Chemical reactions occur around us every day. Combustion releases the carbon stored in fossil fuels (e. g. coal, oil, natural gases) into the atmosphere as carbon dioxide gas.
Which of the following equations represent this process?
O NaHCO 3 + HC2H302 - NaC 2H 302+H2O + CO2
o CaCO 3 + HNO 3 - Ca(NO3)2 + H2O + CO2
O C&H 10 + 02 – CO 2 + H20
O CO 2 + H20- C6H 1206+ O2

The temperature in gavin's oven is a sinusoidal function of time. gavin sets his oven so that it has a maximum temperature of 280°f and a minimum temperature of 240°. once the temperature hits 280°, it takes 20 minutes before it is 280° again. gavin's cake needs to be in the oven for 30 minutes at temperatures at or above 270°. he puts the cake into the oven when it is at 260° and rising. how long will gavin need to leave the cake in the oven? (round your answer to the nearest minute.)