Solve using the order of operations (4 x 15) - 3

57

Step-by-step explanation:

57

Step-by-step explanation:

1. Calculate what's in the parentheses first

(4 * 15) = 60

(60) - 3 = ?

2. Exponents (Powers, Roots) before you Multiply, Divide, Add or Subtract

Not applicable for this problem.

3. Multiply or Divide before you Add or Subtract

Not applicable for this problem.

4. For anything else left, just go from left to right

60 - 3 = 57

If you want to remember the shortcut; PEMDAS

P  - Parentheses first

E  - Exponents (Powers and Square Roots, etc.)

MD  - Multiplication and Division (left-to-right)

AS  - Addition and Subtraction (left-to-right)

Remember that:

Divide and Multiply rank equally (and go left to right).

Add and Subtract rank equally (and go left to right)

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.