Question

Which expressions are equal to the expression –16.8 – 4.7? Choose all answers that are correct.
a. –4.7 – 16.8
b. –4.7+16.8
c. –16.8+(–4.7)
d. 16.8 – (–4.7)

Answer 1

$Use\ commutative\ property:a+b=b+a\\\\-16.8-4.7=-16.8+(-4.7)\\\\therefore:\\\\a.\ -4.7-16.8=-4.7+(-16.8)=-16.8+(-4.7)=-16.8-4.7\ CORRECT\\\\b.\ -4.7+16.8\ NOT\\\\c.\ -16.8+(-4.7)=-16.8-4.7\ CORRECT\\\\d.\ 16.8-(-14.7)=16.8+14.7\ NOT$

$Your\ answer:\huge\boxed{a\&c}$