Which transformation will map an isosceles trapezoid onto itself?

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4

Due to financial difficulties the owner of 4 skateboard stores is going to close 2 of his stores. based on the money earned at each store, which two stores should remain open?

What is r i 4.5+10r=-6.5 with work pls