Wow this is totally confusing, I'm not good with English but I have a few questions for anyone that can help Which of the following is the best thesis sentence?

Pre-school or pre-kindergarten is not required in the United States.

Learning to read in kindergarten

In some countries, children to not start school until they are seven years old.

Putting a child into school before he or she is ready can have negative effects on the child.

Putting a child into school before he or she is ready can have negative effects on the child.

Explanation:

answer: c

explanation:

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation: