Need . don't have a calculator.

find the sum of the first n terms
1+-2+4+-8+16+-32+ (10 terms)

formula: a-a*r^n / 1-r

Do 12/14 and 8/10 have the same value? explain your answer.

The fraction 7/9 is equivalent to a percent that is greater than 100%. truefalse

The evening newspaper is delivered at a random time between 5: 30 and 6: 30 pm. dinner is at a random time between 6: 00 and 7: 00 pm. each spinner is spun 30 times and the newspaper arrived 19 times before dinner. determine the experimental probability of the newspaper arriving before dinner.