Which of the following is most clearly one of Lincoln's purposes for writing this letter to Joshua Speed? A. to help his friend appreciate that Lincoln tolerates slavery in the South even though he hates it
B. to start an argument with his friend over his friend’s support for the expansion of slavery
C. to explain why he finds it necessary to speak out against slavery
D. to persuade his friend to join him in opposing slavery

b I think I not  know pls

the correct answer is c. analytical reasoning. it is when you analyze the situation to form conclusions.

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: