what is the wrong here

(dy/dx=(1+4*t)*sqrt(y)

Answer 1

[Image Analyst]

You never assigned any values to t before you tried to use t. What values do you think/expect/want t to have? You have to assign them to t first.

Answer 2

[Cris LaPierre]

Do you realize your screenshot has nothing to do with the code you've shared?

• You are not using a valid variable name
• Your screenshot shows you are trying to use a variable you have not defined (clearly stated in the red error message)