I need help on this asap

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?

Use set buikder notation to represent the following set: {, -2, -1, 0}

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).