help I only really need part c thats all but if you guys can help me with the other questions that would be great.

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

If c(x) = 4x – 2 and d(x) = x2 + 5x, what is (cxd)(x)

Find the values of y: 3y^3(y^2+ 2/3y)=0