Nine fewer than half a number is five more than four times the number

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

Lola says these two expressions have the same value. expression a expression b which explains whether lola is correct?

Aculture started with 2,000 bacteria. after 8 hours, it grew to 2,400 bacteria. predict how many bacteria will be present after 19 hours . round your answer to the nearest whole number. p=ae^kt