At scott's laundromat, the washing machines accept only quarters and nickels. if joe used 20 coins worth $2.60 to wash 4 loads, how many of each coin did he use

Determine the number of outcomes in the event. decide whether the event is a simple event or not. upper a computer is used to select randomly a number between 1 and 9 comma inclusive. event upper b is selecting a number greater than 4. event upper b has nothing outcome(s). is the event a simple event? (yes or no) because event upper b has (fewer than, exactly, more than) one outcome.

Find the solution of this system of equation -7x+y=-20 9x-3y=36

Which one ? is the answer and how to find this answer