Somebody please help!

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

Write an inequality for this description. - one fourth of the opposite of the difference of five and a number is less than twenty.

Olga bought a new skirt that cost $20. sales tax is 5%. how much did olga pay, including sales tax? 7.