Betsy is saving to buy a birdcage. she saves one dollar the first week three dollars the second week nine dollars the third week and so on. how much money will she saved in five weeks

Ill mark the brainliest if you me with the these three questions 7,8,9

1: 4 if the wew 35 surfboards at the beach how many were short boards?

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 %