tan(70)=12cm/y The tangent of the angle equals the opposite over the adjacent
y=12cm/tan(70) Isolate y and plug into calculator
y = 4.4 cm (Rounded to the nearest tenth)
Subtract 9 from both sides. Then you have -14=c/4. Multiply the number by 4. You now have -56=c. :)
Y = 3x + 10
This equation is written in slope intercept form, which is y=mx+b. M equals the slope and b = the y intercept. So in your case, 3 is the slope and 10 is the y intercept.
I don't know what coordinate form is, but I hope that this helped you a little bit.
The prime factors of 18 are 2 times 3 times 3 or you can write it as 2 times 3 squared, this is because and 2 and 3 are both prime numbers