exam Maths Puzzle Numerical Ability

Y=3x-4 (-3, -5) determine whether the ordered pair is a solution of the given equation. Please help me with this question

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exam Other Question

How many terms are there in each of the following sequences?
a. 51,52,53,54,...,151
c. 10,20,30,40,...,2000
d. 9,13,17,21,25...,353
e. 1,2,4,8,16,32,...,1024
Our problem is how to solve the following optimization problem:
Maximize x'Dx (with regard to x) subject to x'x=1, where D is a known symmetrical (n x n)-matrix and x is unknown (