Suppose that a is inversely proportional to b. If a = 4 when b = 9, find a when b = -72

   a = ⁻¹/₂  

Step-by-step explanation:

This is a  question on Variation , from the question

a ∞ b , where ∞ is termed the constants of proportionality

Now ,

a = k/b, the first to do here is to calculate the value of the constant k by substituting for a and b in the equation above

4 = k/9

now convert to linear expression by multiplying 4 by 9

k =  36

now to find a when b is -72, we substitute for b in the parent equation above

a = ³⁶/⁻₇₂

a = -¹/₂

answer: a

step-by-step explanation:

10.2 units

.632

step-by-step explanation:

6 * 1/10 = 3/5

3*0.01 = 0.03

3/5 + 0.03 = .63

2*0.002 = .002

.63 + 0.002 = .632