What is the radius of a circle whose equation is x2 + y2 + 8x – 6y + 21 = 0? units

The radius of the given circle is 2 units.

Step-by-step explanation: We are given to find the radius of a circle with the following equation:

The STANDARD FORM of a circle with centre at the point (h, k) and radius 'r' units is given by

From equation (i), we have

Comparing this standard equation of the circle with the general standard equation (ii), we get

centre, (h, k) = (-4, 3) and radius, r = 2 units.

Thus, the radius of the given circle is 2 units.

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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each  column  of the  table  is called a group. elements in a group share similar properties. groups are  read  from  top  to  bottom. metal. metalloid. nonmetal. solid. liquid. gas. fe. hg. o.  2. 3. 4. 5. 6. 7. 8. 9.  2. beryllium. 9.012. 4.  sodium. 22.990.  11. 3.  magnesium. 24.305.  12.  potassium. 39.098.  19. 4.  calcium. 40.078.  20. i guess  i