Solve this plz extra points this time

Two blends of tea are mixed to make a blend that will be sold at the fair. black tea sells for $2.20 per pound and orange pekoe tea sells for $3.00 per pound. how much of each should be used to obtain a 4lb blend selling for $2.50 per pound?

Abacteria population is tripling every hour. by what factor does the population change in 1/2 hour? select all that apply

When is g(x) = 0 for the function g(x) = 5.23x + 4?