What is the best approximation of 6% tax on a $102 purchase? a. $6
b. $12
c. $18
d. $24​

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

Find the directions in which the function increases and decreases most rapidly at upper p 0p0. then find the derivatives of the function in these directions. f(x, y)equals=x squared plus xy plus y squaredx2+xy+y2, upper p 0p0left parenthesis 1 comma negative 4 right parenthesis

Sam opened a money-market account that pays 3% simple interest. he started the account with $7,000 and made no further deposits. when he closed the account, he had earned $420 in interest. how long did he keep his account open?