Question

Change the adjective below to a superlative by adding the appropriate ending (ísimo). bella (3 points)

Answer 1

In order to change the adjective into the superlative form in Spanish, it is necessary to add syllables and modify the ending of the adjective, but you need to pay attention to the subject to respect the gender. 

The adjective is BELLA so you have BELLISIMO and BELLISSIMA.
For example: El cuadro es bellisimo ( cuadro and bellesimo male gender)
La historia es bellisima (historia and bellisima female gender)

You might have number changes as well when using the plural. BELLISIMOS/ BELLISIMAS. 

Answer 2

bellísima - You can add -ísimo to an adjective and even some adverbs to talk about an extreme degree of something. This  suffix may be translated as very, really, extremely, super, and quite.

you also have to pay attention to the La, El, Ud. etc