Write algebraic expressions

item 3
michelle has x dollars. tony has nine fewer dollars than michelle.

275/20 simplified (lmbo it told me to add more characters)

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?

Find and simplify an expression for the area of five rows of x squares with side lengths of x centimeters.