exam Maths Puzzle Numerical Ability

what is the formula for t subscript n for the following sequence:
100, 98, 94, 86, 70...

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exam Other Question

can I get help with this problem?

2(√y)-(√y-3)=(√5+y)

√= square root
(8x (x to the 2 power) + 8x-2)-(8x (x to 2nd power) +5) = 6x+2. Can you explain..pretty new with computer and math. Going back to school. Im stumped..please help