How do paragraphs 4-6 support the author's purpose? They clarify how to take apart a sand dollar once it has been
properly dried and preserved.
They describe the contributions the sand dollar makes to
the ocean's ecosystem.
They detail the process a sand dollar follows in order to
collect and digest its food.
They emphasize the sand dollar as a treasure by providing
details about its unique characteristics.

nobody can answer this if you dont show us the shapes

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: