Given sin 0 = ā, find cos 0.
✓[?
cos e
=
ө

sin©=⅚

opp=5

hyp=6

using pythagoras rule

hyp²=opp²+adj²

6²=5²+b²

b²=6²-5²

b²=36-25

b²=9

sqr the both side

✓b²=✓9

b=3

cos ©=3/6

=1/2

entering that problem on the tube might get you an answer

3. (5x + 1) - (-10x + 6)

simplify the answer choice. combine like terms. remember to distribute the negative to the terms inside the second parenthesis. also remember that two negatives = one positive, and one of each sign = negative.

- (-10x + 6) = + 10x - 6

simplify. combine like terms:

5x + 1 + 10x - 6

5x + 10x + 1 - 6

15x - 5

∴ it is your answer

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