book Maths Puzzle Numerical Ability

i am less than 100
The sume of my digits is 4
half of me is an odd number

What number am i?

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book Other Question

The perimeter of a rectangle is 50ft. The width of a rectangle is 5ft. less than the length. Find the length and the width of the rectangle. P = 2w +2L Hello to all!

Could someone kindly explain to me clearly, how to find the Vertex and intercepts of:

y = -2x^2 + 8x.

The book's answers are: Vertex(2,8):, intercepts are: