I think that the grandson is 14 and the granddaughter is 12.
Hey there!
It's the distributive property, which states that:
a(b + c) = ab + ac
And that's exactly what was used here. 2(2x - 3) was simplified to 2(2x) - 2(3)
= 4x - 3
Hope this helps!
You'd have to regroup twice.
Since 26 is bigger than 13, you'd need both the tens and ones places to go up by ten in order to subtract properly.
To figure this out, divide 50 metres by 10 metre intervals
50 metres ÷ 10 metre intervals = 5 intervals