a. The marginal densities

and

b. This can be obtained by integrating the joint density over [0.25, 1] x [0.5, 1]:

subtract 6.4 from 25 = 1.3c + 18.6
Answer:
Irrational
Step-by-step explanation:
Since √3 is a non-terminating decimal (it repeats forever), it will be an irrational number.
Answer:
1. 2/5,-3 2. 
Step-by-step explanation:
i used the quadratic formula to find x also please note that 2 has 2 answers bc of the +- beofre the sqrt of 13