exam Maths Puzzle Numerical Ability

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

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exam Other Question

Hi i have a question on a problem on adding rational expressions.

Here it is:
7/2xy^2 + 3/8x^2y

Thanks for helping 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