Negative difference

Find four arithmetic progression members between 7 and -6.

Correct answer:

a2 =  4.4
a3 =  1.8
a4 =  -0.8
a5 =  -3.4

Step-by-step explanation:

a1​=7 a6​=−6  an​ = a1​ + d⋅ (n−1) a6​ = a1​+5d d=5a6​−a1​​=5(−6)−7​=−513​=−253​=−2.6  a2​=a1​+d=7+5−13​=57⋅ 5​+5−13​=535​+5−13​=535+(−13)​=522​=452​=4.4
a3​=a2​+d=522​+5−13​=522+(−13)​=59​=1.8
a4​=a3​+d=59​+5−13​=59+(−13)​=5−4​=−0.8
a5​=a4​+d=5−4​+5−13​=5−4+(−13)​=5−17​=−3.4

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