Please help me in understanding how to do problems like the practice problem attached.My professor really hasn't been doing the best explaining.

Dam Table Average Weekly Avemslng Rumba! oi Numuel oi Sales [5601]) High Temperature Spending {5000) Website Hits Ordels Placed 96 558.9 36 2 416 B 409 5? ? EU 9 2396 130 84 43 8 EU 2 729 41 619 41 5 3i] 7 2824 42 514 44 1 51 T 3333 42 313 77.3 32 3 1714 38 55 42.2 EU 3 343 B 145 29 2 19 6 43 12 217 47 i] 19 E 1153 56 209 :11 2 40 1 609 35 167 40.7 64 1 371 37 152 31.2 17 1 73? 36 258 75 9 15 2 576 25 T2 45 6 28 2 2132 12 79 27 4 22 B 59 25 988 57 2 20 5 8355 55 458 52.0 16 5 1422 59 39 3?.1 26 4 1112 35 462 53 4 1S 5 1539 3B 328 95 4 1 4 5 2441] GB An entrepreneur owns and operates a medium sized company that sells sunglasses and beachwear to retailers He is interest in analyzing the eect of several variables on the weekly sales for his business. He has collected data for a sample ol20 weeks Use the accompanying data set to complete parts a through c. a Click the Minn for the data on company performance. a. Produce a regression equation that will predict the sales as a function of the other four variables. Let y be Sales [in thousands of dollars), x1 be Average Weekly High Temperature. x2 be Advertising Spending (in thousands otdoliars], x3 be Number of Website Hits. and x, be Number of Orders Placed. ;: + Dx1+( Dx2+[ Dx3+[ qu {Round the constant to the nearest integer as needed Round all other values totwo decimal places as needed. Do not includethe S symbol In your answer.)