if the xth position in a pattern of number is given by the expression 20-3x then find the 15 th and the 20th terms
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will now list animals that don't have lungs: Phylum Porifera- sponges and Phylum Cnidaria- jellyfish and sea anemones both don't even have respiratory structures like gills or lungs. They are so simple, that their cells do gas exchange individually with the water.
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hy
Step-by-step explanation:
15th Position
=20−3×15
=−25
20th Position
=20−3×20
=−40
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