hi please help im so confused, i'm doing an escape room, i have no clue what this means. here is the question also: "Solve for the values of E, F, G, and H, and then input the secret number to unlock this door!"

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?

Solve the given system of equations. 2y= -x+9 , 3x-6= -15

The roots of the function f(x) = x2 – 2x – 3 are shown. what is the missing number?