Question

Please help with this question

Answer 1

Answer:

-71.74

Step-by-step explanation:

$a + (4d) = - 3.7 \\ \\ a + 14d = - 52.3 \\ \\ subtracting \: these \: \: 10d = - 48.6 \\ \\ d = - 4.86 \\ \\ \\ a = - 3.7 - 4(4.86) \\ \\ a = - 3.7 + 19.44 \\ \\ a = 15.74 \\ \\ \\19 \: th \: term = a + 18d \\ \\ = 15.74 + 18( - 4.86) \\ \\ = 15.74 - 87.48 \\ \\ - 71.74$