Question

Evaluate: -4(-1/8 + 0.3) A. - 1.7 B. - 0.7 C. 0.8 D. 2

Answer 1

Hey there! :) 

-4(-1/8 + 0.3)

Simplify this by using the rainbow technique.

(-4 × -1/8) + (-4 × 0.3)

Simplify.

Remember that a negative times a negative is a positive while a positive times a negative is a negative.

(1/2) + (-1.2)

Get rid of parenthesis.

1/2 - 1.2

Change 1.2 into a fraction.

1/2 - 1 2/10

Multiple 1/2 by 5/5 so that both of our fractions have the same denominator.

1/2 · 5/5 = 5/10

So, our new question looks like this :

5/10 - 1 2/10

Change 1 2/10 into an improper fraction.

5/10 - 12/10

Simplify.

-7/10

Change it into a decimal.

-0.7 → b is our final answer :) 

~Hope I helped!~

Answer 2

$-4(- \dfrac{1}{8} + 0.3)$

Rewrite decimal to fraction:
$= -4(- \dfrac{1}{8} + \dfrac{3}{10})$

Change the denominators to be the same:
$= -4(- \dfrac{1 \times 5}{8 \times 5} + \dfrac{3 \times 4}{10 \times 4})$

Simplify each fraction:
$= -4(- \dfrac{5}{40} + \dfrac{12}{40})$

Add the fraction in the bracket:
$= -4( \dfrac{7}{40})$

Multiply:
$= -\dfrac{7}{10}$