Need serious help PLEASE!!!!!!!! ALGEBRA II?

Sn=a1(1-r^n)/1-r use the formula to evaluate the series 1.) 1+2+4+8+...+a10 2.) -3+6-12+24-...-a7 3.) 6+2+2/3+2/9+...+a6 (round to the nearest hundredth) 4.) 1-2+4-8+…-a10 1.) Does the following infinite series converge or diverge? Explain your answer. 7+28+112+448+… a.) It diverges; it has a sum b.) It converges; it has a sum c.) It diverges; it does not have a sum d.) It converges; it does not have a sum. 2.) Does the following infinite series converge or diverge? Explain your answer. A. it diverges; it has a sum B. it converges; it does not have a sum C. it diverges; it does not have a sum D. it converges; it has a sum 3.) Does the following infinite series converge or diverge? Explain your answer. 3/2+12/2+48/2+192/2+… a.) it diverges; it has a sum b.) it converges; it has a sum c.) it converges; it does not have a sum d.) it diverges; it does not have a sum