Answer:
<h3>
Question 3</h3>
<em><u>First step</u></em>
√15x + 4 = 16
<em><u>Second step</u></em>
15x + 4 = 256
<em><u>Third</u><u> </u><u>step</u></em>
15x = 252
<em><u>Last</u><u> </u><u>step</u></em>
x = 16.8
<h3>
Question 4</h3>
<u>First <em>step</em><em> </em></u>
8x + 12 - 7 = 13
<u>Seco</u><u>nd</u><u> </u><u>step</u>
8x + 5 = 13
<u>Third</u><u> step</u>
8x = 8
<u>Last</u><u> </u><u>step</u>
x = 1
Hope this helps you