Answer:
y = 0.7(x^2 - 64x - 576)
Average rate of change = -49.
Step-by-step explanation:
As the x intercepts are -8 and 72 we can write the equation
y = a(x + 8)(x - 72) where a is some constant to be found.
As it passes through point (62, -490) we have, substituting:
-490 = a(62+8)(62-72)
-490 = - 700a
a = 0.7
So the equation of the parabola
y = 0.7(x + 8)(x - 72) or
y = 0.7(x^2 - 64x - 576).
Average rate of change between x = -8 and x = 2
= [0.7(2+ 8)(2 - 72) - 0.7(-8+8)(-8-72)] / (2 - -8)
= -490 - 0 /10
= -49
Answer:
13 ink cartridges
Step-by-step explanation:
18×13=234
Answer:
Part 1:
$4.50 a months
12 months in a year
$4.50 * 12 months = $54 dollars a year
Part 2:
Mr.Simon would record this transcation as a " - " because the maintenances fees deducts from this saving account.
Answer:
let p = cost of 1 plain wrapping paper
let h = cost of 1 shiny rolls wrapping paper
Write an equation for each statement,
" Eugene sold 3 rolls of plain wrapping paper and 11 rolls of shiny wrapping paper for a total of $168 "
<em>3</em><em>p</em><em> </em><em>+</em><em> </em><em>1</em><em>1</em><em>h</em><em> </em><em>=</em><em> </em><em>$</em><em>1</em><em>6</em><em>8</em><em> </em>
<em>Jill </em><em> sold </em><em>1</em><em>0</em><em> </em><em> rolls of plain wrapping paper and 1</em><em>1</em><em> </em><em>rolls</em><em> of </em><em>shiny </em><em> wrapping paper for a total of </em><em>$</em><em>2</em><em>5</em><em>2</em><em>."</em>
<em>1</em><em>0</em><em>p + 1</em><em>1</em><em>h = </em><em>$</em><em>2</em><em>5</em><em>2</em><em> </em>
Use elimination here,
10p + 11h = $252
3p + 11h = $168
subtraction eliminates h, find p
7p = $84
p = 84/7
p = $12 for wrap of plain paper
Find h using the 1st original equation
3(12) + 11h = 168
36+ 11h = 168
11h = 168 - 36
11h = 132
h = 132/11
h = $12 for shiny wrapping paper
Therefore each plain wrapping paper costs $12 and each shiny wrapping paper costs same $12 !
Move everything to one side, it becomes negative
3x+4-4x-5
=-x-1