It would be 7:9 because if you divide each side by 4 then you can get it in simplest form
To multiply fraction do top x top and bottom x bottom
so convert

into

then do
I think you need to retype this one. The formatting makes this question difficult to understand.
C=10, C=90°, B=30°, A+B+C=180°
A+30°+90°=180°⇒A=60°
cos30°=a/c
cos30°=a/10⇒a=cos30°*10
a<span>≃8.6602
c²=a²+b²⇒b²=c²-a²
b²=10²-8.6602²⇒b²=25
b=5
</span>
Answer:
45
Step-by-step explanation:
2/9 = 10/m
m = 10*9/2
m = 90/2
m = 45