X^2 + 2x -4= 0
You need to remember one standard result
ax^2 + bx + c= 0

By Comparing the coefficients,
a= 1, b=2, c=-4

Options A ,C
Hello I am sorry to say this but no one can help you because you didn't put a picture of the triangle on.
Answer:
9y+13x
Step-by-step explanation:
9y+3x+4x+6x
9y+13x
Plot 6 directly above 6. Plot root83 between 9 and 10 but nearer to 9 since its value in 3 significant figures is 9.11,
Plot root40 between 6 and 7 but nearer to 6 since its value in 3 significant figures is 6.32,
Plot root64 directly above 8 since 8x8=64,
And lastly plot 7.5 just in between 7 and 8,
Hope this helps ;)