Answer:
 0, 5, 10
Step-by-step explanation:
You can solve the inequality to determine what values to select.
 28 -7x ≤ -4(-7x -7) . . . . . . given
 28 -7x ≤ 28x +28 . . . . . . eliminate parentheses*
 -7x ≤ 28x . . . . . . . . . . . . . subtract 28 from both sides
 0 ≤ 35x . . . . . . . . . . . . . . add 7x to both sides
 0 ≤ x . . . . . . . . . . . . . . . . . divide by 35
So, all values that are 0 or greater will make the inequality true:
 0, 5, 10
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* Parentheses are eliminated using the distributive property. The factor outside parentheses multiplies each of the terms inside. Pay attention to signs.
 -4(-7x -7) = (-4)(-7x) +(-4)(-7) = 28x +28
