Can anyone help me with this I will give brainalist if correct

Once upon a time I ran i short distance of (5,2).i never ran that much but I made it happen.the next day I was set and ready to get a longer distance then yesterday so i bend down touch my toes and stretch at the starting line so i would win i was determined to win,but i didn't and i only came in second with a distance of (6,7)I got really excited:that's more than yesterday I was really making progress.The next  few days i kept running long distances i ran (8,17)today and "(10,17) That was the longest distance ran in history! I was put in the year book and awarded fasts runner ever!

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the equation cos(35) =a/25 can be used to find the length of bc what is the length of bc? round to the nearest tenth

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