Find the Missing term to complete the proportion ___ 1: 10: n = 5 : 4
___2: n = 5 : 4
___3: n : 4 = 9 : 6
___4: 3 : 8 = 9 : n
___5: n : 15 = 3 : 5

Help please

Can someone me with these questions ?

Does anyone know what my spanish teacher means by this? i need to use plural forms of the verb ser. and she asked me to use a couple of adjectives to describe the boys collectively and then the girls collectively?

Read and choose the right question for the blank. —tengo diecisiete años. o ¿cuándo es tu cumpleaños? ¿cuándo tienes 17? ¿cuántos años tienes? ¿cómo estás?