Algorithm for dividing decimals

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?

Jenisey has $24 to spend on seven pencils. after buying them she had $10. how much did each pencil cost.?

60 2(x + 2) in the diagram, gef and hef are congruent. what is the value of x?