18.

in 19 and 20, use the expression 5.3t - (20 + 4) + 11.

20

19. which part of the expression is a quotient?

describe its parts.

You could add six hundred seventy eight and three hundred three together by going right to left. three plus eight is eleven and so you carry the one and add the one with the seven and zero which is eight. finally, you add the six and three together which gives you nine. and you final answer is nine hundred eighty one
981