The first one is true
4(4a+10) is
16 a + 40 after distribution
The second one is also true
2(8a+20)
16a + 40 after distribution
Third is not true
4a(4+10a)
16a + 40a^2 after distribution
Last one is also true
8(2a+5)
16a + 40 after distribution
Hope this helps :)
