7,-28,112,-448 what is the next 2 numbers

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?

Somone me i want to know what 18 hours out of 24 hours in a fraction

What numbers are included in the set of integers? what numbers are not included?