The combination for one type of bike lock has four numbers, from 0 to 9 . the smallest combination is , on the largest combination is . how many number combinations are possible

Me with this one question, and i'll upvote the brainliest answer

Find the perimeter of the triangle with vertices  d(3, 4),  e(8, 7), and  f(5, 9). do not round before calculating the perimeter. after calculating the perimeter, round your answer to the nearest tenth.  

You buy 4 items that cost 2.69 14.45 8.05 13.95 what is the estimated total round to the nearest dollar