First one: Same denominator so ((9-7x)+(x-4))/(x+7) Final answer: (5-6x)/(x+7)
Second one: Again same denominator so ((7x)-(11x))/(x-7) Final answer: (-4x)/(x-7)
Third one: Same denominator again, ((9x)-(14x))/(x+9) Final answer: (-5x)/(x+9)
Fourth one: Same denominator again, ((3x-4)-(x-9))/(x+6) Final answer: (2x+5)/(x+6)
Fifth one: Different denominators here, so we have to make them them same. We do this by multiplying the first fraction by 3/3 to get (3x-9)/(2x), so ((3x-9)+(x-4))/(6x) Final answer: (4x-13)/(6x)
Sixth one: This one is trickier, we have to multiply each by the others denominator, so ((11)*(x-2))/((x+9)*(x-2)) and ((3)*(x+9))/((x-2)*(x+9)) to get (11x-22)/(x^2+7x-18) and (3x+27)/(x^2+7x-18) Final answer: (14x+5)/(x^2+7x-18)
Last one: You can change the first fraction to 1/(x*(x-1)), then multiple the second fraction by (x-1)/(x-1) to get (x-1)/(x^2-x). Now add them. Final answer: (2-x)/(x^2-1)
In this problem 7 is 10% of Ben Franklin's age. To solve you must find what 100% percent of his age is. To do this multiply 7 by 10. You do this because 10% times 10 is equal to 100%. Therefore, his age is 70.