Terrific Turtles

Congratulations, you solved the problems and played with the cutest frog ever! Since it's Friday and almost the weekend, the first mate only has three problems for you to help him with today. And he is getting out his turtles to show you. The first is his Mata Mata turtle which is a female he name Greta Greta.

Solve the problems below to see his other turtle which uses a clever camouflage technique.

Good luck!

Use symbols *, / & ^ for multiplication, division & power.
Put numbers first, then variables.
Use parentheses only when necessary.
For example: 23*x^2/(7*y)

Problem 11:

Problem 12:

Problem 13:

Solve these problems to see the amazing turtle!
 

Mary River Turtle with algae growing on its head.