I’m not sure I only answer these for the points :)
You take one away from the 6 carry the 1 to the 0 making it 10. Then 10-6 is 4 and 5-3 is 2. After that put 2 on the tens place and 4 on the ones place
1) 8
2) 14.5*2=29
3) 7x+5=2*13, 7x+5=26, 7x=21, x=3
4)d(1)=2r,
if r increase 3 times, d(2)=2*(3r)
d(2)/d(1)=(2*3r)/2r=3,
so diameter increases 3 times
0.02375 uhhh write it out but there ya go
Size got it right because it’s multiplied by 100