Round off 4252 to one significant figure

65 8 7 4 5 6 8 4 3 2 1 9 5 6 4 2 1 6 5 1 5 1 3 2 3 5 multiply the third number in the first row by the seventh number in the third row. add this result to the fifth number in the second row. add to this total ten times the fourth number in the third row. subtract the eighth number in the first row from the result.

Write 17/20 as a decimal and as a percent.

If olu is twice as old as funmi if the sum of their ages is 60 how old is olu