PLease help me find the unit rate for $140 for 18 ft

What is the most accurate measurement of 1 pound

Show your workcan a right triangle have this sides? *how to prove it without using the pythagorean theorema*

Find the volume of the solid whose base is the region bounded by f(x), g(x) and the x-axis on the interval [0, 1], and whose cross-sections perpendicular to the y-axis are squares. your work must show the integral, but you may use your calculator to evaluate it. give 3 decimal places for your answe