Question

If a*b means 2a + b , then what is 2*5 ?

Answer 1

To solve this problem you must apply the proccedure shown  below:

If $(a)(b)=2a+b$, you have that:

$(2)(5)=(2)(2)+5=9$

Because $a=2$ and $b=5$

Therefore, as you can see, the answer is: $9$

Answer 2

Answer

9

Explanation

a*b ⇒ 2a + b

2*5 ⇒ ?

Comparing a*b and 2*5, we can say that;

a = 2    and

b = 5

So, substituting a with 2 and b with 5 in the equation 2a + b we have,

a*b   ⇒ 2a + b  

2*5  ⇒ 2(2) + 5

        ⇒ (2×2) + 5

      ⇒ 4 + 5

      ⇒ 9