Which of the following expressions are equivalent to 7.2÷ −8.1 ÷ -3.7?

a)−7.2÷ −8.1÷ −3.7
b)−7.2÷ 8.1÷ 3.7
c)none of the above

step-by-step explanation:

first, eliminate the parenthesis:

3

x

+

2

−

4

x

second, group like terms:

3

x

−

4

x

+

2

third, combine like terms:

(

3

−

4

)

x

+

2

→

−

1

x

+

2

→

−

x

+

2

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

hope it