exam Maths Puzzle Numerical Ability

Could someone please help me solve and show the work associated:

Question 41
Solve the following expression when x = 4, and y = -3.
2(x-2y)

Question 44
Find: - 8xy(4x2y + 7x - 6y2)
- 12x2 - x2 - 8xy2

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exam Other Question

which logarithmic equation is equivalent to the exponential equation below?

8^x=100

a. x=log8 100

b. x=log100 8

c. 100=logx 8

b. 8=logx 100 � Explain what the value of the discriminant means to the graph of y = ax2 + bx + c Hint: Chose values of a, b and c to create a particular discriminant. Then, graph the correspon