HELP PLEASE

1. 5x + 7 = 2x + 16
2. 3x + 4 = 5x – 10

Rewrite the following without an exponent. (5/8)-1

What is the distance between point a and b

Look at the figure below: triangle abc is a right triangle with angle abc equal to 90 degrees. the length of ac is 5 units and the length of ab is 4 units. d is a point above c. triangle adc is a right triangle with angle dac equal to 90 degrees and dc parallel to ab. what is the length, in units, of segment cd?