exam Maths Puzzle Numerical Ability

what is the remainder of 3 to the 98th power divided by 5?

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exam Other Question

the length of a rectangle is 7 feet more than width. if the length were decreased by 3 feet and the width were increased by 2 feet, the perimeter would be 32 feet. Find the length of the original rectangle. 66x^2 + 67x + 10 =0
Solve followig the square root method or the quadratic formula.
Confused on how to work this out any help will be appriciated.