If a+3b=10, what is the value of 2a+6b=?

Select the lengths in centimeters that would form a right triangle

Me complete this proof! prove that a quadrilateral is a square. me with the steps for this proof.

Meghan has created a diagram of her city with her house, school, store, and gym identified. a. how far is it from the gym to the store? b. meghan also wants to walk to get some exercise, rather than going to the gym. she decides to walk along arc ab. how far will she walk? round to 3 decimal places.