Which of the following is the general term for the sequence a, -a, a, -a, . . .? (- a) ^n
(-1) a^n + 1
a(-1) ^n - 1

Successful implementation of a new system is based on three independent modules. module 1 works properly with probability 0.96. for modules 2 and 3, these probabilities equal 0.95 and 0.90. compute the probability that at least one of these three modules fails to work properly.

You dug a hole that was 8 feet deep. after taking a short break, you dug down 3 more feet in the same hole. when finished digging, a tractor accidentally filled the hole with 4 feet of dirt. how deep is your hole now?

Which of the following circles have their centers on the x-axis? check all that apply.