Respuesta :

Answer:4.5

Step-by-step explanation:

2 times 4.5=9.   9+1=10

so answer is 4.5

dspader

10=1+2a or 2a+1=10

A sum is the answer to an addition equation. 1 is being added to 2a. A number can be written as any letter in the alphabet(called a variable in math terms).

hope it helps!