разобрать слово древнейших как часть речи

Выбери нужную форму глагола в  Present Continuous or Present Perfect.

                1.  Wait for me a little. I (am eating, have eaten) my breakfast now. 2. Nick (is writing, has written) a letter. When he finishes, we shall go to the post office. 3. Mary (is putting, has put) plates, forks, knives and cups on the table, so we shall have dinner. 4. Look at the child. He (is carrying, has carried) a basket full of plums. 5. Bob (is washing, has washed) his hands and is ready to help you with the dinner. 6. The family just (is having, has had) tea. 7. It is 12 o’clock. Vladimir Petrovich (is having, has had) his lunch. 8. We already (are doing, have done) this exercise. Shall we read the text? 9. Tom’s sister (is learning, has learnt) the English rhyme and now she may go for a walk with her friends. 10. I just (am walking, have walked) through the field.

49 в 4 степени умножить на 7 в 5 степени и делить на 7 в  12 степени

сторона треугольника7,8см.Она на1,4см меньше второй стороны треугольника в 2 раза меньше третьей. Чему равен периметр треугольника?