Find the angle between the given vectors to the nearest tenth of a degree u=<8 , 7 > , v=<9,7>

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?

∆red ≅ ∆ by rule will give brainiest if possible

Which of these lines passes through the point (1,-1) and has a slope of -3?