How to find perimeter of a octagon that has diagonals of 1.4cm

How do you convert 1.27 to a percentage

What effect would doubling all the dimensions of a triangular pyramid have on the volume of the pyramid? explain your reasoning.

Janie has $3. she earns $1.20 for each chore she does and can do fractions of chores. she wants to earn enough money to buy a cd for $13.50.