If a line was drawn perpendicular to one whose equation is 4x+2y=11, then its slope would be which of the following?
(1) -(1/2)
(2) 2
(3) 1/2
(4) -4

Two customers went to a post office. first customer paid $12 for 14 and 5 envelopes the second paid 24.80 for 10 postcards and 15 envelopes. what is cost of each envelope?

Write the equation in logarithmic form m^x=n

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.