2% Of 144.4 is what is what

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'

What is the area of a triangle with vertices at (-3 3) (-3,2) and (1,2)?

The input to the function is x and the output is y. write the function such that x can be a vector (use element-by-element operations). a) use the function to calculate y(-1.5) and y(5). b) use the function to make a plot of the function y(x) for -2 ≤ x ≤ 6.