exam Maths Puzzle Numerical Ability

Are the following lines parellel, perpendicular, or neither?

L1 through (-4, -7) and (1, 3)
L2 through (2, 6) and (4, 10)

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exam Other Question

please help
Write each complex number in standard form a + bi showing all work
a)
i^3(i-1)
b)
1-3i/2+i
c) (3+2i)-(1-i)
d)
(1+2i)^2 Find the product or quotient. Write the answer using exponents.

Any help with this problem would be GREATLY</b> appreciated:)