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Each number is -4 times the previous one. That means that you can write a recursive rule as: f(1) = -3 f(n) = -4 * f(n-1) The explicit rule involves powers of -4; you can write it as: f(n) = -3 * (-4)^(n-1)
A function is any rule to assign a value (for example) to a variable "y", depending on the value of variable "x". Such a rule can be written in different ways; in algebra, it is common to write some equation, preferably one that is already solved for "y", such as: y = x2 + 3
3-6 seconds rule = -3
You would write it as [ -5 ] [ 8 ] Where the brackets join up vertically.
Number order in multiplication does not matter, this is known as the associative property. So this means (1*2)*3 = 1*(2*3)