please answer questions 7,8 true or false with an explanation. many thanks

7. According to the Carhart four-factor model, the lower the momentum of a stock, the greater is its expected rate of return. True False 8. Consider a single factor APT. Portfolio A has a beta of 1.0 and an expected return of 12%. Portfolio B has a beta of 1.5 and an expected return of 17%. The risk-free rate of return is 4%. If you wanted to take advantage of an arbitrage opportunity, you should take a short position in portfolio A and a long position in portfolio B.- True False