Xb+12-1/3b-13 what is the value of x

Which math sentence can be used to determine if the triangle is a right triangle?

Landon wrote that 3−2.6=4. which statement about his answer is true?

6. sarah saved $12.75 every week for a number of weeks, w. she received an additional $25 during the last week in which she saved money. write and solve an equation to find the number of weeks, w, for which sarah had saved money if she has $114.25 now.