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The summation of negative 5 n minus 1, from n equals 3 to 12 can be
expressed as
n = 3/12
substitute the value of n to the equatio
-5n – 1
-5( 3/12 ) -1
-9/4
Answer:
b
Step-by-step explanation:
The answer is 8 hope this helps all u have to do is figure out what two numbers added togher give you 18
