Guys can u tell the properties of these

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?

Me n o w. i need t h i s. 10 points

Ntriangle abc, m∠a = 35° and m∠b = 40°, and a=9. which equation should you solve to find b?