book Maths Puzzle Numerical Ability

simplify the following algebraic expression

Multiply: (2s +5z)^2(s + 3z)^2

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book Other Question

I am asked to find the distance between the verticies of the graphs of f(x)=2(x+4)^2-3 and g(x)= -(x+1)^2-3. According to the form f(x)= a(x-h)^2+k the vertex is (h,k). So the vert Solve:

5 < t - 4 < 6

1 < t < 2

9 < t < 10