PLS HELP FAST! Write the first four terms of a decreasing Arithmetic Sequence. Use this to describe, in your own words, how to write both the Recursive and the Explicit Formulas for the sequence. Show how to use the
Recursive Formula to find the next two terms

Write the first five terms of the sequence defined by the recursive formula.

a1=9an=3an−1−20, for n≥2" role="presentation" style="font-family: proxima-nova, sans-serif; -webkit-font-smoothing: subpixel-antialiased; padding: 1px 0px; margin: 0px; font-size: 15.696px; vertical-align: baseline; background: transparent; border: 0px; outline: 0px; display: inline-block; line-height: 0; text-indent: 0px; text-align: left; text-transform: none; font-style: normal; font-weight: normal; letter-spacing: normal; overflow-wrap: normal; word-spacing: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; position: relative;">a1=9an=3an−1−20, for n≥2

The first term is given in the formula. For each subsequent term, we replace \displaystyle {a}_{n - 1}an−1 with the value of the preceding term.

n=1a1=9n=2a2=3a1−20=3(9)−20=27−20=7n=3a3=3a2−20=3(7)−20=21−20=1n=4a4=3a3−20=3(1)−20=3−20=−17n=5a5=3a4−20=3(−17)−20=−51−20=−71" role="presentation" style="font-family: proxima-nova, sans-serif; -webkit-font-smoothing: subpixel-antialiased; padding: 1px 0px; margin: 0px; font-size: 15.696px; vertical-align: baseline; background: transparent; border: 0px; outline: 0px; display: inline-block; line-height: 0; text-indent: 0px; text-align: left; text-transform: none; font-style: normal; font-weight: normal; letter-spacing: normal; overflow-wrap: normal; word-spacing: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; position: relative;">n=1a1=9n=2a2=3a1−20=3(9)−20=27−20=7n=3a3=3a2−20=3(7)−20=21−20=1n=4a4=3a3−20=3(1)−20=3−20=−17n=5a5=3a4−20=3(−17)−20=−51

trapezoid

step-by-step explanation:

first i plotted all my points on a grid graph

i made sure all of them were in the correct quadrant

then i saw it was a trapezoid or a quadrilateral