Pls help me, this is algebra

Enter the number of complex zeros for the polynomial function in the box. f(x) = x+ + 5x² +6

How do you determine whether a relationship represented as as graph is linear or nonlinear

Larger pets need to be transported in larger portable kennels. using a graphing calculator and the relationship between the width, length, and height, find the dimensions of a portable kennel whose volume is 7.4 ft3. the dimensions of a portable kennel can be expressed as width x, length x + 0.4, and height x − 0.2? what are the dimensions of a portable kennel with a volume of 7.4 ft3? use a graphing calculator to solve. round the dimensions to the nearest tenth.