Mary's age is 2/3 that of peter's. two years ago mary's age was 1/2 of what peter's age will be in 5 years' time. how old is peter now?

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?

Haruka hiked several kilometers in the morning. she hiked only 66 kilometers in the afternoon, which was 25% less than she had hiked in the morning. how many kilometers did haruka hike in all?

How can you check that you have correctly converted frequencies to relative frequencies?