Here is a number machine. Input
x 6
-7
Output
a) Work out the output when the input is 9
Here is a different number machine.
Input
+ 5
Output
When the input is 9, the output is 4
b) Complete the number machine.
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How do you solve a question like this?

Apsychology student wishes to investigate differences in political opinions between business majors and political science majors at her college. she randomly selects 100 students from the 260 business majors and 100 students from the 180 political science majors. does this sampling plan result in a simple random sample? why or why not? no, because each group of 200 students in the sample does not have the same chance of being selected. yes, because each group of 200 students in the sample has the same chance of being selected. no, because each individual student does not have an equal chance of being selected. yes, because each individual student has the same chance of being selected.

(x-5)1/2+5=2 what is possible solution of this equation