A study of elementary school children, aged 6 to 11, finds a high positive correlation between shoe size x and score y on a test of reading comprehension. The observed correlation is most likely due to
a. the effect of a lurking variable, such as age.
b. a mistake, since the correlation must be negative.
c. cause and effect (larger shoe size causes higher reading comprehension).
d. "reverse" cause and effect (higher reading comprehension causes larger shoe size).

Which expression is equivalent to the expression shown?

Which expression demonstrates the use of the commutative property of addition in the first step of simplifying the expression (-1+i)+(21+5i)+0

Tom is the deli manager at a grocery store. he needs to schedule employee to staff the deli department for no more that 260 person-hours per week. tom has one part-time employee who works 20 person-hours per week. each full-time employee works 40 person-hours per week. write and inequality to determine n, the number of full-time employees tom may schedule, so that his employees work on more than 260 person-hours per week. graph the solution set to this inequality.