What expression shows the relationship between the value of any term and n, its position in the sequence for the given sequence? 10, 5, 0, -5, -10, a) -5n b) -5n + 15 c) -3n + 15 d) 5n

B

Step-by-step explanation:

These are the terms of an arithmetic sequence with n th term

= + (n - 1)d

where d is the common difference and the first term

here d = - 10 - (- 5) = - 5 - 0 = 0 - 5 = - 5 and = 10, hence

= 10 - 5(n - 1) = 10 - 5n + 5 = 15 - 5n → B

c is the correct answer

step-by-step explanation:

reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.