21≥<span>3(a-7) +9 first, just solve it like a normal equation Distribute 21</span>≥3a-21+9 <span>Combine numbers 21</span>≥3a-12 <span>Solve like equation 33</span>≥3a 11≥a <span>"a" has to be less than or equal to 11 for the inequality to be true
Answer: To determine the charge on an object, determine the number of excess protons or excess electrons. Multiply the excess by the charge of an electron or the charge of a proton - 1.6 x 10-19 C.
