exam Maths Puzzle Numerical Ability

HOW DO U FIND THE SLOPE AND Y-INTERCEPT OF A LINE WRITTEN IN THE Y-FORM?

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exam Other Question

Can someone please help me simplify this expression?
Use trigonometric identities to simplify the expression
(csc theta)(1-cos ^2 theta)(cot theta) Siplify

Could you show work for this one.

3b^2(4b+7)-2b(b^2-5b-3)-6(b-2)

Thanks a bunch