Настенные часы начинают бить каждые четверть часа. Сколько раз часы начинают бить за январь месяц?

СРОЧНО. НЕ ПОНИМАЮ

Решите систему уравнений и укажите наименьшуюю сумму х_k + y_k, где (x_k; y_k) - решение системы

x^2 + y^2 = 29

2x^2 - y^2 = 46

постройте график функции y=x^3+x^2/x+1 и определите,при каких значениях b прямая y=b имеет с графиком ровно одну общую точку.

Simple Present Exercise 01Change the verb into the correct form, then press "Check" to check your answers. Use the "Hint" button to get a free letter if you don't know. Note that you will lose points if you ask for hints!– 1. I usually (go) to school. 2. They (visit) us often. 3. You (play) basketball once a week. 4. Tom (work) every day. 5. He always (tell) us funny stories. 6. She never (help) me with that! 7. Martha and Kevin (swim) twice a week. 8. In this club people usually (dance) a lot. 9. Linda (take care) of her sister. 10. John rarely (leave) the country. 11. We (live) in the city most of the year. 12. Lorie (travel) to Paris every Sunday. 13. I (bake) cookies twice a month. 14. You always (teach) me new things. 15. She (help) the kids of the neighborhood.

Дан треугольник ABC. PK||AC. Найдите x. AC = 12 KP=4 PB=5 AP = x