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a. Let Ken be represented by x
David = x+ 7
The sum of their ages x + x+7 =2x + 7
b. The sum of their ages 10 years to come
Ken = x +10
David = x+7 +10
Total sum =x +10 +x + 17
=2x +27 years
c. (x-4) (x +7 -4) =(x-4) (x+3)
=x^2- x - 12
joseph rimiru answered the question on October 22, 2017 at 05:08
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