Functions
when you see f(x), what letter does this represent ?
Y
the average is called what in statistics ?
mean
How do you write 12.5% as a decimal ?
.125
if a line is horizontal, what is it's slope ?
zero
Y = mx + b
What does the m represent ?
what letter represents the domain ? what letter represents the range ?
X = domain; Y = range
the most frequent number in a list of numbers is called what ?
Mode
Shelly measures the dimensions of her bedroom so she can buy new carpet, which set of dimensions for Shelly's carpet is most reasonable.
A. 12 feet by 10 feet
B. 60 inches by 36 inches
C. 20 meters by 18 meter
D. 100 centimeters by 80 centimeters
Answer: A. 12 feet by 10 feet
if a line is completely vertical, what is it's slope ?
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Y = mx + b
What does the b represent ?
b = the y intercept
A sequence is shown:
3,6,12,24,48, which function represents the nth term of the sequence where f(1) = 3
A. 2*3^n-1
B. 3*2^n-1
C. 3*2^n
D. 6^n
Answer B. 3*2^n-1
the middle number in a list of numbers is called what ?
Median
Three pizza restaurants, cost of a pizza and deliver fee:
Restaurant Q: 17.49x + 2.50
Restaurant R: 15.99x + 3.50
Restaurant S: 16.50x + 2.99
Which restaurant has the least expensive pizza and which has the lowest delivery fee ?
least expensive pizza: Restaurant R
lowest delivery fee: Restaurant Q
in the equation, y = 2x - 1, what does the 2 represent ? what does the -1 represent ?
slope and y intercept
The name of a triangle that has 2 equal sizes
Isosceles
f(x) = 30x + 25
What does the 30 represent ? what does the 25 represent ?
30 represents the monthly membership fee, the 25 represents the initial fee
What is the formula for the range of a set of numbers ?
Maximum number - minimum number
Use a calculator
f(x) = 2^x + 3
What is the value of f (-2) ?
2^-2 + 3 equals 3.25
two raised to the negative two is .25, then add 3.
How would you describe these two lines ?
y = 2x + 1
y = 2x + 3
Parallel (slope is the same)
The name of a triangle that has zero equal sides
Scalene
A descending hot air balloon moves downward at a steady rate, if we write an equation to represent as: -375x + 1,500. What does the -375 in the equation represent in this context ?
the rate of decent of the hot air balloon
if you flip a coin 10 times and it comes up heads each time and you flip the coin again, what are the odds for the 11th flip it comes up heads ?
50%
The population of a town has grown by an average of 2,000 people per year over the last 10 years. Which equation represents this scenario ?
A. y = 25,000x + 2,000
B. y = 2,000x +25,000
C. y = -25,000x + 2,000
D. y = -2,000x + 25,000
Answer is B: 2,000x + 25,000
How would you describe these two lines ?
y = 2x + 1
y = -1/2x + 1
What does the r represent ?
r = radius