.6=3.3
Ответ: 3.3
a1 = 96.4
d = -4.6
an -a1 + d(n-1)> 0
n = 21
y" = 11/ (х+4) - 11
11х + 44 = 11
х=-3
f(-3) = 28