a. Look at the figure above and then tell which graph(s) show the following correlation.
Positive correlation. ____________
Negative correlation_____________
No correlation___________
b. What kind of correlation is the following situation?
Number of gallons of gas in your car and the distance you can travel ___________________
Number of oranges you can eat and your height ___________________
Number of students going to a concert and the revenue generated.____________________
c. If a scatter plot shows a negative correlation, which line of best fit could represent the scatter plot?
A. y = x - 5 B. y = -1000x + 5000 C. y = 100x - 7 D. y = 5
12.
What is the equation of a line that has a slope of 3/5 and a y-intercept of 2?
A. 5y + 3x = 10 B. 5x - 3y = 10 C. 5y - 3x = 10 D. 5x + 3y = 10
13.
Triangle ABC has vertices (1,1), (3,5), and (5, 3). This triangle is dilated by a factor of 3. What are the images of the 3 vertices. Graph ABC and the image A'B'C'
14.
The diagonal of a square computer screen is 50 inches. What is the perimeter of this TV? ______________
15.
100 students take a survey to see what kind of ice cream people in America like to eat.
Which of the following will most likely flaw the survey?
A. Some students were not born in the United States
B. The students were not young enough
C. The survey may not include people who travel 50 miles to get ice cream
D. Choose students from a variety of schools.
16.
Which statement shows the similarity between the following 2 graphs?
4y = 2x + 0.5 and 4y = 5x + 1/2
A. The y-intercepts are the same
B. The graphs are identical
C. The x-intercepts are the same
D. The slopes are the same
17.
Below are 3 equations
1) 4x -2x + 1 = -1 + 2 + 2x
2) 2x - 2 = 6 - 4 + 4x
3) 5 + 3x = 2 + 3x + 5
Solve all equations and then say
Which equation has 1 solution _______________, no solutions _______________, infinitely many solutions ______________
18.
A tree is 8 feet tall and cast a shadow that is 6 feet. a. If your child's height is 4 feet, which equation can you use to find the length of his shadow?
a. Which proportion can you use to solve this problem?
A. 8/5 = 6/x B. 4/6 = x/8 C. 8/4 = 6/x D. x/4 = 8/6
b. What is the length of the shadow?_______________
19.
Solve the following silmultaneous equations.
2x + 4y = 8
4x - 4y = 6
a. by graphing
b. algebraically
20.
The cup below is 2/3 full. How much water can the cup hold? _____________
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