Match each influence to its correct category unhealthful
healthful
A social club organizes a health fair at school.
A social club organizes a bike race after dinner on a school night.

healthful I think! Hope that helped

Healthful - A social club organizes a health fair at school.

Unhealthful - A social club organizes a bike race after dinner on a school night.

Explanation:

People would not feel good biking if they just ate right before the race. The race also might go long so people wouldn't get a good amount of sleep to be prepared for school the next day.

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.