HA1 - Review for Exam #2

Which of the following inequalities matches the graph here?

• 10 < x + 1

• 3 – 4x > -33

• 5x > 55

• 7 – 2x > -11

In making a graph of the solutions of the inequality

|4x – 2| > 26, the first step is to plot the boundary points of

the graph. The boundary points of this graph are:

• -6 and 7

• -5 and 6

• 4 and -1

• 6 and -4

If the slope of f(x) is 3 and f^-1(6) = 7, which of these is the equation for f^-1(x) ?

• f^-1(x) = 1/3x – 4

• f^-1(x) = 2x – 1

• f^-1(x) = 1/3x + 5

• f^-1(x) = 3x + 1

Based on the triangle below, which value represents a valid length for the third side of the triangle?

• 12

• 47

• 41

• 7

The sum of two numbers is 150. The first number is twelve less than the other. Which of the following systems of equations could be solved to find these two numbers?

• x = y + 150

  x + y = -12

• x + y = 150

  x = y – 12

• x = y + 150

  x = y – 12

• x + y = 150

  x – y = 12

Which of the following inequalities matches the graph below?

• |x – 50| > 7

• |x – 25| > 18

• |x + 50| < 7

• |x + 25| < 18

What is the slope of any line that runs perpendicular to the line 3x – 6y = 8 ?

• 0.5

• -0.5

• 2

• -2

Tags

CCSS.8.EE.B.5

What is the slope of any line that runs parallel to the line

2x + 5y = 10 ?

• -2.5

• 2.5

• -2/5

• 2/5

Suppose in a petri dish, there are 2 bacteria and that number triples every day. Which of the following functions gives the number of bacteria y in the dish after x days?

• y = 3 · 2^x

• y = 2 · 6^x

• y = 6 · 3^x

• y = 2 · 3^x

Which of these gives the nth term of the geometric sequence

5, 10, 20, 40, 80, . . . ?

• a_n = 5 · 2^{n – 1}

• a_n = 10 · 5^{n – 1}

• a_n = 5 · 10^{n – 1}

• a_n = 2 · 5^{n – 1}