Can somebody help with Grade7math ? It’s like about dividing integers...

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?

Which recursive formula can be used to determine the total amount of money earned in any year based on the amount earned in the previous year? f(n+1)=f(n)+5

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles