A alternativa que apresenta o resultado da expressão I(-3)²+ I-5I - I1,2I é? 1 ponto a) 9 b) 13 c) 12,8 d) 2

12.8 (c)

Question:

Is the alternative that presents the result of the expression |(-3)²| + |-5| - |1.2| is? 1 point a) 9 b) 13 c) 12.8 d) 2

Step-by-step explanation:

The absolute value also known as modulus of a real number is the non-negative value of that number without taking into account its sign.

If x is a real number, the absolute value of x is denoted as |x|.

Absolute value simply means to remove any negative sign in front of a number thereby making it a positive number.

When working with numbers in absolute '||', numbers with negative sign become positive when the modulus are removed and numbers with positive sign remains the same. But if the negative sign is outside the modulus, the negative sign remains after the absolute sign is removed.

|(-3)²| = 9

|-5| = 5

- |1.2| = -1.2

|(-3)²| + |-5| - |1.2| = 9 + 5 - 1.2

= 14-1.2 = 12.8

The alternative that presents the result of the expression |(-3)²| + |-5| - |1.2| is 12.8 (c)

4

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.