Answer:
a. 0.5
Step-by-step explanation:
We know that X follows normal distribution with
mean=75
standard deviation=8


P(0<Z<∞)
The area under the normal curve is 1 and the (0<Z<∞) =0.5 and (-∞<Z<0) =0.5
So, P(0<Z<∞)=0.5
Hence the P(X ≥ 75)=0.5
(r-s)/r=d would be the rule you use to find the discount when r= regular price and s equals sale price and d= discount
What you want to do is find the comon demominator and than go from rhere pluse you should be able to go and look back at the lesson if you dont get ut well its like that for me
-6 + 2(9a + 5)
-6 + 18a + 10
18a + 4
Hope this helps!
Brainliest is much appreciated!