HSS.IC.B.4 math practice. Learn by doing.

A librarian checked $40$ books selected at random from a collection of $800$ books. She found that $14$ of the books in the sample were fiction. Based on the sample, which of the following is the best estimate of the number of fiction books in the collection?

A ball is tossed upward from a platform. The equation $h = -4.9t^2 + 14t + 21$ represents this situation, where $h$ is the height of the ball above the ground, in meters, $t$ seconds after it is tossed. According to the equation, what is the height, in meters, of the platform from which the ball was tossed?

A stone is thrown upward from the edge of a cliff overlooking a valley. The equation $s = -5t^2 + 11t + 16$ models the stone's height $s$, in meters, above the valley floor $t$ seconds after it is thrown. According to the equation, what is the height, in meters, of the cliff edge above the valley floor?

A football is kicked from a stadium deck. The equation $d = -16t^2 + 48t + 64$ represents this situation, where $d$ is the height of the football above the field, in feet, $t$ seconds after it is kicked. According to the equation, what is the height, in feet, of the deck from which the football was kicked?

A grocer surveyed $25$ customers selected at random and found that $15$ of them purchased at least one organic item. Based on the survey, which of the following is the best estimate of the number of customers out of $500$ who would purchase at least one organic item?

The mass of a chemical sample is modeled by $m(x)=480(0.92)^x$, where $x$ is the number of days after an initial measurement. According to the model, by what percent does the mass of the sample decrease each day?

An online store's weekly visitors are modeled by $v(w)=1{,}250(1.08)^w$, where $w$ is the number of weeks after a launch campaign begins. According to the model, how many visitors does the store have $2$ weeks after the campaign begins?

A cold front is expected to reduce a reservoir's algae volume by $\frac{3}{4}$ of its previous amount each week. The volume is $640$ cubic meters at the start of week $0$. Which equation models the algae volume $A(w)$, in cubic meters, after $w$ weeks?