Please show equation if it's possible! Thank you.

The return on the Rush Corporation in the state of recession is estimated to be-24% and the return on Rush in the state of boom is estimated to be 32%. The return on the Oberman Corporation in the state of recession is estimated to be 44% and the return on Oberman in the state of boom is estimated to be-15%. Given this information, what is the covariance between Rush and Oberman if there is a 0.40 probability that the economy will be in the state of boom and a 0.60 probability that the economy will be in the state of recession Place your answer in decimal form and not as a percentage. CHECK