in a lab, a substance was heated by 6 degree C each hour for 12 hours. what was the total change in temperature?

Find and simplify an expression for the area of five rows of x squares with side lengths of x centimeters.

Players on the school soccer team are selling candles to raise money for an upcoming trip. each player has 24 candles to sell. if a player sells 4 candles a profit of$30 is made. if he sells 12 candles a profit of $70 is made

Olga bought a new skirt that cost $20. sales tax is 5%. how much did olga pay, including sales tax? 7.