book Maths Puzzle Numerical Ability

what are the six ways you can wrte '9 times y" in algebra?

what is the answer to 4+2x5-8?

can you show me how you evaluate if a= -3 and b=2?

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I have problem with this question:
Find the value of sin4A The length of a rectangle is 8 inches more than twice its width. If the perimeter of the rectangle is 28 inches, find the width of the rectangle.