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125+85+22.5+22.5+65=320
320x0.06=9.2
12x10=120
320+19.2+120=459.2
Answer:
second one
Step-by-step explanation:
second one is coordinate plane
Show that n is odd →∃m∈ℤ,n2=8m+1
Let k be an integer so that n=2k+1. Then n2=(2k+1)2=4k2+4k+1=2(2k2+2k)+1.
But this isn't equal to 8m+1, so can I change that into 4(2m)+1?