Mortgage rates rose this week, with fixed-rate loans rising 0.02 percentage point and adjustable-rate deals up 0.07 percentage point, the Federal Home Loan Mortgage Corp. said. The agency, which buys mortgages from lenders and packages them as securities for sale to investors, said fixed-rate loans rose to 10.46% this week, up from 10.44% the week before. Adjustable-rate mortgages averaged 7.89%, up from 7.82% last week. The fixed-rate average is for a 30-year loan covering 80% of a home's cost. The average adjustable-rate mortgage also is for 30 years but for 75% of the home price.