What is 4 to the negative 2 power? what's the answer and how do you do it?

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.

You buy a veido game for $60 and the sales tax is 8% what is the total cost for the game including the sales tax

Savannah had 40 iris blooms last year this year she had 15% more iris blooms how many more hours blooms did savannah have this year