How do you evaluate $(-0.8)+(-7.2)-5.4$ ?

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Answer 1 · 2018-03-06T13:54:08

Rules :- +- is equal to -
. . . . ++ is equal to +
. . . . -+ is equal to -
. . . . -- is equal to +
So - 0.8
. - 7.2
- 5.4 = -13.4

Answer 2 · 2018-03-06T14:06:01

$-13.4$

$color(red)((-0.8)+(-7.2)-5.4)$

$color(blue)(=>-0.8-7.2-0.54)$

$color(magenta)(=>-(0.8+7.2+5.4))$

$color(orange)(=>-(8+5.4))$

$color(brown)(=>-(13.4))$

$color(green)(=>-13.4)$

How do you evaluate (-0.8)+(-7.2)-5.4(-0.8)+(-7.2)-5.4?