Please help. An element with a mass of 700 grams decays by 6.1% per minute. To the nearest tenth of a minute, how long will it be until there are 220 grams of the element remaining?

Has a picture and need within 5 min

What is the benefit of converting measures in a ratio to the same unit

Jack has a rectangular piece of land, the area of which is represented by a1 = 9.5l. his brother has a different rectangular piece of land, the area of which is represented by a2 = l(14 − l). let a represent the area in square meters and l represent the length in meters of the pieces of land. the two equations plotted on a graph meet at a point as shown in the image