Test has 20 questions how many do you need to answe correctly in order to get 4/5 right

Awater holding tank measures 105 m long, 50 m wide, and 8 m deep. traces of mercury have been found in the tank, with a concen- tration of 60 mg/l. what is the total mass of mercury in the tank? answer in units of kg.

If a 36 inch yardstick casts a 21 foot shadow, how tall is a building whose shadow is 168 feet? what is the scale factor

Rewrite 9 log, x2 in a form that does not use exponents. 9log, x = log, x