Evaluate 8d, when d=12 Evaluate 75/d (75 divide by d), when d = 5

Evaluate 6p^2 + 8(6 times p to the second power plus 8), when p = 4

Acompany made a profit of 75000 over a period of 6 years on an initial investment of 15000 what is the annual roi

Need solving this 2nd limit problem.

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.