Help with math assignment 2

Olga bought a new skirt that cost $20. sales tax is 5%. how much did olga pay, including sales tax? 7.

In the diagram below, abc is congruent to dec what is the value of x

The lengths of two sides of a triangle are 9 and 15. what can be said about the length of the third side? a. it must be greater than or equal to 6 and less than 24. b. it must be greater than or equal to 6 and at most 24. c. it must be greater than 6 and less than 24. d. it must be greater than 6 and at most 24.