Don’t understand pleaee help

Me figure out the process to determine x you appreciate it : )

4. a spring scale is constructed so that each 0.10-n increment is separated by 0.50 cm. what spring constant is necessary for the scale to be accurate? -1.0n/cm -0.10n/cm -9.8 n/cm -0.20n/cm

You paint a 1/2 of a wall in 1/4 hour. how long will it take you to paint one wall