The product of a and b is equal to 10 more than twice the sum of a and b. If b = 9, what is the value of b - a?	Pick one:
A) 2  B) 5  C) 7  D) 24  E) 35
ab= 10 + 2(a+b)   9a= 10+2a +18   7a= 28   a=4   b-a= 9-4= 
<gadget id="calculator">9-4</gadget>
<output>5</output>
5   5 is the answer
<result>B</result>
The product of a and b is equal to 10 more than twice the sum of a and b. If b = 9, what is the value of b - a?