Find the difference of 7/4 - (-1/2) (relevant work) I need this fast pleaseee!

If x + 10 = 70, what is x? a. 40 b. 50 c. 60 d. 70 e. 80

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.

You use technology ans find a sum of 6.712e-8. write this sum in standard form