Please provide more information.
1) 8v+w+7-8v+2w
=w+7+2w
=3w+7
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2) 4c^2+6c-3c^2-2c-3
=c^2+6c-2c-3
=c^2+4c-3
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3) z^3+5z+3z^2+1-4-2z^2
=z^3+z^2+5z+1-4
=z^3+z^2+5z-3
I'm going to use n instead of t
rⁿ=6.25rⁿ+2
minus rⁿ both sides
0=5.25rⁿ+2
minus 2 both sides
-2=5.25rⁿ
divide both sides by 5.25
-2/5.25=rⁿ
take the nth root of both sides
7 hours and 20 min, hope this helps mark me the brainliest