Can someone help? Please show work! Pythagorean theorem and special right triangles

He amount of carbon-14 present in animal bones t years after the animal's death is given by p(t)equals=upper p 0 e superscript negative 0.00012097 tp0e−0.00012097t. how old is an ivory tusk that has lost 26% of its carbon-14?

45 was divided by a power of ten to get 4.5. what power of ten was it divided by? people 4.5

What rotation was applied to triangle def to create d’e’f’?