Solve using vertex it factored form!

Y-int. (0, 65)
Vertex (1.5, 100)
X-int. (4, 0)

When i did the math i got 11 cm

1. 0.3 •4 is the same as 4 groups of 0.32. 7•0.8 is the same as 7 groups of 0.83. it increases by 0.5 every time, so 0.5x4 it increases by 0.9 every time, so 0.9x5. 0.9•12=10.86. 0.47•5=2.35i can finish the next ones in a separate post