Exam
Maths Puzzle
Algebra
What is the domain and range of the parabola -14x^2+36x-30=0 ?
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Exam Other Question
The height of a object in feet at time t in seconds is h= 72t-16t^2. When does it hit the ground and what is its maximum height?
A formula of dimonds price is C=am^2, m - is a dimond's mass, a - is a constant number independent of diamond's mass. So the dimond is cut into two pieces.
1. Find a ratio of the masses of those two pieces, when the sum of the prices of these two pieces equals 5/9 of a whole uncut dimond price.
2. What is a ratio of the masses of those two pieces, when the sum of the prices of these two pieces is lowest?