Pls help with this i'll give brainliest and 15 points !!

Consider the function represented by the equation 1/2 j + 1/4 k equals 3 which shows the equation written in function notation with j as the independent variable

Evaluate the expression for the given value of the variable 7a - 4a for a =8

Select the margin of error that corresponds to the sample mean that corresponds to each population: a population mean of 25, a standard deviation of 2.5, and margin of error of 5%