Ed is on a road trip he has already traveled 211 miles driving at a rate of 63 miles per hour which equation could be used to find how many hours x ed has left in his road trip if he is traveling 638 total times A. 63x + 638 = 211
B. 63x + 211 = 638
C. 211x + 638 = 63
D. 211x + 63 =638

Can someone me with this problem i don't understand i need

Luke started a weight-loss program. the first week, he lost x pounds. the second week, he lost pounds less than times the pounds he lost the first week. the third week, he lost 1 pound more than of the pounds he lost the first week. liam started a weight-loss program when luke did. the first week, he lost 1 pound less than times the pounds luke lost the first week. the second week, he lost 4 pounds less than times the pounds luke lost the first week. the third week, he lost pound more than times the pounds luke lost the first week.

What is the value for this expression? 2e-5