1. (i) Refer to the planes shown below (labeled (i), (ii), (iii) and (iv)) and choose which of the following statements is correct. (ii) (iv) (a) Each diagram represents a different plane. The four planes belong to the {111} family of planes. (b) Planes (ii) and (iii) are identical. All of the above planes belong to the {111) family of planes. (c) Planes (ii) and (iii) are identical. Planes (i), (ii) and (iii) belong to the {111} family of planes, but (iv) does not. (d) All of the above planes are identical.

Find the measurement that is a) most accurate and b) the most precise. 459 ft; 600 ft; 190 ft.

2. Thermal Efficiency a. Planet Express Generating Station in New York, NY uses 8720 Btu of energy to generate each kilowatt hour of electricity. Find its thermal efficiency. Express as a percentage with no decimal point. b. Mystery Shack Generating Station in Gravity Falls, OR has a thermal efficiency of 43%. How many million cubic feet (MMcf) of natural gas are needed to generate 560 megawatt hours of electricity? Round to the nearest hundredth.

please sovle part (I)  and give me the formulas used in excel  Try to find a result less than 50 for the  question