What is 4+12k= 52 equal?What is the answer

PLEASE HELP MEEE

Can someone me with this problem i don't understand i need

Yuto and hila attempted to solve the same inequality. their work is shown below. which statement is true about the work shown above? yuto is correct because he isolated the variable correctly and reversed the inequality symbol. yuto is incorrect because he should not have reversed the inequality symbol. hila is correct because she isolated the variable correctly and reversed the inequality symbol. hila is incorrect because she should not have reversed the inequality symbol.

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)