exam Maths Puzzle Numerical Ability

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Solve the inequality 7< 4x + 3 ? 21

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exam Other Question

I need to multiply the fraction

-3a^2b/35a^5 x 35a^5 / 9b^4=
I have it broken down like this.
7a^2a^3b^2 / 5a^5b^4
please help do I have the right direction? Simplify and write the answer with all exponents positive.

(5c -3power d4power/p-2power)-1power (p7power d-1power/c2power)2power