What is the equation for this graph

Let r = 3. what is the value of r + 58?

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?

What is the 12th term of b(n)=-4-2(n-1)