Question

evaluate each expression if x is \\(\frac{2}{5}\\), y is -4, and z is -0.2. express answers in decimal form if necessary.\
a. \\(x + y = \square\\)\
b. \\(2x - z = \square\\)\
c. \\(x + y + z = \square\\)\
d. \\(y \cdot x = \square\\)\
(lesson 5-13)

Explanation:

Part a:

Step1: Convert \( x \) to decimal

\( x = \frac{2}{5} = 0.4 \)

Step2: Add \( x \) and \( y \)

\( x + y = 0.4 + (-4) = 0.4 - 4 = -3.6 \)

Step1: Calculate \( 2x \)

\( 2x = 2\times\frac{2}{5} = \frac{4}{5} = 0.8 \)

Step2: Subtract \( z \) from \( 2x \)

\( 2x - z = 0.8 - (-0.2) = 0.8 + 0.2 = 1.0 \)

Step1: Convert \( x \) to decimal

\( x = \frac{2}{5} = 0.4 \)

Step2: Add \( x \), \( y \), and \( z \)

\( x + y + z = 0.4 + (-4) + (-0.2) = 0.4 - 4 - 0.2 = -3.8 \)

Answer:

\( -3.6 \)

Part b: