book Maths Puzzle Numerical Ability

I hope I put this under the correct topic.

One recipe calls for 1/4 teaspoon vanilla. A second recipe requires for 1/2 teaspoon vanilla, and a third recipe calls for 1/8 teaspoon vanilla. How much vanilla is required to make all three recipes?

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book Other Question
my question asks to find the length of the diagonal of a rectangle whose length is 8m and width is 5m.
This is what i did:
e^2=8^2+5^2
e^2=64+25
e^2=89
e=9.4
Is this correct? thanks Find the inverse of the function
f(x)=(x-5)^2+4