graceaowen
30.07.2021 •
Mathematics
C3. Match the two columns. Column A 1. Magnesium 2. Potassium 3. Gold Column B (i) Occurs in free state (ii) Used to wrap food (iii) Used in fireworks (iv) Used in thermometers (v) Used to galvanize iron (vi) Can be cut with a knife (vii) Occurs in combined form 4. Zinc 5. Aluminium 6. Iron 7. Mercury
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Ответ:
r is 3.
Step-by-step explanation:
Divide both sides by 3 to isolate r squared. Then, take the square on both sides the square root of r squared is r and the square root of 9 is 3. Plug r back into the equation to check if it works. Hope this helps!