An alloy consists of nickel, zinc, and copper in the ratio 2:7:9. a
How much of each metal is needed to make 3.6 kg of this alloy?

0.4kg, 1.4kg and 1.8kg

Step-by-step explanation:

Given parameters:

         Mass of alloy = 3.6kg

         Ratio of elements in the alloy = 2:7:9

Unknown:

Mass of each element in the alloy = ?

Solution:

To find the mass of each element in the alloy, first find the sum of the ratio;

              2+7+9 = 18

Mass of nickel  = x 3.6 = 0.4kg

Mass of zinc = x 3.6 = 1.4kg

Mass of copper = x 3.6 = 1.8kg

The mass of each metal is 0.4kg, 1.4kg and 1.8kg

step-by-step explanation:

x^2 -12x + 36 + y^2 = 36

x^2 + y^2 = 12x

r^2 = 12rcos(theta)

r = 12 cos(theta)

example 2 – simplify: step 1: completely factor both the numerators and denominators of all fractions. step 2: change the division sign to a multiplication sign and flip (or reciprocate) the fraction after the division sign; essential you need to multiply by the reciprocal. step 3 : cancel or reduce the fractions.