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

Write the function to show a collectable doll that has doubled in value in 10 years. The initial value of the doll was $355.00.
I think the answer is y=355(2)^x/10 . Am I correct Janin deposits $2400 in a bank with 25% reserve requirement.

1. Find the total amount of extra money created through five levels of the multiplier effect.

2. Find the maximu