Mr. lester needs to store 23 science books for his class on a shelf @ the back of the classroom. each science book is 2.6 centimeters thick. if mr. lester stacks the science books on top of each other on the shelf, how tall does the shelf have to be?

The long jump record, in feet, at a particular school can be modeled by f(x) = 19.6 + 2.5ln(x + 1) where x is the number of years since records began to be kept at the school. what is the record for the long jump 11 years after record started being kept? round your answer to the nearest tenth.

Solve the equation 3x2 + 19x + 9 = 0 to the nearest tenth.

Adecorative window is made up of a rectangle with semicircles at either end. the ratio of ad to ab is 3: 2 and ab is 30 inches. what is the ratio of the area of the rectangle to the combined area of the semicircles? possible answers: a. 2: 3 b. 3: 2 c. 6: π d. 9: π e. 30: π