X3-4x2- 25 has a factor (x-a)
1) find the value of a .
(2) Solve the equation x3-4x2- 25=0​

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60: 45 =12: 9 =4: 3 so the answer is 4: 3

add the numbers under frequency to find the total number:

5 + 8 +7 + 4 + 0 +1 = 25

the answer is 25.