This is a substitution problem so let’s try answer choice (1) first
2(6+2)^2 – 4 is way more than 28
Let’s try answer choice (2):
2(2+2)^2 – 4 = 28 YUP🙂
Since 2 works now we just have to see if -6 works as well:
2(-6+2)^2 – 4 = 28 YUP🙂
2 more points!!
OK back to our trusty TI-84. Let’s enter all 4 and find the odd man out!
Not only is one different than the others but it is the only one that LOST money.
If you put money into a savings account it should grow!!!
That’s it — 2 more points!!
Put j(x) into Y1 and try the other equations in Y2 then compare the Y1 and Y2 columns
Below is answers 1 and 2 which have the same equation, neither is a match!
Now we will try the equation for (3) and (4), see below:
So now we can see the match!
However, at x = -6, the y value is 115 and we are looking for -29, so it cannot be -6
At x = 6 below, you can see the y value is -29.
Also check out the symmetry of the y values and how the values are centered around (6,-29): this is what makes it the vertex or turning point.
We could also use the vertex form of a parabola but it has a tricky negative sign issue which these answer choices prey upon.
Using the graph feature of the TI-84 is also an option but since the normal viewing window is +/-10, -29 would be outside that window.
There are 50 people (30 + 12 + 8) in the 21-40 age group and 30 of them are for the candidate.
So that is 30 out of 50 or 30 divided by 50:
30/50 = x/100 notice how you can make equivalent fractions? (rather than
The first term is 4 : add 3 to find each successive term
so Term 2 = 7
Term 3 = 10 and so on
2 more points!!
Which comes first in the alphabet, x or y? d or r?
Domain means the x values and Range means the y values
So we’re gonna graph this and check out the y values:
Looking at the graph, the lowest y value is less than -1. which can also be seen in the table above.
This gets rid of answers (3) and (4).
Are the y values greater or less than -9?
That’s it, 2 points.