Ezra leaves a flask of water outside for d days for a science experiment. The number of milliliters of
water in the flask can be modeled using the function w (d) = –30 d + 450.
What is the meaning of the –30 in this function?
A. Each day, the number of milliliters of water in the flask decreases by 30.
B. Each day, the rain adds 30 milliliters of water to the flask.
C. After 30 days, there is no water left in the flask.
D. When Ezra first puts the flask outside, it contains 30 milliliters of water.