Answer:
32
Step-by-step explanation:
20% is the same thing as saying 0.20
0.20×40=8
40-8=32
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.
\left[x \right] = \left[ 6\right][x]=[6] totally answer
Answer:
He multiplied the radius by 2 instead of squaring it
