(sorry this is a repost, mods please delete the first one, thanks!)

If AR = 3x + 6, BC = x + 18, and RC = 7, then...

AR = ??

RB = ??

Which situation is an example of an observational study?

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) =

Which is the standard form for this number? (2 x 10) + (5 x 1) + (8 x 1 10,000 )