exam Maths Puzzle Numerical Ability

Please help. I'm having problems with this.

1) Use the arithmetic sequence of numbers 2, 4, 6, 8, 10… to find the following:
a) What is d, the difference between any 2 terms?

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exam Other Question
Business and Finance. The demand equation for a certain type of printer is given by {{{D=-200p+35,000}}} The supply equation is predicted to be
{{{S = -p^2 +400p-20,000}}} Find th Express as a trigonometric function of one angle sin44cos22-cos44sin22.
(all Numbers are degrees)

a. cos22
b. cos66
c. sin22
d. sin66