Proofreading of newly-synthesized DNA is important because .A) DNA pol III has a high error rate during replicationB) The cell will invariably die if any mutations occur during replicationC) A high fidelity in the copying of DNA is necessary for good heredityD) Any protein made from mutated DNA will not function properly

D) Any protein made from mutated DNA will not function properly

Explanation: During replication, DNA polymerase double-checks and removes every newly added wrong nucleotide. This is to maintain high fidelity because if a mutated DNA is synthesized during replication, it will also lead to synthesis of an RNA with an altered nucleotide sequence during transcription and consequently lead to the synthesis of a protein that will not function well during translation.

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)