allhailkingmilkdud
15.12.2020 •
Chemistry
Which element has 4 energy levels and 7 valence electrons
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Ответ:
Beryllium42
Boron53
Carbon64
Nitrogen75
Ответ:
The circle is centered at (5, −7) and has a radius of 7.
Step-by-step explanation:
The standard form of the equation of a circle with center (a,b) and radius r is given as:
The given equation is
We rewrite to look like the stay form:
We now compare the two equations to get:
a=5, b=-7 and r=7.
Therefore the circle is centered at (5,-7) and has a radius of 7