Unit 1 & 2
Which of these is NOT an integer?
-12/3
negative square root of 64
-3.5
0
Simplify
-4/5(20+15x)
-12x-16
-3x-4<5
x>-3
What do the letters "x" and "y" mean to functions?
Domain & Range
What is slope intercept form? What does each part mean?
y=mx+b
m=slope
b=yintercept
x=how frequent/how far apart
y=equation of the line
Between what two numbers does the square root of 12 lie?
A) 4 and 5
B) 3 and 4
C) 2 and 3
D) 1 and 2
B!!!!
3 and 4
27+9x=5x+7 Solve for X
x=-5
Would I flip the sign? Why?
-3x>(or equal to) 12
yes, because you would have to divide by a negative number.
How do you know if something is a function?
"x" does not repeat. Each "x" has its own "y"
A) 3/4
B) 0x+3/4
C) 3/4x
D) 3/4y
C!!!!!!!!!
3/4x
Juan scored a 62 on his first math test. On the second math test, he scored 85. What is the percent of change in the number of points scored between the furst and second test?
37% INCREASE
Simplify the following
3x-2(x-8)-5
x+11
Joan needed $100 to buy a graphing calculator for her math class. Her neighbor will pay her $5 per hour to babysit and her Father gave her $10 for mowing the lawn. Write an inequality represents the minimum amount of hours she will need to babysit in order for her to buy her calculator?
5x+10>(or equal to)100
A) (-2,4), (-1,4), (0,4), (2,4)
B) (3,-2), (3,0), (3,1), (3,2)
C) (1,1), (2,2), (3,3), (4,4)
D) (-2,4), (6,3), (-1,2), (3,5)
B !!!!
(3,-2), (3,0), (3,1), (3,2)
A cell phone charges a montly fee of $60 and $0.05 for each text message sent. Write an equation to represent the relationship between the number of text messages sent, x, and the total cost, y.
y=0.05x+60
A bag contain an equal amount of yellow and black marbles. Adrian selects a black marble, does not replace it, and then selects a yellow marble.
Is this independent or dependent probability? How will not replacing the marble affect the probability of selecting a yellow marble second?
translate the following equations/expressions
a number increased by 9 is -5
a number decreased by 10
the product of a eleven and a number
half a number equals 3
x+9=-5
x-10
11x
1/2x=3
Solve 2(x+1)+4x<10 for x
x<4/3
What does DIXI and ROYD stand for?
Domain Input Xvalues/Vaxis Independent
Range Output Yvalues/Yaxis Dependent
You have the linear equation of y=-2/3x. If you are given a constant of +4. What change to the graph is true if the new linear equation is y=-2/3x+4?
A) the line will translate left 4 units
B) the line will translate up 4 units
C) the line will translate down 4 units
D) the line will translate to the right 4 units
B!!!
The line will translate up because the y-intercept is a positive 4
What would the graph for the following inequality look like?
-4/3(6x+21)+17>-43
Open or closed circle?
Which direction?
Final answer?
x<4
Open circle
going towards the left
translate the following equation and solve for x
Four times the quantity of a number decreased by one is triple the same number increased by 7
4(x-1)=3x+7
x=11
Translate the following inequality and solve for x
Ten times a number less than six plus three times the same number is at most negative one half of a number plus twenty
6-10x+3x<(or equal to) -1/2x+20
or 3x+6-10x <(or equal to) -1/2x+20
Mia is shopping for gifts for her family. As the number of gifts she buys increases, the amount of sales tax that she pays also increases.
What is the independent and dependent variables in this situation?
Independent:
the number of items she buys
Dependent:
the amount of sales tax
Write an equation for the following situation?
For membership, the gym charges a yearly flat fee of $30 and $10 per month for each month that you are a member.
The liner function should show the total cost, y, based on the number of months, x, you are a member. Assume there are no additional costs.
y=10x+30