The table shown below gives the estimated number of text messages sent in the U. S. by year.
Approximately how many times as many text messages were sent in the U. S. in 2011 as in 2005?

2005-118,000,000,000
2011-2,357,000,000,000
convert to scientific notation.

A. 2 · 10 to the 1 power
B. 4 · 10 to the 1 power
C. 2 · 10 to the 3 power
D. 4 · 10 to the 3 power

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class

Which of the following expressions cannot be simplified to x – 2?

Atest of sobriety involves measuring the subject's motor skills. a sample of 31 randomly selected sober subjects take the test and produce a mean score of 64.4 with a standard deviation of 2. a claim is made that the true mean score for all sober subjects is equal to 65. for each part below, enter only a numeric value in the answer box. for example, do not type "z =" or "t =" before your answers. round each of your answers to 3 places after the decimal point. (a) calculate the value of the test statistic used in this test. test statistic's value = (b) use your calculator to find the p-value of this test. p-value = (c) use your calculator to find the critical value(s) used to test this claim at the 0.2 significance level. if there are two critical values, then list them both with a comma between them. critical value(s) =