Will give brainliest Please show your work!!! (Please do all of the 21 questions)

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b

The edge of a cube was found to be 30 cm with a possible error in measurement of 0.4 cm. use differentials to estimate the maximum possible error, relative error, and percentage error in computing the volume of the cube and the surface area of the cube. (round your answers to four decimal places.) (a) the volume of the cube maximum possible error cm3 relative error percentage error % (b) the surface area of the cube maximum possible error cm2 relative error percentage error %

3/4 + p = 1/2? i’m not sure how to solve it