1) Write expressions of relational algebra for the following queries draw the query trees for each and write the SQL statement: a. What PC models have a speed of at least 3.00 b. What the model numbers of all color printers c. Which manufacturer make laptops with at least 100 GB d. Find the model and price of all products (of any type) made by manufacturer "B" e. Find the manufacturers that sell laptops but not PC.