Question

done

Answer 1

For #4 you have set up your Pythagorean theorem wrong

Answer 2

AC^2+4^2=10^2

Answer 3

For #5 easiest way I know of is using trig functions, have you learned them?

Answer 4

so for #4 I subtract to find the answer?
#5 yes I have or else I wouldn't even be doing this.

Answer 5

Was just curious because you attempted the Pythag again, it's not needed for this one :-)

tangent = opposite / adjacent.

tan20 = 30 / bc

Answer 6

Ahh I see and sorry I'm a bit cranky today didn't mean to sound rude :] and was I right about #4 needing to subtract instead?

Answer 7

5.
\[30 \cot (20 {}^{\circ})=82.4243 \]

Answer 8

AC^2 + 16 = 100

ac^2 = 84

ac = + or - sqrt(84)