Please help with these practice problems

Kevin is an auto mechanic. He spends 3 hours when he replaces the shocks on a car and 2 hours when he replaces the brakes. He works no more than 36 hours a week. He routinely completes at least 4 shocks replacements and 6 brake replacements a week. If he charges $400 for labor replacing shocks and $300 in labor for replacing brakes, how many jobs of each type should he complete a week to maximize his income? Achain saw requires 7 hours of assembly and a wood chipper 3 hours. A maximum of 42 hours of assembly time is available. The prot is $190 on a chain saw and $250 on a chipper. How many of each should be assembled for maximum prot? Write the constraint below as a linear inequality. A candidate will spend no more than $7800 on radio and TV advertising. Each radio spot costs $130 and each TV ad costs $790. Let x be the number of radio spots and let y be the number of TV ads. Write the constraint below as a linear inequality. Acanoe requires 8 hours of fabrication and a rowboat 9 hours. The fabrication department has at most 119 hours of labor available each week. Let x be the number of canoes and let y be the number of rowboats