A pharmacist needs to combine a mixture for a patient. She uses 5 mg of antibiotic for 25 mg of the mixture. If the patient needs 100 mg of the mixture, how much antibiotic should the pharmacist use?
20 mg
30 mg
80 mg
120 mg
500 mg

20 mg

Step-by-step explanation:

5/25 mg

multiply 25 by 4 to get 100 so also multiply 5 by 4 to get 20 mg of the antibiotic.

a) y = -3x +2

b) y = 1/2x -6

these 2 can be combined into one equation.

-3x +2 = .5x -6

8 = 3.5x

x = 8 / 3.5 = 2.2857142857

y = -3 * (8 / 3.5) +2

y = (-24 / 3.5) + 2

y = -4.8571428571

step-by-step explanation:

if you was gonna solve for a, a is a   < -12