1-Which of the following show the importance of measurement? Select all that apply. Knowing the mileage on a used car you are considering buying Knowing whether an experimental result is useful Knowing who has the biggest piece of pie Knowing your account balance before trying to use your debit card 2-What is the role of equations in this book? Equations are unbreakable laws which nature must follow. Equations describe the true nature of the universe. Equations are abstractions with no relationship to reality. Equations describe the observed relationships between physical quantities. 3- If you were to hold the cardboard pinhole sheet 9 cm above the ground, how big would the image of the Sun appear? Round to two decimal places