May someone please help me with this :)

Two sides of a triangle mesure 20cm and 30cm. what is the measure of the third side

Joe has some money in his bank account he deposits 45$ write an expression that represents the amount of money in joe's account

Acaterer charges $500 plus $30 per guest to cater a wedding. walt and traci don't want to spend more than $8000 on catering. write and solve an inequality in terms of the number of guests, g, that can be invited. a) 30g ? 8000; g ? 267 b) 500g < 8000; g < 16 c) 500 + 30g < 8000; g < 250 d) 500 + 30g ? 8000; g ? 250