The only research method that can identify cause-and-effect relationships between variables is

Experiment type research method

Step-by-step explanation:

Experiment type research method - In this type of research method , researcher take one or two objective as variable and  done experiment on the basis of subject taken and analyze the outcome of experiment.

in this method different parameter can applied to the selected variable , to which cause and effect can be analyze. one demerits of this method is sampling method

the inequality is:

250c+180g≥950

step-by-step explanation:

let c denotes the number of days in a week   miyoko worked as a cryptographer.

and g denotes the number of days in a week she works as a geologist.

now we are given that she earns $250 for every day she works as a cryptographer,and earns $180 for every day she works as a geologist.

now miyoko's goal is to earn more than $950 this week.

hence, the inequality could be represented as:

250c+180g≥950

the aswere is the one with all 8's and the second one is with the 10,8 and 6

step-by-step explanation: