John had a rock that weighed 128 kg. The scale he used to weigh the rock has a percent error of 2%. Which could be measured weights of the rock?

How do you solve a question like this?

Suppose you are going to graph the data in the table. minutes temperature (°c) 0 -2 1 1 2 3 3 4 4 5 5 -4 6 2 7 -3 what data should be represented on each axis, and what should the axis increments be? x-axis: minutes in increments of 1; y-axis: temperature in increments of 5 x-axis: temperature in increments of 5; y-axis: minutes in increments of 1 x-axis: minutes in increments of 1; y-axis: temperature in increments of 1 x-axis: temperature in increments of 1; y-axis: minutes in increments of 5

Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?