Answer:
Question 19: 4(x+5)+3 = 4·x+4·5+3 (second option).
Question 20: (117.50-83.50)+6(22.50+3) = 34+6(25.50) --> (last option).
Third question:
375=x-28
x= 375+28
x= 403
Fourth question:
0.57, 0.66, 0.75, 0.84,...
0.66-0.57= 0.09 and 0.75-0.66= 0.09 and 0.84-0.75= 0.09
So, the next three terms are: 0.93, 1.02, 1.11