A number which is now a rattional number is a​

The triangles are similar. what is the value of x? show your work.

Estimate the area under the curve f(x) = 16 - x^2 from x = 0 to x = 3 by using three inscribed (under the curve) rectangles. answer to the nearest integer.

10x − 5y + 14 = 0 whats the answer pls