Please help if you hurry I’ll mark brainliest

store a

Step-by-step explanation:

if u look at the square feet to price on both u can see that store A go's up slower that graph B

Diego's age is 14 years.

His sister's age is 19 years.

Step-by-step explanation:

Let d represent Diego's age.

We have been given that Diego's sister is twice his age minus 9 years.

The age of Diego's sister would be .  

We are also told that she is also as old as half the sum of the ages of Diego and both of his 12-year-old twin brothers. We can represent this information in an equation as:          

Let us solve for x:

Therefore, Diego's age is 14 years.

Therefore, his sister's age is 19 years.