One winter morning, the temperature was -2°c. By 11:00 A. M., the temperature had decreased by
3º. At 4:00 P. M., the temperature reached oºc.
What integer represents the temperature
change from 11:00 A. M. to 4:00 P. M.? please help me

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.

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?