Answer:
12.5%
Step-by-step explanation:
sum the parts of the ratio 1 + 3 + 4 = 8 parts
8 parts represents 100%, hence
1 part = = 12.5% ← Andy's percentage of the total
the rate of change is 4/1
communitive
You changed +2 and -x
15 cm²
Area of a triangle = * base * height
Base = 10 cm
Height= 3 cm
Area = * 10cm * 3cm
= 5cm * 3cm
= 15cm²