Minus 12x both sides
0=5x^2-12x+9
use quadratic formula
for 0=ax^2+bx+c
x=
given
5x^2-12x+9
a=5
b=-12
c=9
remember: i=√-1
The answer should be 12.2
7^2+10^2=c^2
49+100=c^2
149=c^2
12.2=c
40,000 divided by 10 is 4,000
Divide 2 from both sides
t < 5/2
Hope this helps!
