Of the students at Washington Middle School, 320 signed up for the school picnic. That was 80% of all the students in the school. How many students attend Washington Middle School?

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?

Can someone me and plz do the problem

Prove that quadrilateral is a rhombus.