Which of the following is NOT equivalent to the equation a + 3b=5c – 9?

In the diagram below what is the approximate length of the minor arc ab

Express the following as a function of a single angle, cos(60) cos(-20) - sin(60) sin(-20)

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?