Which expression is equivalent to −4.6+(−0.4)+(−7.2) ? −4.6−(0.4+7.2)

−(4.6−0.4)+(−7.2)

(4.6+0.4+7.2)

(4.6+0.4)+(−7.2)

first one −4.6−(0.4+7.2

Step-by-step explanation:

a_n = a_1 + (n - 1)d

the first term is 6.

the common difference d = ?

when you find d, replace n with 7 and d with the common difference to find your answer.