Long-sleeve T-shirts cost $12.99; short-sleeve T-shirts cost $9.98. During one day, 90 shirts were sold for a total of $1,012.58. Let 3 represent the number of long-sleeve T-
shirts and y represent the number of short-sleeve T-shirts.
Identify the equations that represent the given information accurately. Select all that
apply
+y=1,012.58
12.99a +9.98y = 1,012.58
x+y=90
12.99x + 9.98y90
12.99x9.987
Question 2
1 pts

What situation is an example of an observational study

Alarger number is double the sum of a smaller number. the larger number is 2 less than 3 times the smaller number. if y represents the larger number and x represents the smaller number, which equations model the situation

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) =