сумма первых 10 членов арифметической прогрессии равна 50.Найдите разность прогрессии , если её первый член равен -4

Write the sentences a)in the negative b)in the interrogative.

1Grandparents go to church on Sunday. 2the birds sing in the park in spring. 3my mother cooks in the kitchen every evening.4his little sister likes to water flowers.5my father works in an office.6Bill stays at home every weekend.7his aunt usully reads detective stories.8our Granny takes the bus to the shop every day.