APPLY YOUR KNOWLEDGE Lakeville High School uses oil and electricity to heat and light the school. The total square footage of the school is 30,000 ft2. The school used 390,000 gallons of oil in 2017 at a cost of $52.00 per barrel. There are 42 gallons in a barrel. The school also used 2,700,000 kWh of electricity at $0.075 per kWh. A. What is the total cost of utilities for the school?

B. Calculate the number of BTU used per square foot per year. There are 150,000 BTU in 1 gallon of oil, and 3,413 BTU per kWh.

C. Calculate the cost per square foot per year for utilities.

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Calculate the ratio of h+ ions to oh– ions at a ph = 7. find the concentration of h+ ions to oh– ions listed in table b of your student guide. then divide the h+ concentration by the oh– concentration. record this calculated ratio in table a of your student guide. compare your approximated and calculated ratios of h+ ions to oh– ions at a ph = 7. are they the same? why or why not? record your comparison in table a. what is the concentration of h+ ions at a ph = 7? mol/l what is the concentration of oh– ions at a ph = 7? mol/l what is the ratio of h+ ions to oh– ions at a ph = 7? : 1

Using data from seismic waves, geologists have learned that earth’s interior is made up of several