Sum means adding so the sum is 645 + 10 = 655. Hope it helped!
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645
The sum of the first 10 multiples of 3 is 165.
the sum of 10 and the product of 7 and a number 2+5=7 2*5=10
Sum of exterior angles = 360 degrees Sum of interior angles = 1440 degrees
7x + 10