Calculati : d. (3/1x4 + 3/4x7 + 3/7x10 + ... + 3/97x100) + (1/20x21 + 1 / 21x22 + ... + 1/79x80) =

Hi there!

So, first you have to do all the multiplication and division, then the addition.

Steps:

1. (3/4 + 3/28 + 3/70 + 3/9700) + (1/420 + 1/462 + 1/6320)

2. (0.9003092784 ...) + (0.004703682394 ...)

3. Answer = 0.9050129608

Of course for the actual answer your teacher may wanted it rounded.