Steve goes to school 350 miles from home. Driving home one weekend, he travels 70 mph for the first 140 miles, and then slows to 30 mph for 30 miles of a construction zone. He drives the last 180 miles at 60 mph. How long did it take Steve to get home? A. 2 hr. B. 4 hr. C. 6 hr. D. 8 hr.

Can someone check if i did this correct. it’s number 4 if you’re wondering.

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

Frank is lending $1,000 to sarah for two years. frank and sarah agree that frank should earn a real return of 4 percent per year. instructions: a. the cpi (times 100) is 100 at the time that frank makes the loan. it is expected to be 113 in one year and 127.7 in two years. what nominal rate of interest should frank charge sarah?