## Welcome to H3 Maths

Blog Support for Growing Mathematicians

### Don’t Stress over Sneaky Advertising

February21

The Sneaky Advert exercise is to get you thinking mathematically about some of the tricks that can be used by advertisers to trick you into thinking that there are some  great bargains to be had in the stores. Of course, sometimes there are. Other times, the sneaky adverts are to get customers in the door. For example, the add that states, “Up to 40% off” may mean that there is only one item that has the 40% off! Check out this website for more details and help with this homework.

by posted under Uncategorized | 4 Comments »

#### “Don’t Stress over Sneaky Advertising”

1. Annabelle Says:

thnx sir for that website
…………
in class next lesson can we plz go over and mark the hw book … if we have time and that doesnt interfere with the lesson to much
thanx
annabelle

2. Malcolm Quinlan Says:

I am having some trouble finding a sneaky ad.
I hope I can find one before maths tomorrow. 🙂

• h3maths Says:

Yes, we will go over the homework book solutions tomorrow (oops, I mean today)

• h3maths Says:

Thank for the question. I knew that you might find it difficult to locate a sneaky advert which is why I put up a link on the blog and handed out a great example in our last lesson. There is no assessment attached to finding the advert, but it will go towards your Term 1 Book Mark.

#### Post Support

NCEA Level 2 Algebra Problem. Using the information given, the shaded area = 9, that is:
y(y-8) = 9 –> y.y – 8y – 9 =0
–> (y-9)(y+1) = 0, therefore y = 9 (can’t have a distance of – 1 for the other solution for y)
Using the top and bottom of the rectangle,
x = (y-8)(y+2) = (9-8)(9+2) = 11
but, the left side = (x-4) = 11-4 = 7, but rhs = y+? = 9+?, which is greater than the value of the opp. side??
[I think that the left had side was a mistake and should have read (x+4)?]