D which is the last one 6z^3+z^2-9z+10
Answer:
960 were monochromatic
Step-by-step explanation:
2400x.40=960
The first digit of a number can be 1-9. The 2nd and the 3rd digit can be 1-10. The last digit can be 0 or 5 ( 2 numbers ):
9 * 10 * 10 * 2 = 1,800
She could pick 1,800 different 4-digit numbers.
