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50.0 mL of 1.00 M HCl was combined with 45.0 ml of 1.00 M NaOH solution resulting in a temperature rise of 8.5 C. the specificity gravity and the specific heat of the solution may be assumed to be 1.00 g/mL and 4.18 J/g C respectively. which of the two reactants was limiting? how? what is...

the throttle of a boat is set so the boat would travel exactly 5 feet per second in still water. the boat is on the west bank of the river, which flows south at 4.2 feet per second. the river is 200 feet wide. if the pilot of the boat wants to travel due east across the river he must head the...

i am trying to add values within in a while loop that is within more loops, i the following code works how i want it to, however it adds the total hours from each group to the next groups total hours. how can i fix this? $result = mysql_query("SELECT * FROM employees ") or die(mysql_error())...

im trying to use preg_replace to output the following situations. only letters only numbers only letters and numbers only letters numbers periods and commas im trying also trim all white spaces, i guess i can use trim() unless there is a way i can use regex to trim all down in one function. so...