You have 45 more days of school left. How many years is that?

1. what is the measure of ∠abc? what is the measure of ∠abd?

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.

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.