Could you help to answer the question attach step by step please

Data below shown ( QUIZ ) score, assignment score ( ASG ) , Index Cumulative achievement ( IPK ) until last semester and final term score ( UA ) statistic major from 20 college student Statistic teacher would like to know what effect UA score for college student QUIZ ASG IPK UA QUIZ ASG IPK UA 88 22 2.8 65 95 61 3.3 43 100 80 3.2 82 92 69 3.1 55 92 54 3.4 71 100 86 3.5 88 84 61 3.6 85 81 67 3.5 57 56 76 2.8 37 100 96 3.8 80 81 28 3.0 60 69 51 2.8 20 85 67 3.2 52 80 75 3.6 64 96 83 3.0 66 74 70 3.1 38 79 60 3.7 87 79 66 2.9 78 96 69 3.7 88 95 83 3.3 46 a. Define multiple regression models for UA by using GPA and QUIZ variables and calculate the R2? b. What can be inferred from the calculation of R2 in the answer (a) above