A dad buys a ball and a team cup for each of the 10 players on the dodgeball team. Each team cup costs $8.50. The dad spends a total of $279 for the balls and team cups. Write an equation that models the situation with u, the cost of one ball.

I don't know if its 279 = 8.50 + 10u Help

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.