Elsa's grandmother paid her x dollars a week to mow the lawn during the summer. elsa decided to save some of her money and spend the rest. for the first 4 weeks, elsa put $10 per week into savings. for the next 8 weeks, she put $15 per week into savings.
pick all the expressions that represent how much money elsa spent.

4(x–10)+8(x–15)

(4x+8x)–(40+120)

12x–160

(4x–40)+(8x–120)

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) =