4.2.4 Practice: Modeling: Slope-Intercept Equation of a Line

answer 1-12 pls fast

[10 points, algebra 2-simplifying complex fractions]according to my answer key the restrictions are -1 and 4. but why not positive 1?

What would be the reasons for lines 3 and 4? a. addition property; subtraction property b. addition property; solve c. substitution property; subtraction property d. substitution property; prove

Calculate the effective quarterly compound interest rate equivalent to a 1% of monthly compound interest rate.