Please help! and by the way, 28.17% and 33.42% are not the right answers.

If it's possible, please don't use the Excel, instead please show your work and the formulas used in the calculation process, thank you!

RA=3.0%+1.05RM+eARB=1.2%+1.20RM+eBM=29%;R-squareA=0.29;-squareB=0.14 Assume you create a portfolio Q, with investment proportions of 0.50 in a risky portfolio P,0.30 in the market index, and 0.20 in T-bill. Portfolio P is composed of 60% Stock A and 40% Stock B. a. What is the standard deviation of portfolio Q? (Calculate using numbers in decimal form, not percentages. Do not round intermediate calculations. Round your answer to 2 decimal places.) RA=3.0%+1.05RM+eARB=1.2%+1.20RM+eBM=29%;R-squareA=0.29;-squareB=0.14 Assume you create a portfolio Q, with investment proportions of 0.50 in a risky portfolio P,0.30 in the market index, and 0.20 in T-bill. Portfolio P is composed of 60% Stock A and 40% Stock B. a. What is the standard deviation of portfolio Q? (Calculate using numbers in decimal form, not percentages. Do not round intermediate calculations. Round your answer to 2 decimal places.)