3 – If r = -1 and frist term is 1/2 find the sum of the 10 terms of a Gp(adsbygoogle = window.adsbygoogle || []).push({});

4 - Use mathematical induction to prove that 2 + 4 + 6 ……..+ 2n = n(n+1)

5 – Expand ( 2x – 3y)^4 by using binomial formula

Notice :

D. Mark i can't type my work into the text entry box. i put it in attachment i'm very sorry

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: I want check my answer

**Physics Forums | Science Articles, Homework Help, Discussion**