8,000,000 + 300+ 9 in standard form

Asalesperson earns $320 per week plus 8% of her weekly sales. the expression representing her earnings is 320 + 0.08x. which of the following describes the sales necessary for the salesperson to earn at least $1000 in the one week?

This race was first held in 1953 on august 16th. every decade the race finishes with a festival. how many years is this?

You paid 28.00 for 8 gallons of gasoline. how much would you pay for 15 gallons of gasoline?