Answer:
Step-by-step explanation:
the sequence of numbers decrease by 6 each time, so we can write:
f(1) = 5
f(2) = -1
f(3) = -7
f(1) - f(2) = 6
or:
f(2) = f(1) - 6
which means:
f(n + 1) = f(n) - 6
10
5 to the power of 2 is 25, and -3 times 5 is -15, so 25-15=10