Q20: Subtract.<br>-Subtract <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB8475/.jpg" alt="Subtract. -Subtract
Q21: Express the number in scientific notation.<br>-0.000639<br>A) <img
Q22: Simplify.<br>-<img src="https://d2lvgg3v3hfg70.cloudfront.net/TB8475/.jpg" alt="Simplify. - A)
Q23: Divide.<br>-<img src="https://d2lvgg3v3hfg70.cloudfront.net/TB8475/.jpg" alt="Divide. - A) 6x
Q24: Multiply using a special product formula.<br>-(5a +
Q26: Simplify.<br>-<img src="https://d2lvgg3v3hfg70.cloudfront.net/TB8475/.jpg" alt="Simplify. - A) 7
Q27: Subtract.<br>-(7z - 4) - (-z + 2)<br>A)
Q28: Multiply.<br>-<img src="https://d2lvgg3v3hfg70.cloudfront.net/TB8475/.jpg" alt="Multiply. - A)
Q29: Multiply.<br>-<img src="https://d2lvgg3v3hfg70.cloudfront.net/TB8475/.jpg" alt="Multiply. - A)
Q30: Solve the problem.<br>-A particle is observed moving