Answer:
z = - .5
Step-by-step explanation:
z = (x - μ)/ σ
z = 56 - 60/8 = -.5
<h3>
Answer: 19</h3>
==========================================
Explanation:
The steps you have so far are correct. You just need to multiply both sides by -3
Doing so will clear out the fractions and you'll be left with 19 = x, which is the same as x = 19
Let's check that answer:

So the answer is confirmed.
You have to calculate the air, a=h*b/2 so the answer is d)
£40 by 20% = 40 * 0.2 = 8
So 40 + 8 = 48
<span>Increase £40 by 20% is 48</span>