I do not understand question 3. PLEASE HELP! Due in 15 minutes! Please show work!

Solve the equation using the given values: x= -2.5; y= -7.51. 2xy + 2x²

The sales totals at macy's food store have increased exponentially over the months. which of these best shows the sales in the first three months?

Scores on the cognitive scale of the bayley-scales of infant and toddler development range from 1 to 19, with a standard deviation of 3. calculate the margin of error in estimating the true mean cognitive scale score, with 99% confidence, if there are 12 infants and toddlers in a sample.