Joe balances a stationary coin on the tip of his finger 20cm from the top of the table. How much work is Joe doing?

Which equation represents the model shown? a)1/3 divide 1/6 = 2 b)2/3 divide 1/6 = 2/18 c)1/3 divide 1/6 = 1/18 d)2/3 divide 1/6 =4

Can someone check if i did this correct. it’s number 4 if you’re wondering.

Find the common ratio of the sequence. -4, 8, -16, 32, a: -12b: -2c: 12d: -1/-2