Can somebody PLEASE help me ??

Aword processing program requires a 7- digit registration code made up of the digits 1,2,4,5,6,7 and 9 each number has to be used and no number can be used mor than once how many codes are possible

How many solutions does the nonlinear system of equations graphed below have? a. one b. zero c. four d. two

Aright triangle has an area of 21 m2. the dimensions of the triangle are increased by a scale factor of 4. what is the area of the new triangle