If you're asking what it means,
the ballet dancer (or just dancer).
The arms.
The sentence seems incomplete. So i woulds think it's La bailarina en los brazos
1: A stem change verb is a verb that also makes the change in the stem
2: I'm not sure what this one is i'm sorry
3: -empezar is e-ie
-poder is o-ue
- pedir is e-i
4: i'm very sorry I don't know this one either... I'm just looking at a paper I got in my spanish class for all of the answers
5: there are four types of stem-changing verbs
>o-ue
>e-ie
>e-i
>u-ue
21 mal
22 enferma
23 pasa
24 duele
25 grasa
26 mejor
27 acostarte
28 levantar
29 mantenerte
30 lavarme