How do i solve this equation? i need a refresher on algebra.

If there are 12 moths and some have 31 days and others have 30 days how many have 28 days?

Consider circle h with a 3 centimeter radius. if the length of minor arc what is the measure of zrst?

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