Question

What is (3x10) + (6x1) + (9x1/10) + (4x1/100) in standard form

Answer 1

Standard Form just means in numbers e.g. 501.60

Writing this in huge spacing makes it easier for us:
3 * 10 + 6 * 1 + (9 * 1)/10 + (4 * 1) /100
30 + 6 + 0.9 + 0.04
= 36.94

Answer 2

30+6+0.9+0.04= 36.94