How many different combinations are possible can made by 2 numbers followed by 4 letters?

The expression 42 plus 57 shows how much money nate spent at a store .which expression also shows how much money nate spend

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?

What is the equation of a line that passes through points (0, 4) and (-4,-8)?