A pebble is dropped from a bridge into a river. Its height, h meters, above the river t seconds after it is released is modelled by the quadratic function h(t) = 18 – 4.5t. How high is the pebble after 2 seconds?

Prism m and pyramid n have the same base area and the same height. cylinder p and prism q have the same height and the same base perimeter. cone z has the same base area as cylinder y, but its height is three times the height of cylinder y. the figures and have the same volume.