Transcript day6_032311

Mathematics Enrichment
DAY 6
TOTAL
This is dividing by the ticket prices NOT the TOTAL.
This is MULTIPLYING
AVERAGEby
= the
add TOTAL.
and divide by the
total
The variables are with the WRONG amounts.
STEP 1: Get rid of answer choices that do NOT show the division by the TOTAL.
STEP 2: Now that you only have 2 answer choices left, check the variables.
STEP 3: ADULTS is represented by which variable?
X=
Adults
STEP 4: CHILD is represented by which variable?
Y=
Children
Therefore, tickets cost $8.50X and $5.25Y
This is NOT subtracting $9.95 per movie.
This is NOT subtracting $9.95 per movie.
STEP 1: Let’s make a table to see what’s going on when Lara sees a movie.
MOVIE
0
BALANCE
$100
Lara receives the card.
Lara sees the 1st movie & $9.95 is deducted from the card.
1
100-9.95=90.05
2
90.05-9.95=80.10 Lara sees the 2nd movie & another $9.95 is deducted.
3
80.10-9.95=70.15 Lara sees the 3rd movie & another $9.95 is deducted.
STEP 2: By now, you can see that $9.95 is deducted from the card every time Lara
sees a movie. Get rid of answer choices that do NOT show this subtraction.
STEP 3: Now decide whether $9.95 should be multiplied by n or b.
Remember, b =
balance on card
Remember, n =
number of movies
STEP 1: They are asking for a VARIABLE. Get rid of
answer choices that have numbers. A number is NOT
a VARIABLE!
STEP 2: When you see a problem like this, think of the pneumonic device
DRY MIX.
d
o
D R
Y
I
X
M
e a
n
a
p n
d
i
e g
e
n
n e
p
d
e
e
n
n
t
t
So, looking at y = 3x+5, the dependent variable is “y”.
Cost per field
$40 per day
$40 lights
$30 set up
Cost per field
$40 per day
$40 lights
$30 set up
Cost per field
$40 per day
$40 lights
$30 set up
Besides the above costs per field, there is a $10 cost for parking and a $10 reservation fee.
What is the best way to find the TOTAL cost?