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after number type "^" and power you want to use. For example 2^2 is 2 to the 2nd power.

radius is 9mm, since it is 2 times less than diameter...
circumference is diameter*pi so 18*pi mm. approx. 56,52 mm , but if you need exact answer leave the one with pi

every X coordinate, your graph will go up by 1/2 y coordinate instead of 2.

For instance, y=2x is a graph which has constant slope of 2, while y=x/2 is graph which has constant slope of 1/2. You can use any graphing program to see the difference for yourself

You make an equation : x + 1/7 x = 19
combine terms : 8*x/7=19

multiply both sides by 7 :   8x = 19*7

devide both sides by 8   : x=19*7/8

solve for x :) x = 16.625

nevermind, I solved it lol

should it be an equation?
if you want to rewrite it in different form it would be (x+4)(x-10)

alright, I can't finish it. I don't know where I'm wrong.

alright, I can't finish it. I don't know where I'm wrong.

umm sorry for not finishing the post properly, I'll just post enire question . 

As I said, I'm pretty sure I can do this on my own, I just need a hint on the part I've posted above.

If anyone interested it's from math test to get schoolarship to study natural sciences or math in Japan.