You need to give options for future reference
b...............................................................................
Answer:
The answers I got might not be right but:
47. Equation: (3x)-(7+5x)=25 x= -16
48. Equation: x÷(-3+6)=9 x=37
16.15 because 33,60-1.30 is 32.30. 32.30 divided by 2 is 16.15
The critical values for a 90% confidence interval are approximately
![\pm1.645](https://tex.z-dn.net/?f=%5Cpm1.645)
, so the confidence interval in this case is roughly