Ratio of red cars to blue cars in the parking lot was 5 to 3 if there are 40 red cars how many blue cars are there

Right ∆abc has coordinates a(-7, 3), b( -7, 10), and c(-1, 3). the triangle is reflected over the x - axis and then reflected again over the y - axis to create ∆a'b'c'. which are the coordinates of vertex a'?