exam Maths Puzzle Numerical Ability

CAN SOMEONE PLEASE HELP ME WITH THIS PROBLEM:

R(x)= x^3 - 2x^2 - 7 / x^6 - 2x^5 + 6x^2 - 4. How many vertical asymptotes are possible?

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exam Other Question

How many kilograms of water must be evaporated from 50 kg of a 10% salt solution to obtain a 15% salt solution? Please help me with my problem.

use a calculator to tell how many nickles and how many dimes in each problem.
$3.00, the same number of nickels as dimes