The coffee counter charges ? $8.00 per pound for kenyan french roast coffee and ? $10.00 per pound for sumatran coffee. how much of each type should be used to make a 22 pound blend that sells for ? $9.00 per? pound?

11 lbs of each

Step-by-step explanation:

The last line (Blend) provides the equation that needs to be solved:

22(9) = 8x + 10(22 - x)

198 = 220 - 2x

-22 =  - 2x

11 = x

Kenyan: x  = 11

Sumatran: 22 - x  =  22 - 11   = 11

step-by-step explanation:

walter needs to make at least 5 more cookies but no more than 40. 5 ≤ x ≤ 40

step-by-step explanation:

20 ≤ x + 15 ≤ 55

subtract 15 from all parts

20-15 ≤ x + 15-15 ≤ 55-15

5 ≤ x ≤ 40

this means how many more cookies he has to make

walter needs to make at least 5 more cookies, but no more than 40 cookies; 5 ≤ x ≤ 40