A teacher selects 2 different numbers, "a" and "b", and states that a + b = 0. Which of the
following statements could be true about these
2 numbers?
a. Both numbers are positive
b. Both numbers are negative
C. One number is zero and the other is
positive
d. One number is positive and the other is
negative
Support your answer by giving an example!

Factor the polynomial. b^2 + 4b + 4

Acell phone company offers two plans to its subscribers. at the time new subscribers sign up, they are asked to provide some demographic information. the mean yearly income for a sample of 40 subscribers to plan a is $45,000 with a standard deviation of $9,200. for a sample of 25 subscribers to plan b, the mean income is $64,300 with a standard deviation of $7,100. at the 0.025 significance level, is it reasonable to conclude the mean income of those selecting plan b is larger? assume unequal population standard deviations. hint: for the calculations, assume the plan a as the first sample. what is the decision rule? (negative amount should be indicated by a minus sign. round your answer to 3 decimal places.) compute the value of the test statistic. (negative amount should be indicated by a minus sign. round your answer to 2 decimal places.) what is your decision regarding h0 ? reject h0 fail to reject h0 compute the p-value. less than 0.01 between 0.01 and 0.025 between 0.025 and 0.05 between 0.05 and 0.10 greater than 0.10

The associative, commutative, and distributive properties can be used on rational equations. true or false