Question 1

A student plotted the data from a sleep study as shown in the graph below.

Accepted Answer

The average number of hours of sleep per day decreases 0.09 hour per year of age.

Answer

The average number of hours of sleep per day decreases 9.24 hours per year of age.

Answer

The average number of hours of sleep per day increases 0.09 hour per year of age.

Answer

The average number of hours of sleep per day increases 9.24 hours per year of age.

Question 2

Which expression is equivalent to  $16x^4 - 64$ ?

Accepted Answer

$ (4x^2 + 8)(4x^2 - 8)$

Answer

$ (4x^2 - 8)^2$

Answer

$(8x^2 - 32)^2$

Answer

$(8x^2 + 32)(8x^2 - 32)$

Question 3

Which value would be a solution for x in the inequality $47- 4x < 7$ ?

Accepted Answer

11

Answer

-13

Answer

10

Answer

-10

Question 4

Bella recorded data and used her graphing calculator to find the equation for the line of best fit.  She then used the correlation coefficient to determine the strength of the linear fit.  Which correlation coefficient represents the strongest linear relationship?

Accepted Answer

0.9

Answer

0.5

Answer

-0.8

Answer

-0.3

Question 5

The solution to the equation  $4(x - 7) =0.3(x + 2) + 2.1$ is

Accepted Answer

8.3

Answer

8.7

Answer

3

Answer

-3

Question 6

A construction worker needs to move 120 $ft^3$ of dirt by using a wheelbarrow.  One wheelbarrow load holds 8 $ft^3$ of dirt and each load takes him 10 minutes to complete.  One correct way to figure out the number of hours he would need to complete this job is

Accepted Answer

$\frac{120 ft^3}{1}$ x$\frac{1 load}{8 ft^3}$x$\frac{10 min}{1 load}$x$\frac{1 hr}{60  min}$

Answer

$\frac{120 ft^3}{1}$x$\frac{1 load}{10 min}$x$\frac{8ft^3}{1 load}$x$\frac{1 hr}{60 min}$

Answer

$\frac{120 ft^3}{1}$x$\frac{60 min}{1  hr}$x$\frac{8 ft^3}{10 min}$x$\frac{1}{1  load}$

Answer

$\frac{120 ft^3}{1}$x$\frac{10 min}{1 load}$x$\frac{60 min}{1  hr}$x $\frac{1 load}{8 ft^3}$

Question 7

One characteristic of all linear functions is that they change by

Accepted Answer

equal differences over equal intervals

Answer

unequal differences over equal intervals

Answer

equal factors over equal intervals

Answer

unequal factors over equal intervals

Question 8

State whether $7 - \sqrt2$ is rational or irrational. Explain your answer.

Accepted Answer

Irrational.

Question 9

If $ f(x) = x^2   and g(x)  = x$, determine the value(s) of x that satisfy the equation $f(x) = g(x)$

Accepted Answer

x = 0 and x = 1

Question 10

The function $r(x)$ is defined by the expression  $x^2 + 3x - 18$. Use factoring to determine the zeros of r(x)

Accepted Answer

$(x+ 6)(x- 3)$  $x = -6$ and  $x = 3$

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