Barb had $10 in her bank account. She used her debit card to pay $41 for dinner. What is the new balance of her bank account after the $41 is deducted? $31
-$31
$51
-$51

Abacteria population is tripling every hour. by what factor does the population change in 1/2 hour? select all that apply

Asquare and an equilateral triangle have the same perimeter. each side the triangle is 4 inches longer than each side of the square. what is the perimeter of the square

Monitors manufactured by tsi electronics have life spans that have a normal distribution with a standard deviation of 1800 hours and a mean life span of 20,000 hours. if a monitor is selected at random, find the probability that the life span of the monitor will be more than 17,659 hours. round your answer to four decimal places.