Discuss the value that the Crest 3D 2 Hour Express tap into that the other Crest whitener strips do not.

Find the distance from (-1, 7) to the line x = 3.

How might radioactivity be used to locate a leak in an underground pipe?

Use the percent formula, A = PB: A is P percent of B. What is 18% of 40?

Athletes performing in bright sunlight often smear black eye grease under their eyes to reduce glare. Does eye grease work? In one study, 16 student subjects took a test of sensitivity to contrast after three hours facing into bright sun, both with and without eye grease. This is a matched pairs design. Here are the differences in sensitivity, with eye grease minus without eye grease:

$$\begin{array}{rrrrrrrr} 0.07 & 0.64 & -0.12 & -0.05 & -0.18 & 0.14 & -0.16 & 0.03 \\ 0.05 & 0.02 & 0.43 & 0.24 & -0.11 & 0.28 & 0.05 & 0.29 \end{array}$$

We want to know whether eye grease increases sensitivity on the average.

(a) What are the null and alternative hypotheses? Say in words what mean $\mu$ your hypotheses concern.

(b) Suppose that the subjects are an SRS of all young people with normal vision, that contrast differences follow a Normal distribution in this population, and that the standard deviation of differences is $\sigma$ = 0.22. Carry out a test of significance

Determine the $y$ coordinate of the centroid of the vertical stabilizer in previous problem.

Solve the inequality. Graph the solution set, and write the solution set in set-builder notation and interval notation.

$$-14<3(m-7)+7$$

David Wise handles his own investment portfolio and has done sofor many years.Listed below is the holding time (recorded to the nearest whole year) between purchase and sale for his collection of 36 stocks.What quantity would you use for the lower limit of the initial class.

$$\begin{array}{|rrrrrrrrrrrrrrrrrrrr|} \hline 8 & 8 & 6 & 11 & 11 & 9 & 8 & 5 & 11 & 4 & 8 & 5 & 14 & 7 & 12 & 8 & 6 & 11 & 9 & 7 \\ 9 & 15 & 8 & 8 & 12 & 5 & 9 & 8 & 5 & 9 & 10 & 11 & 3 & 9 & 8 & 6 & & &\\ \hline \end{array}$$

Flowing-water ecosystems originate from underground water sources in _.

If a set has 16 subsets, how many elements are in the set?

In an investigation of whiplash resulting from rear end collisions, sudden rotation of the head is modeled by using a homogeneous solid sphere of mass $m$ and radius $r$ pivoted about a tangent axis (at the neck) to represent the head. If the axis at $O$ is given a constant acceleration $\alpha$ with the head initially at rest, determine expressions for the initial angular acceleration $\alpha$ of the head and its angular velocity $\omega$ as a function of the angle $\theta$ of rotation. Assume that the neck is relaxed so that no moment is applied to the head at $O$.

In the following problem, solve for x.

$\sqrt2$ | 3x - 7 | = 54.9

Name a type of food in which convection helps the cooking process. Explain your answer.

Choose the correct term to complete each sentence.

The ratio of the change in y-coordinates to the corresponding change in x-coordinates is called the (slope, y-intercept) of a line.