Afish tank has a small leak. if there were 20 5/8 gallons in the tank, then 19 7/12 calendars five hours later, how many gallons is the tank losing per hour?

Suppose i flip two identical coins. what is the probability that i get one head and one tail?

What is the number 321,000,000 in scientific notation? also what is the number? ?

Which statements are true? check all that apply. the line x = 0 is perpendicular to the line y = –3. all lines that are parallel to the y-axis are vertical lines. all lines that are perpendicular to the x-axis have a slope of 0. the equation of the line parallel to the x-axis that passes through the point (2, –6) is x = 2. the equation of the line perpendicular to the y-axis that passes through the point (–5, 1) is y = 1.