exam Maths Puzzle Numerical Ability

Suppose that x and y vary inversely and x=4 when y=7 Write the function that models the inverse variation

a. y+1.75 b. y= 28/x c. y=11/x d. y=3/x

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exam Other Question

What fraction names the shaded part of each of the following figures?

There is a pic of a rectangle split into 7 sections and 3 of the sections are colored red.
would the answer be numerator? Help. Find the constant of variation K.
m varies directly with n; m= 144 when n=8
These are tough!! I appreciate your time!!! McGraw Hill 6th edition,chapter 6 sec. 4, problem # 52. Thanks again!