Can someone help me with my spanish

Calcula la concentracion de hidronio en la lluvia ácida si el ph es 4.35

Present tense review review present tense conjugations of regular -ar verbs. complete the following sentences using the correct form of the verb given in parentheses. it may also to review the tutorial, earning and saving. type the correct answer in each box. spell all words correctly. example: yo ahorro mi dinero. (ahorrar - to save) ella dinero. (ahorrar - to save) nosotros dinero en el supermercado. (gastar - to spend) ¿tú ? (trabajar - to work) ellos en el restaurante. (trabajar - to work) yo 100€ del cajero automático. (sacar - to take out)

Fill the blank with a la, a las, a los, or al. mi padre .