Answer:
-2.125
Step-by-step explanation:
Start by assigning a variable to this unknown number, let's go with x. If we know that 8 times this number plus 28 is equal to 11, we have our equation of 8x+28 = 11. Subtract 28 from both sides to get 8x = -17. Divide both sides by 8 to get our answer of -2.125
