exam Maths Puzzle Numerical Ability

Write each expression in simplest form.

ab - 3a + 5b - 15/15 + 3a^2 - 5b - a^2b

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exam Other Question

Multiply and simplify.

-3a^2b/35a^5 x 14a^3b^2/-9b^4

I have come up with 2/15b. Is this correct? how do solve problems for inscribed and central angels?