Mod 7: Systems of Linear Equations
Mod 8/10: Polynomials
Mod 11: Quadratics
Mod 9: Exponentials & Mod 12: Statistics
Mixed Units
100
How many solutions does the system have?
One solution: (0,2)
100
Multiply.
(4a-5)(6a+5)
24a2-10a-25
100
Solve.
(4v-6)(8-v)=0
v=3/2, 8
or
v=6/4,8 (non simplified)
100
A deli sandwich is placed inside a cooler. As the sandwich cools, its temperature C(t) in degrees Celsius after t minutes is given by the following exponential function.
C(t)=27(0.87)t
Find the initial temperature.
Find the Growth/Decay percent.
Initial: 27 degrees Celsius
13% Decay (1-0.87=0.13)
100
How many solutions does the system have?
Infinitely many solutions
200
Solve the following system.
y - x = 15
x = 12
(12, 27)
200
Simplify.
(6v2+4)-(5v2-2v+1)
v2+2v+3
200
Solve the quadratic equation by graphing.
-x2+12x-27=0
x=3,9
200
Each of 6 students reported the number of movies they saw in the past year. This is what they reported.
{6, 15, 16, 20, 7, 12}
Find the median and mean. (round to the nearest tenth)
*order from LEAST to GREATEST
Median = 13.5 movies
Mean = 12.7 movies
200
A deli sandwich is placed inside a cooler. As the sandwich cools, its temperature C(t) in degrees Celsius after t minutes is given by the following exponential function.
C(t)=27(0.97)t
By what percent does the temperature change each minute?
Decaying by 3%
300
Solve the following system.
y=6x+12
y=x+47
(7, 54)
300
Rewrite without parentheses.
-2v3(3v3-8v+6)
-6v6+16v4-12v3
300
Solve for x.
x2-2x-15=0
x=-3,5
300
Suppose that the future price p(t) of a certain item is given by the following exponential function. In this function, p(t) is measured in dollars and t is the number of years from today.
p(t)=3200(1.025)t
Find the initial temperature.
Find the Growth/Decay percent.
Initial = $3,200
2.5% growth
300
Find the zeros of the quadratic function.
y=x2-16x+64
zero(s):8
or
x=8
400
Solve the following system of equations.
8x + 9y = 8
-3x + 5y = -3
(1, 0)
400
Rewrite without parentheses and simplify.
(6x-7)2
36x2-84x+49
400
Solve for y.
4y2-7y=2
x=-1/4,2
400
A laptop computer was purchased for $750. Each year since, the resale value has decreased by 23%.
Let t be the number of years since the purchase. Let y be the resale value of the laptop computer, in dollars.
Write an exponential function showing the relationship between y and t.
y=750(1-0.23)t
or
y=750(0.77)t
400
Use the quadratic formula to solve for x.
8x2-7x+1=0
x=0.70, 0.18 (rounded)
Exact answer below:
500
Solve the following system of equations.
-6x - 7y = -21
-3x - 8y = 3
(7, -3)
500
Factor completely.
3v2-24v+45
3(v-5)(v-3)
Also correct but not completely factored
(3v-15)(v-3)
(v-5)(3v-9)
500
Use the quadratic formula to solve for x.
3x2=3x+7
x=2.11, -1.11 (rounded)
Exact answer below:
500
The table of ordered pairs (x,y) gives an exponential function.
Write an equation for the function.
y=9(1/6)x
500
Larger IQR?
Smaller RANGE?
LOWEST noon temperature?
MORE noon temperatures below 81oF?
Larger IQR: City A
Smaller RANGE: City A
LOWEST noon temperature: City A
MORE noon temperatures below 81oF: same (both 75%)