Lana is the oldest of four sisters. her youngest sister is half her age. the other two sisters are twins $2$ years younger than lana. when the four sisters' ages are added together, the result is $45$. if the youngest sister is $n$ years old, what is $n$? lana is the oldest of four sisters. her youngest sister is half her age. the other two sisters are twins $2$ years younger than lana. when the four sisters' ages are added together, the result is $45$. if the youngest sister is $n$ years old, what is $n$?

Polygons efgh and e′f′g′h′ are shown on the coordinate grid: what set of transformations is performed on efgh to form e′f′g′h′? a. a translation 1 unit to the left followed by a 90-degree counterclockwise rotation about the origin b. a translation 1 unit to the right followed by a 90-degree counterclockwise rotation about the origin c. a 90-degree clockwise rotation about the origin followed by a translation 2 units to the right d. a 90-degree clockwise rotation about the origin followed by a translation 2 units to the left

Which best explains why this triangle is or is not a right triangle?

The areas of two similar triangles are 72dm2 and 50dm2. the sum of their perimeters is 226dm. what is the perimeter of each of these triangles?