Step-by-step explanation:
w = 3(2a + b) - 4
w = 6a + 3b - 4
6a = w - 3b + 4
a = 1/6 * (w - 3b + 4).
Answer:
<u>Decrease in number:</u>
<u>Percent decrease:</u>
about 8
Step-by-step explanation:20+5+7=32