Since all of the intervals are two years, we just need to find the smallest change:
For answer (1), it changed 12 (from 11 to 23)
Answer (2), 17 (from 16 to 33)
Answer (3), 19 (from 23 to 42)
Answer (4), 14 (from 33 to 47)
That’s it — 2 points!!
This question is categorization and is easy to figure out with some close reading:
A fifth degree expression has a highest power of 5 so that takes out answers (2) and (3) leaving (1) and (4).
A leading coefficient of 7 is exactly what it sounds like — does answer choice (1) or (4) have a first term that starts with a 7?
A constant of 6 is 6 without any algebra or variables so find that to confirm your answer! :)
We can either recognize the factoring as DOTS Difference of Two Squares and see that the 16 would be 4 x 4 (not 8 x 8). Then by checking the signs of the remaining answers (3) and (4) we would see that answer (4) would give us a trinomial and not the binomial given.
Another way to do this would be to use the TI-84:
Here is answer (1) compared to the original expression, um, not a match!
Below is answer (2) compared to the original expression. Also not a match!!
And now to check answer (3) and from the table voila!! also we only see one graph which means the Y= are the same :)
A function has to have unique x values.
Look at
(1) 2 and 4 repeat repeat
(2) 0 repeats
(3) all unique
(4) 0 repeats
That’s it — 2 more points!
This is purely a reading problem!
How many years from when Krystal was 2 til she’s 18?
That number is the exponent leaving answer choice (1) and (2)
Then we have to ask ourselves is the account increasing or decreasing and that leads us right to the right answer!!
That’s it — 2 points!!!
Math Confidence by Robin the Math Lady 